Post Cat O2 Sensor Voltage

I have a 2006 Pontiac Vibe with 132,000 miles. I totally agree with you about the O2 Sensor and VSC/4WD. Yes, Pre cat (AFR) and Post cat (o2) sensor. To verify the o2 sensor works, I switched the two downstream sensors. I am trying to get to the bottom of a p0420 code that appeared after i installed a new downstream oxygen sensor. I checked with the on/off key reading and get code 21. Again, depending upon the switching frequency/rate/interval. p0144 oxygen sensor 3, bank 1 high voltage. The connector not only is the supply for the voltage and grounds, but the source of the needed air supply to the zirconium sensor. If the downstream O2 sensor activity mirrors the upstream O2 sensor, the converter is dead and needs to be replaced. My best guess is it is the computer that is bad. It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Dr. Stating around model year 1999, a new type of converter came on the market, called "Low Oxygen Storage Converter" or LOC. DO NOT REPLACE A CAT ON A VEHICLE TH AT IS NOT IN FUEL CONTROL. If the sensor is not reading correctly it will not set the code. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. 1 one each bank in the front and 1 in the back. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor's voltage produces. Bank 1 Sensor 1 = Upstream (pre-cat) Bank 1 Sensor 2 = Downstream (post-cat) So the SG2 was able to detect the downstream o2 sensor, but no values were detected for the upstream o2 sensor. Since the (ECM) sees a rich signal; it will try to correct with a lean command and try to lower the oxygen sensor high voltage signal. The post cat. If you monitor the voltage on the rear oxygen sensor you will find that it is toggling rapidly approximately 10 to 15 times per minute between. I recently got CEL codes p0136 and p0138 so I changed the rear oxygen sensor. There needs to be a steady 5 volt reference voltage and a very good ground. Technician A says that oxygen sensors can have one, two, three, four, or more wires, depending on the style and design. BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Post cat O2 sensor mix up after downpipes. The front O2 does control fuel mix and if it is getting slow you can count on decreased fuel economy. If you have that the precat sensor is ok and the cat is ok. at light load operation eg. The downstream O2 sensor does not say how the cat is doing, if the catalytic is blocked the O2 sensor will only register a P0420 code. The temperature inside the sensor and the temp of the heating element I think results in the element “eroding” over. When I idle 80% the after cat o2 sensor is lean around 0. 5L) & RS416 (1. if the voltage in the rear o2 starts to move from 0-1vthen most likely your cats are dead. Normally you want the downstream oxygen sensor voltage to be somewhere in the 2. Step 6: Place oxygen sensor removal tool on the old sensor. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. It changes these values pretty quick. Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). If you can't do this easily, try just raising fuel pressure as a temporary test. Joined Apr 26, 2009 · 4,391 Posts. If the PCM determines that the post-cat o2 sensor signal voltage is below a certain threshold for too long, P0157 will set. ScannerDanner 75,467 views. p0147 oxygen sensor 3, bank 1 heater malfunction. The post-catalyst sensor does not suffer this problem because most of the excess fuel and oxygen is consumed in the catalyst. Renamed the CatSim for a reason! This is not a simple Simulator, this is a programmed unit to read the rear o2 sensor voltage and output a conditioned voltage to allow the engine computer to pass all testing related to catalysts, the. Then I learned I had to clear the codes myself. O2 SENSOR B1S1-O2 bank 1 sensor1 in millivolts 21. See full list on obd-codes. When I cruise the after cat of sensor is rich around 0. This, is interpreted by the ECM as a low voltage condition and sets the MIL. 3 PIECE OXYGEN SENSOR SOCKET SET is rated 5. I have a 2000 Sentra with a 1. The rear O2 sensor voltage fluctuates from around a peak of nearly 1 volt at WOT, to nearly 0 on decel. 4l O2 location=downstream, rear, post-cat, sensor 2, cross reference part number=36532rza004, interchange. When I idle 80% the after cat o2 sensor is lean around 0. Using a digi high impedance voltmeter you connect the red lead to o2 sensor signal wire. Would the down stream/post cat sensors play a role in the mixture? Edited February 10, 2014 by chas0218. Different voltages are interpreted as different fuel mixtures. I've been looking at the voltage readings from the o2 sensors on bank 1 (pre-cat) and bank 2 (post-cat) and the voltage from the pre-cat/manifold lambda/o2 sensor fluctuates from 0. The lambda sensor produced a voltage signal of 365 mV. From what I read the pre-cat O2 sensor should be between. If the cat is there and working, it will be almost a flat line, or constant voltage, from the second sensor. If it is the post-cat sensor it should be reading a stable (ish) voltage, as that indicates the cat is doing its job. Sensor environment (damage to the sensor, a leaking exhaust) O2 sensor Bias voltages The computer will send a small bias voltage to the O2 it will be a very weak voltage as it will pass through a resistor inside the computer to drop is current. CaveVan Forum; rpm, o2 voltage, throttle position and I assume the knock sensor reads it as a misfire. The front O2 sensor measures the mixture, and it tells the engine control unit if the engine is running with a rich or lean mixture and adjusts it. This is neither rich nor lean. The rear sensor can be made to alter it's voltage by simply snapping the throttle open and therefore commanding a rich mixture. There needs to be a steady 5 volt reference voltage and a very good ground. The 2005 Nissan shop manual ONLY shows a A/F sensor for the pre cat sensor and a O2 sensor for the post cat sensor. I'm diagnosing an issue, i'm not sure if it is an O2 Sensor or the CAT that requires replacement. Any oxygen sensor that produces higher voltages, is determined to be a wideband oxygen sensor. Anyway, the voltage of the pre-cat sensor is pretty steady at around 2 to 2. If the cat were completely dead, then the post-cat sensor would be sweeping in synch with the front one. o Example 3: A restriction in the fuel return line elevates pressure causing an excessively rich air/fuel ratio and a 20% decrease in fuel economy. then the pollution police stopped that. Signal, Oxygen sensor before Cat. The oxygen sensor upstream of the catalytic converter will normally be referred to as Bank 2 O2 Sensor 1 (B2O2S1) and the downstream oxygen sensor will be Bank 2 O2 Sensor 2 (B2O2S2). In response to the declining NO concentration, the sensor voltage signal decreased to 335 mV. the owner of a 1998 E320 pulled codes P0156 and P0161. If the cat is bad the sensor will probably either bounce around or read rich. I actually replaced bank 2 cat converter with a Walker brand couple years ago when I got the P0430 code and in hindsight I should have replaced the O2 sensor first. 45 Volts on the packaging of the diode, but when I read my downstream O2 voltages, the Bank 1 Sensor 2 voltage appears to have only dropped about a 1/4 of a volt. Check for harness making contact with exhaust components. Cat converter. OBD-II PIDs 9 05 0208 O2 Sensor Monitor Bank 2 Sensor 4 0. 780V pre-modified at idle to about. No voltage, or a very tiny voltage - far below 0. An extremely compact circuit board (. After Catalytic Converter (7) Before Home Chevrolet Silverado 1500 Oxygen Sensor 2004. I am trying to get to the bottom of a p0420 code that appeared after i installed a new downstream oxygen sensor. Bank 1 – Loop status – Pre Cat O2 Sensor – Post Cat O2 sensor – Fuel Trim long term – Fuel trim short term Screen 4 Bank 2 – Loop status - Pre Cat O2 Sensor – Post Cat O2 sensor – Fuel Trim long term – Fuel trim short term Screen 5 Instrument set up – Coolant warning – Tyre coefficient Screen 1. If the catalytic converter is bad, the post-cat oxygen sensor will mirror the post-cat oxygen sensor. Page 2 of 2 - Expected Voltage Post Cat O2 Sensor? - posted in VX220 Discussion: Thanks both, Ill check the resistance/continuity across the white wires at the weekend. it has 3 catalytic converters. The ECU doesn't operate the heater until 35 MPH or thereabouts. Normally Aspirated Powertrain. 8 volts while. If the oxygen sensor fails to switch back and forth or gets stuck. If you have that the precat sensor is ok and the cat is ok. The O2 Sensor will tell the ECM the air-fuel ratio by sending a voltage reading back to the ECM. The voltage range, in most cases, varies between 0. O2 Heating Post Cat Bank 1/2: This shows the oxygen heating value for the post cat sensor on cylinder bank 1. Q-4: Is it alright to drive with a bad oxygen sensor? This is not recommended because you should get it fixed as soon as possible. O2 sensor communicates with ECU and controls the emission and fuel mixtures. Anyway, the voltage of the pre-cat sensor is pretty steady at around 2 to 2. The newest version, software revised December 2018. Can we narrow the field further?. I bought the truck and the check engine light is always on. P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2 P0141 HO2S Heater Circuit Bank 1 Sensor 2 Would this be a bad cat or Rear O2 Sensor. A standard oxygen sensor measures neither oxygen nor fuel content in exhaust gasses. Still no voltage. Page 2 of 2 - Expected Voltage Post Cat O2 Sensor? - posted in VX220 Discussion: Thanks both, Ill check the resistance/continuity across the white wires at the weekend. P0138 - O2 Circuit High Voltage (Bank 1, Sensor 2) This to me meant, Driver's side down stream sensor, and on our truck that sensor is locate basically on top of the cat. I replaced post cat O2 sensor to new Denso O2 sensor. If the PCM determines that the post-cat o2 sensor signal voltage is below a certain threshold for too long, P0157 will set. 4l O2 location=downstream, rear, post-cat, sensor 2, cross reference part number=36532rza004, interchange. Get the best deal for a 1998 Mazda B3000 Oxygen Sensor. The O2 sensor is mounted in the exhaust stream, usually with one sensor not far from the exhaust manifold and one farther down after the catalytic converter. Its using a voltmeter so it seems strange actually that there would be no reading at all, since that in itself is impossible, a voltmeter will say 0v if nothing is applied. hey guys think my O2 sensor on the xr6 is going, getting increased fuel consumption and the cars done a bit over 80 XXXkm's. 90 Volts - Rich mixture) and if the oxygen content is high it produces a low voltage (0. O2 Sensor Delayed Response - Rich to Lean (Bank 2 Sensor 2) Condition for fault identification Test condition: * Determine whether oxygen sensor voltage remains above 649 mV (K_LANK_OBD_S_SA_US). They said was the front one. I have not got the bad cat code since then (over a year now). Now I feel bad, I've seen your other post and wanted to reply that the other faults should have been addressed first before replacing the ETM. Now I feel bad, I've seen your other post and wanted to reply that the other faults should have been addressed first before replacing the ETM. 8L Air Fuel Ratio Oxygen Sensor. Now observe the scan tool bank 2,2 o2 sensor reading. Then, the NO content was reduced stepwise to 10 ppm. On V6 and V8 applications with dual cat exhausts, you'll have upstream O2 sensor readings for each side of the engine and downstream O2 sensor readings for each converter. F40 Model Year: 2019 + Previous Generations; F20 / F21. 01-08-10 03:36 PM - Post# 1838617 In response to Da Burb At one time you could buy them on eBay. Replace the O2 sensor now if you don't want to replace the cat converter sooner. As a test, I erased the DTC code, and then at the primary o2 sensor wire harness, I used a couple of needles to jumper its IG1 cable with the cable on the secondary o2 sensor (If you check the schems both the primary and secondary sensor have a common terminal going to the ACG fuse which provides +12V for the heater circuit) - this resulted in. Post cat o2 sensor! What does it really do for dme? Login Register. 8 are normal. 45 inches) is molded into the end of the connector to provide the most compact and water resistant simulator on the market. They simply wear out or they are ‘abused”, the most common failure mode I’ve seen is that the heating element in the sensor fails. When the oxygen sensors are hot, the O2 sensor becomes a galvanic battery that typically generates a voltage signal between 0. Basically, if the post cat O2 sensor sees the same values as the pre-cat O2 sensor, then the computer thinks the catalytic converter is not doing its job. The higher the number of O2 cross counts, the better the sensor and other parts of the computer control system are working. If, after supplying a ground to the unplugged PCM side of the o2 sensor connector, the voltage reading doesn’t change then check the harness for short to ground. The post-catalyst sensor does not suffer this problem because most of the excess fuel and oxygen is consumed in the catalyst. This lets the PCM 'know' if the post cat is working as it should slowly releasing oxygen. For your vehicle the shape of the sensor probe is the main difference - the. Soot level high, parked regen failed due to not reaching temp. A P0152 code definition:the Bank 2, sensor 1, o2 sensor. Most late model vehicles will be equipped with both a pre-CAT oxygen sensor and a post-CAT oxygen sensor. A O2 running normally will change voltage about 7-8 times in 10 seconds at idle. 2l downstream oxygen o2 sensor 2 post-cat SU7167 please check fitment notes description for accurate information. p0152 oxygen sensor 1. OEM O2 sensor to keep your emissions system running smoothly. As for the rear (downstream) sensor, it only needs to be changed if it throws a code or the Check Engine Light turns on. 3v (lean) and above 0. The post cat sensors are reading 0. Is it to replace WBO2 instead of rear O2 sensor or front one? "Fix the wiring issue", does it mean I can re-layout my rear O2 sensor to the other position? such as move it to central pipe, gain longer measurement point, to prevent transient voltage high issue. Then I learned I had to clear the codes myself. The o2 Sensor you're asking about (Bank 2 Sensor 1) is before the Catalytic. It is as if the circuit between the sensor and computer is not complete. This resulted in excessively rich fuel delivery to bring oxygen sensor voltage back to normal operating range. The O2-I switches back and forth rapidly going from 90MV (Lean) to 900 MV(Rich), this keeps the injectors fine tuned to produce a stoiomechtric 'burn' and keeps the O2 near it's working parameter of. 4l O2 location=downstream, rear, post-cat, sensor 2, cross reference part number=36532rza004, interchange. Why it reads lean at idle?. When I idle 80% the after cat o2 sensor is lean around 0. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. 1 one each bank in the front and 1 in the back. 15v constantly, if I rev the engine it does move, show a bit of small waves to 0. The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level. p0144 oxygen sensor 3, bank 1 high voltage. There is also no tune on the car, it is strictly stock. Does anybody know the location to access the upstream o2 sensor? Thanks, Anthony. Hold the revs above 2500 rpm and check the voltage between ground and the signal voltage you can do this at the sensor or the ECU it dosn't matter as long as there is continunity. Joined Apr 26, 2009 · 4,391 Posts. I bought the truck and the check engine light is always on. On V6 and V8 applications with dual cat exhausts, you'll have upstream O2 sensor readings for each side of the engine and downstream O2 sensor readings for each converter. Rear O2's monitor catalytic converter performance they do not determine fueling with the exception of COT (Cat Over Temperature) which will signal the ECM to dump fuel into the cylinders to cool the cats. 005 Lean to Rich sensor threshold voltage 05 020A O2 Sensor Monitor Bank 3 Sensor 2 0. If it is the post-cat sensor it should be reading a stable (ish) voltage, as that indicates the cat is doing its job. The code is thrown when the post-cat o2 sensors voltage begins to vary, much like the 2 sensors before the cat. Bank 1 Sensor 1 = Upstream (pre-cat) Bank 1 Sensor 2 = Downstream (post-cat) So the SG2 was able to detect the downstream o2 sensor, but no values were detected for the upstream o2 sensor. Free Product Installation Guideline included with the Product and Free Returns for Faulty Products Only. It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Dr. Now I feel bad, I've seen your other post and wanted to reply that the other faults should have been addressed first before replacing the ETM. 02 Corvette Z06 U7198 v1. I bought the truck and the check engine light is always on. Additionally, CODE PO158 is for the O2 sensor AFTER your cat. I got a price from my local ford dealer which was 280odd for the pre cat sensor and 180odd for the post cat sensor. 45 volt mark O2 cross counts. The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level. There's no problem to turning off the rear O2 sensors. The o2 sensor is a four wire sensor. O2 Sensor 1 Voltage Compared to O2 Sensor 2 Voltage by Derry on 10-10-2019 01:30 PM 1998 Mercedes Benz ML 320 Oxygen Sensors Not Working by DeeAnn on 03-28-2019 05:06 PM 1994 Mazda MX3 GS 1. Conv, Bank 2 voltage 1. It shows the period of time the heater. Form: Not sure if the sensor itself is any different but I know the connectors are (at least on the 04's). The bias voltage gets pulled up and down with the signal voltage on a active O2. Post Cat Oxygen Sensor. On a 2014 Chevrolet Silverado 1500 with the 5. then the pollution police stopped that. 4 (both positive values). I've been looking at the voltage readings from the o2 sensors on bank 1 (pre-cat) and bank 2 (post-cat) and the voltage from the pre-cat/manifold lambda/o2 sensor fluctuates from 0. It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Dr. When I cruise the after cat of sensor is rich around 0. Its voltage depends on the amount of oxygen in the exhaust stream. 05 volt readings but does fluctuate between 0 and approx. The car feels fine, and I would happily ignore it, but. the voltage variation in the rear o2 is not enough to tell the dme if you're rich or lean. A O2 running normally will change voltage about 7-8 times in 10 seconds at idle. 5 volts or higher. voltage supply was minimal around 1. Since the oxygen sensor is located in the exhaust stream, it does not directly measure the air or the fuel entering the engine. P0136 - O2 Circuit (Bank 1, Sensor 2) 2. I have a 2006 Pontiac Vibe with 132,000 miles. Different voltages are interpreted as different fuel mixtures. Bought a cheap code reader and pulled code P0138. The upstream oscillate normally. Post Cat O2 Sensor. Aftermarket Value Priced replacement Post-Cat or Downstream O2 Sensors (Lambda Sensor) from HGK / NTK. Post by bubba » Fri Jun 03, 2016 5:21 pm. Welcome to the North American Subaru Impreza Owners Club: Friday August 14, 2020. In fact, those who remove their CAT (not legal for the street) replace their post sensors with a post o2 simulator which puts out a constant voltage to keep the ECU happy - no codes or CEL. Bad sensor codes include ones for sensor slow to respond, bad voltage, heater etc. Manfucturers call this crossing of the 0. 94 "Cat B1 not OK" (<0. However, I've seen this code many times on higher mileage Duratecs and it has always been due to old O2 sensors sending out bad information. If the cat is there and working, it will be almost a flat line, or constant voltage, from the second sensor. Conv, Bank 2 voltage 0. I still have the same problem. If my memory is correct, those are the Bank 1 sensors. 61 P0141 Oxygen sensor heater post-cat (Bank 2) Output. I had to search this forum, as well. it has 3 catalytic converters. M (Power train Control Module) compares the post-cat o2 sensor to the pre-cat o2 sensors to measure the cat's efficiency. O2 sensor voltage. Oxygen sensor voltages. The upstream oscillate normally. 1 V at idle and when driving the car it read 0. The post cat (rear) O2 sensor is a tell tale for the emissions inspections. Post cat O2 sensors feed back 0. 5 volts or higher. 5 and 2) so technically good but on the low side Blocks 036 and 037 for Post-Cat Passed Only other problem I found was Block 046 Cat Coversion test. Active are P0138 -O2 bank 1 sensor 2 high voltage and P2A01. This sensor works very differently than a O2 Sensor, it outputs a steady voltage, it DOES NOT swing rapidly like a O2 Sensor. Also, does it work good? I have a 1994 k1500 with 350ci Thanks. 5v) is sent back to the ecm. If the oxygen sensor fails to switch back and forth or gets stuck. Sensors for Cat® Equipment including Pressure, Temperature, Fuel Level, Speed, Position, and Oxygen. Watch your O2's at that spot. The o2 Sensor you're asking about (Bank 2 Sensor 1) is before the Catalytic. Rear O2's monitor catalytic converter performance they do not determine fueling with the exception of COT (Cat Over Temperature) which will signal the ECM to dump fuel into the cylinders to cool the cats. But as the previous poster noted, the ecu will detect if they are out of range and throw a CEL. 6L) EZ 05-11. The upstream O2 sensor should be constantly changing between a rich/lean condition but the downstream O2 should be more stable with a tendency to a lean mixture. To identify them, the scanner should say something like "Bank 1, sensor 2". If the cat is there and working, it will be almost a flat line, or constant voltage, from the second sensor. 8 volts 8 times in 10 seconds, mine does. Bought a cheap code reader and pulled code P0138. Oxygen Sensor (Downstream or Post–Cat) On OBD II equipped vehicles, one or two additional oxygen sensors are mounted in or behind the catalytic converter to monitor converter efficiency. Reading the manual low voltage is zero volts or im guessing if the sensor wasnt installed would be the same reading as zero volts or no voltage would be reported if the sensor was missing or broken. I checked the voltage of the post cat oxygen sensor it was fluctuating between 0. O2 sensor voltage. Check the harness plugs on the O2 sensors for moisture or corrosion. For 2nd generation MINI Cooper & S models including R56 Hardtop R55 Clubman R57 Convertible R58 Coupe R59 Roadster R60 Countryman R61 Paceman. All O2 sensors are vented to the atmosphere which contains Approximately 21% oxygen. On vehicles where there are multiple converters you will find multiple sensors. If the PCM determines that the post-cat o2 sensor signal voltage is below a certain threshold for too long, P0157 will set. The post cat (rear) O2 sensor is a tell tale for the emissions inspections. If the cat were completely dead, then the post-cat sensor would be sweeping in synch with the front one. If the pre-Cat O2 sensors are bad, they will not be able to sense how Rich or Lean the exhaust gas is and consequently the PCM will not be able to fine tune the fuel injection to meet emission (pollution) standards. The bank refers to the side of the engine. A standard oxygen sensor measures neither oxygen nor fuel content in exhaust gasses. For your vehicle the shape of the sensor probe is the main difference - the. Basically, if the post cat O2 sensor sees the same values as the pre-cat O2 sensor, then the computer thinks the catalytic converter is not doing its job. 3 PIECE OXYGEN SENSOR SOCKET SET is rated 5. The O2 sim has an output signal wire that will replace the O2 sensor's signal wire to the engine control module. for the cat o2 sensor, the car does a check of the scrubbing ability of the cat every now and then. The upstream or pre cat sensor is used for regulating the fuel supply and the downstream or post cat sensor monitors the efficiency of the catalytic converter. When I cruise the after cat of sensor is rich around 0. Then, the NO content was reduced stepwise to 10 ppm. The 1/2 O2 sensor pinout is given on p. Kwiksen 234-4359 Post Oxygen Sensor Downstream 1x L4-2. The bias voltage on the O2 sensor is approx. 0 volts Signal, Oxygen sensor post Cat. You need to use either an analog volt meter or a really fast digital meter. I do not know if Subaru's kick a O2 specific code or it throws O2s, cat other emissions problems into the P0420 code? with that said the front O2 sensor is the main sensor the engine uses, the rear more or less serves as a secondary check. 2 volts indicates a lean mixture and 0. The sensor works in conjunction with an oxygen sensor interface module that is mounted to a sensor bracket located at the rear of the cylinder block above the flywheel housing. Replace the O2 sensor now if you don't want to replace the cat converter sooner. hey guys think my O2 sensor on the xr6 is going, getting increased fuel consumption and the cars done a bit over 80 XXXkm's. 6 with improved performance. your front o2's oscilate (when in closed loop) in the 0-1v range. 15v constantly, if I rev the engine it does move, show a bit of small waves to 0. Im using the torque app on my android and connected it via a BAFX bluetooth OBD-2 scanner. Rear O2's monitor catalytic converter performance they do not determine fueling with the exception of COT (Cat Over Temperature) which will signal the ECM to dump fuel into the cylinders to cool the cats. The function of the oxygen sensors are to determine the amount of free oxygen present in the vehicles exhaust gases. If precat sensor is operating correctly, crosscounts, amplitude, fuel trims, response time and post cat sensor pattern is the same as precat,the problem is inbetween the 2 sensors. It is simple and it worked for me. OBD-II PIDs 9 05 0208 O2 Sensor Monitor Bank 2 Sensor 4 0. Now O2 sensor Sensor 2 is a sin wave from 0. Unless the research tells you otherwise, start with the post Cat sensor. MODE 06 CATALYST CHECKS. That being said, according to the Nissan Shop Manual the correct voltage for the AIR/FUEL RATIO SENSOR should be 1. 8 V shows a richer mixture. Source(s): https://shorte. Perform a check for any fault codes. In case it is not within range, there is either an engine problem (loose hose) or the o2 sensor is bad. For Nissan to go back to an O2 sensor for pre cat would be like going back to vacuum tubes. Now O2 sensor Sensor 2 is a sin wave from 0. Active are P0138 -O2 bank 1 sensor 2 high voltage and P2A01. P0138 - O2 Circuit High Voltage (Bank 1, Sensor 2) 3. It can and likely will lean or rich as the PCM chooses its fuel control strategy. Add some extra fuel to the intake, propane works good, or simply a squirt of gas down a vacuum hose will do. On some newer vehicles, a new type of "wideband" oxygen sensor (also called an "air/fuel. It pointed to P0031 which was Bank 1 Sensor 1 or Top Left Pre Catalytic converter. How to replace pre-cat BMW E46 M3 (O2) sensor DIY Check engine came on found faulty O2 Lambda sensor on my E46 M3 so thought I'd post a few pics to help others. On the M56 the cat is integrated into the exhaust manifold as one unit. 8v per second (mine appear to do that just fine) and the post cat. Normally you want the downstream oxygen sensor voltage to be somewhere in the 2. Its using a voltmeter so it seems strange actually that there would be no reading at all, since that in itself is impossible, a voltmeter will say 0v if nothing is applied. Question: My rear o2 sensor is 2 fixed in 0. This resulted in excessively rich fuel delivery to bring oxygen sensor voltage back to normal operating range. When I cruise the after cat of sensor is rich around 0. Post-cat O2 Sensor Voltage (Bank 1) Post-cat O2 Sensor Voltage (Bank 2) Pre-cat O2 Sensor Voltage (Bank 1) Pre-cat O2 Sensor Voltage (Bank 2) Exhaust VANOS: Actual. 800V That sounds spot on. Blue = front ‘pre’ sensor, Red = rear ‘post’ sensor. Bank 1 Sensor 2 is post cat. I do not know if Subaru's kick a O2 specific code or it throws O2s, cat other emissions problems into the P0420 code? with that said the front O2 sensor is the main sensor the engine uses, the rear more or less serves as a secondary check. Also, does it work good? I have a 1994 k1500 with 350ci Thanks. 8 V6 High NOx and HC Failure by Michael on 02-07-2019 09:51 AM Can I Replace CA Emission Certified CAT with the Federal Version? by Kristy on 09-10-2018 07. This is often normal during a sudden fuel event that the catalytic converter, even when good, cannot instantly clean up. ( Run the engine at 2000 RPM for 1 min. 5L) & RS416 (1. I deeply suspect that there may be issues or up and coming issues that are not yet. Using a digi high impedance voltmeter you connect the red lead to o2 sensor signal wire. Normal condition 0 to 1 V: Driving at 70 km/h (43 mph) This is the output voltage of the heated oxygen sensor (sensor 1). A PTC element inside the oxygen sensor heats up as current passes through it. Left and right sensor positions are found in reference to the rear of the engine (the side opposite of the belts). I checked with the on/off key reading and get code 21. Upstream o2 sensors have no bearing on the code. Still O2 sensor output voltage stuck to 0. The rear sensor have 170,000 miles on them. 000 V (no units): -1. When the voltage begins to vary due to unburnt fuel in the exhaust, it throws a P0420. Watch your O2's at that spot. O2 SENSOR B2S1-O2 bank 2 sensor1 in millivolts 22. Again, spot on. It serves no fuel control purpose. So if the downstream sensor voltage is showing a rich condition (around 600-700 mV), it's very likely that the converter is working. hey guys think my O2 sensor on the xr6 is going, getting increased fuel consumption and the cars done a bit over 80 XXXkm's. M (Power train Control Module) compares the post-cat o2 sensor to the pre-cat o2 sensors to measure the cat's efficiency. It is now clear why the post cat oxygen sensor voltage is high, the vehicle is truly running too rich. 275 Volts 0. Very unlikely that the cat will be damaged. Reply +2 Default Ð Bounty Awarded. Is it to replace WBO2 instead of rear O2 sensor or front one? "Fix the wiring issue", does it mean I can re-layout my rear O2 sensor to the other position? such as move it to central pipe, gain longer measurement point, to prevent transient voltage high issue. P20C4 component G3/11 (left O2 sensor,after CAT,cylinder 7-9) heating,supply voltage (P0161) P20C5 component G3/12 (left O2 sensor,after CAT,cylinder 10-12) heating,supply voltage (P0161) P20C6 G3/11 (left O2 sensor,after CAT,cylinder 7-9),no special condition change P20C7 G3/12 (left O2 sensor,after CAT,cylinder 10-12),no special condition change. I actually replaced bank 2 cat converter with a Walker brand couple years ago when I got the P0430 code and in hindsight I should have replaced the O2 sensor first. The O2 sensor used in most vehicles is a voltage generating sensor. The O2 sensor sends an electric signal directly in proportion to the oxygen content in your vehicle's exhaust stream. That would make the O2 sensor difficult to get to and much more likely that I would ignore it. This test isn't 100% accurate and doesn't account for some fault conditions, but we've found it to be a very reliable indicator of converter health. That being said, according to the Nissan Shop Manual the correct voltage for the AIR/FUEL RATIO SENSOR should be 1. Examine the voltage output from the sensor. O2 SENSOR B1S2-O2 bank 1 sensor 2 in millivolts 23. Caterpillar Engine, Temperature and Pressure Sensor. If the cat is there and working, it will be almost a flat line, or constant voltage, from the second sensor. If it is an O2 sensor, then this is way out of range. Sensor environment (damage to the sensor, a leaking exhaust) O2 sensor Bias voltages The computer will send a small bias voltage to the O2 it will be a very weak voltage as it will pass through a resistor inside the computer to drop is current. 1) p0141-02 sensor heater circuit malfunction (cylinder bank no. I admit I am quite uneducated about the values of these sensors and I learn a bit at a time as I follow these threads. I was told that there is a bypass? for the O2 sensor if you don't have a cat on the truck anymore. Oxygen Sensor (Downstream or Post–Cat) On OBD II equipped vehicles, one or two additional oxygen sensors are mounted in or behind the catalytic converter to monitor converter efficiency. O2 Sensor 1 Voltage Compared to O2 Sensor 2 Voltage by Derry on 10-10-2019 01:30 PM 1998 Mercedes Benz ML 320 Oxygen Sensors Not Working by DeeAnn on 03-28-2019 05:06 PM 1994 Mazda MX3 GS 1. The higher the number of O2 cross counts, the better the sensor and other parts of the computer control system are working. If the cat is there and working, it will be almost a flat line, or constant voltage, from the second sensor. Step 5: Remove the oxygen sensor wire from the clips. The post-catalyst sensor does not suffer this problem because most of the excess fuel and oxygen is consumed in the catalyst. By Mandy Concepcion. It might be a bad O2 sensor or bad wiring. Oxygen sensor voltages. In response to the amount of oxygen found in the exhaust, the oxygen sensors output a voltage which can be read with a multi-meter, oscilloscope, or scan tool. 5 volts and according to the manual it must go below 0. Got a shop to read my Check Engine Light Code for free. There is a post by Robert Powell on another forum where he documents that a bad post cat O2 sensor caused a P0606. 4 v8 and runs well except for a lumpy idle. Q-4: Is it alright to drive with a bad oxygen sensor? This is not recommended because you should get it fixed as soon as possible. The O2 Sensor will tell the ECM the air-fuel ratio by sending a voltage reading back to the ECM. See full list on obd-codes. just wondering how the sensors can distinguish between bank 1 and bank 2 with only 3 sensors. F40 Model Year: 2019 + Previous Generations; F20 / F21. My best guess is it is the computer that is bad. Very unlikely that the cat will be damaged. 935 J cat mentioned O2 sensors and I can tell you from experience the upstream sensors can become lazy to respond. How to replace pre-cat BMW E46 M3 (O2) sensor DIY Check engine came on found faulty O2 Lambda sensor on my E46 M3 so thought I'd post a few pics to help others. 9v while idling. This is neither rich nor lean. The post cat should be fairly constant at around. Why it reads lean at idle?. So steady voltages of. O2 sensor oscillations. A bad sensor is indicated by fluctuating over or under 1 volt for long periods of time or when it is stuck at a certain voltage( i. It drops to 1. Is this normal? Answer: The rear sensor monitors the catalityc converter job. Pre-Cat Oxygen Sensor, Bosch - 550i/650i/750i, X5/X6 50i, X5M/X6M. 27 I called each of them and both of them told me that the post cat sensor. RUN TIME MINS- engine run time is tenths of seconds since last engine start 25. Form: Not sure if the sensor itself is any different but I know the connectors are (at least on the 04's). Those two should fluctuate to set the fuel trim. I have a 2001 toyota sienna 6 cylinder. Both Oxygen sensor and A/F sensor looks alike and have 4 wires in your car but they're different to a trained or experienced eye. BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Post cat O2 sensor mix up after downpipes. On this episode of OBD 4 Everyone we are going to explain and show everything you need to know about the rear o2 sensor AND show you how to use OBD Fusion LI. 8 V6 High NOx and HC Failure by Michael on 02-07-2019 09:51 AM Can I Replace CA Emission Certified CAT with the Federal Version? by Kristy on 09-10-2018 07. The catalyst acts as a homogenizer of fuel mixture so the rich to lean cycling seen pre-cat gets averaged out. Replace the O2 sensor now if you don't want to replace the cat converter sooner. The post converter sensor is a teltale to let the computer the pre cat sensor is functioning. 5 and 2) so technically good but on the low side Blocks 036 and 037 for Post-Cat Passed Only other problem I found was Block 046 Cat Coversion test. The O2 sensor is mounted in the exhaust stream, usually with one sensor not far from the exhaust manifold and one farther down after the catalytic converter. Just do something to get more fuel into the engine and see if the O2 sensor starts to respond or not. the voltage variation in the rear o2 is not enough to tell the dme if you're rich or lean. Basically, if the post cat O2 sensor sees the same values as the pre-cat O2 sensor, then the computer thinks the catalytic converter is not doing its job. It read O2 sensor 1, bank 1. Making the fuel mixture artificially rich by feeding propane into the intake manifold should cause the sensor to respond almost immediately (within 100 milliseconds) and go to maximum (0. Make sure there are no engine problems first, otherwise the new converter will be damaged. I was getting O2 sensor/cat codes. it only has 3 o2 sensors. I checked with the on/off key reading and get code 21. If your car have only O2 sensor its a LEV class vehicle. The front O2 will see that cycling we talked about above around. On OBDII vehicles there are two sensors, one in front of the converter called the pre-cat sensor and one behind the converter called the post-cat sensor. 0L sport, and recently got the (OBDII) P0132 & P0138 codes which are High Voltage Output in sensors 1 & 2. This particular o2 sensor on Bank 2, position 2 is after the converter on bank 2 and monitors the catalyst efficiency of the catalytic converter on that bank. The tip of the sensor, which is inserted into the exhaust, has a bulb that is coated with zirconium ceramic on the inside and a. 271D - Oxygen Sensor Pre Cat Bank 1: Activation 2715 - Oxygen Sensor Heater Pre Cat Bank 2 : Activation 2717 - Oxygen Sensor Heater Post Cat Bank 2 : Activation 2716 - Oxygen Sensor Heater Post Cat Bank 1 : Activation I can't believe all four sensors failed at precisely the same time after I installed the camshaft postion sensor. Post cat o2 sensor! What does it really do for dme? Login Register. Aftermarket Value Priced replacement Post-Cat or Downstream O2 Sensors (Lambda Sensor) from HGK / NTK. When the fuel mixture is rich (less air, more fuel), an O2 sensor produces a high-voltage signal of 0. Testing (O2) Oxygen Sensor Voltage Signals. I tested the sensor via torque app and I see the rear sensor to be at about 0. 90 Volts - Rich mixture) and if the oxygen content is high it produces a low voltage (0. The problem didn't move with the sensor. But as the previous poster noted, the ecu will detect if they are out of range and throw a CEL. 1 per second is normally the minimum, but 2 or more are prefered. See full list on obd-codes. Now O2 sensor Sensor 2 is a sin wave from 0. This proved a correlation between the sensor voltage signal and the NOx content in the case of constant oxygen content. A quick google search suggests maybe a busted O2 sensor but no real impact. The 1/2 O2 sensor pinout is given on p. It will have no effect on fuel mixture. I took it the dealer and paid $80 for them to tell me further diagnosis is necessary sensor is. In case it is not within range, there is either an engine problem (loose hose) or the o2 sensor is bad. For your vehicle the shape of the sensor probe is the main difference - the. Post cat O2 sensors feed back 0. 3)Dual exhaust, four O2 sensors, (OBD II) In this install you would need one more DIY Dual O2 Sensor circuits, hooked up both sides 1 & 2, with one dual pot. For the post cat o2 which you are more concerned with it will read a more steady voltage because the cat should clean up the exhaust. On early OBD II systems, the post-cat O2 sensor should show little or no voltage fluctuations on a scope waveform, since all the mixture fluctuations are being absorbed by the catalytic converter. When I cruise the after cat of sensor is rich around 0. The Oxygen Sensor, also known as the O2 Sensor is the component responsible for delivering exhaust information to a vehicle's emissions computer. If the downstream O2 sensor activity mirrors the upstream O2 sensor, the converter is dead and needs to be replaced. P0138 - O2 Circuit High Voltage (Bank 1, Sensor 2) 3. The post Cat O2 simulator was what we were talking about. The upstream O2 sensor should be constantly changing between a rich/lean condition but the downstream O2 should be more stable with a tendency to a lean mixture. post cat o2 sensor reading. Service manuel does not say which one of the 4 sensor is wrong with code 21 (it only says O2 sensor)and bank 1 only tells me it's driver's side, not if it is front or rear sensor. It is as if the circuit between the sensor and computer is not complete. It's considered okay for the post-cat O2 sensor to read 0. Post cat o2 sensor! What does it really do for dme? Login Register. If precat sensor is operating correctly, crosscounts, amplitude, fuel trims, response time and post cat sensor pattern is the same as precat,the problem is inbetween the 2 sensors. ScannerDanner 75,467 views. rear o2 voltage is usually steady at or about the 500mv range, thats how the dme knows your cat are working properly. 8 volts 8 times in 10 seconds, mine does. No, the post cat sensor will remain a nearly flat line when the engine is a steady speed, if the catalyst is good. The O2 sensor you are referring to is the sensor that is referred to as Air Fuel Ratio sensors (well it is for my car) this is not the sensor i am doing this modification on. This is neither rich nor lean. Normal condition 0 to 1 V: Driving at 70 km/h (43 mph) This is the output voltage of the heated oxygen sensor (sensor 1). The O2 sensor then send back a lean signal, and the PCM increases the on-time of the injectors to make the fuel mixture rich again. The O2 sensor used in most vehicles is a voltage generating sensor. your front o2's oscilate (when in closed loop) in the 0-1v range. The post Cat O2 simulator was what we were talking about. For Nissan to go back to an O2 sensor for pre cat would be like going back to vacuum tubes. The post-cat O2 reading stay steady at around 700mV. Source(s): https://shorte. If it is now at about a half a volt then replace the o2 sensor. O2 sensor is active anytime it is hot enough, but the computer only uses this information in the closed loop mode. 7 O2 Sensor Short Term Fuel Trim (Bank 2 Sensor 2) 0 % (This post was edited by jfls45 on Dec 4, 2011, 1:40 PM). 0L manual trans California/Exhaust. Using scan data and the gas analyzer I can easily confirm the repair. Anyway, the voltage of the pre-cat sensor is pretty steady at around 2 to 2. Just a thought. Find Oxygen Sensors with 0-1 V Voltage Range and Rear post-cat Oxygen Sensor Location and get Free Shipping on Orders Over $99 at Summit Racing!. Disable any code that references the Sensor 2 stuff. The Upstream Oxygen Sensor (Oxygen Sensor 1) Oxygen sensor 1 is the upstream oxygen sensor in relationship to the catalytic converter. sensor must remain with-in a relatively constant voltage range (700 - 800 mV). Again, depending upon the switching frequency/rate/interval. A O2 running normally will change voltage about 7-8 times in 10 seconds at idle. All I could find online were wiring diagrams from a 2001 to 2003 civic, but that is a whole different system (narrow band O2 sensor). Now observe the scan tool bank 2,2 o2 sensor reading. Left and right sensor positions are found in reference to the rear of the engine (the side opposite of the belts). The upstream sensor is used to monitor mixture. For the post cat o2 which you are more concerned with it will read a more steady voltage because the cat should clean up the exhaust. On the M56 the cat is integrated into the exhaust manifold as one unit. At temperatures higher than 620 degrees Fahrenheit, the ceramic cell was capable of transferring oxygen ions from the gas inside of the cell to outside gases, generating an electrical current whose magnitude was dependent on the difference in the oxygen concentration of the. I don't know what you mean replace the sensor. If the PCM determines that the post-cat o2 sensor signal voltage is below a certain threshold for too long, P0157 will set. The front O2 sensor measures the mixture, and it tells the engine control unit if the engine is running with a rich or lean mixture and adjusts it. There is a post by Robert Powell on another forum where he documents that a bad post cat O2 sensor caused a P0606. On this episode of OBD 4 Everyone we are going to explain and show everything you need to know about the rear o2 sensor AND show you how to use OBD Fusion LI. Post by marcjero » Tue Sep 24, 2019 8:07 pm Hi,. Production vehicle/sensors, Constant rpm and Lambda = 1. 8 volts while. O2 voltage remains high with a very slight fluctuation. That average signal (. I went to AutoZone and got an oil drain plug (part# 050-090. Just a thought. The fuel trims are within spec now and the B1S2 HO2S. 2pcs Pre Post Cat for 2005-2008 Pontiac Vibe 1. There is also no tune on the car, it is strictly stock. 9 volts depedning on a/f mixture. With engine running in closed loop the voltage should read over 800mV and lower then 200mV and constantly fluctuate. Hi guys- Steady CEL light popped on a while ago. Hi, I am interested in checking the performance of my O2 sensors both before and after the cat. The O2 Sensor will tell the ECM the air-fuel ratio by sending a voltage reading back to the ECM. Blue = front 'pre' sensor, Red = rear 'post' sensor. The Nernst cell appears to react to something in the exhaust stream with the pump cell reacting to what the Nernst cell does. RUN TIME MINS- engine run time is tenths of seconds since last engine start 25. O2 Sensor 2004 Jeep Grand Cherokee Replacement – Bank 1 Sensor 2, size: 800 x 600 px, source: i. The cat converter consumes nothing. Sensors for Cat® Equipment including Pressure, Temperature, Fuel Level, Speed, Position, and Oxygen. I actually replaced bank 2 cat converter with a Walker brand couple years ago when I got the P0430 code and in hindsight I should have replaced the O2 sensor first. This is the smartest O2 sensor simulator you will find, the only solution. It is as if the circuit between the sensor and computer is not complete. Check and compare both sides. Q-6: Will a bad O2 sensor cause sputtering?. OBD-II PIDs 9 05 0208 O2 Sensor Monitor Bank 2 Sensor 4 0. The centech obd will read voltage from both. The first step in the invention of the O2 sensor occurred in Germany in 1899, when Walter Nernst devised the Nernst cell. Left and right sensor positions are found in reference to the rear of the engine (the side opposite of the belts). The 2005 Nissan shop manual ONLY shows a A/F sensor for the pre cat sensor and a O2 sensor for the post cat sensor. 0L manual trans California/Exhaust. FlagMichael. Year and location of the bike is important in giving definitive advice. The variation of gas and air hitting the sensor should change the voltage output of the O2 Sensor. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor's voltage produces. it fluctuate between 0. A fully warm O2 sensor *will not spend any time at 0. 9 volts depedning on a/f mixture. Did you clear the code after changing the 02 sensor? If not, it will take some time & miles for it to clear on it's own, if the problem was actually resolved by replacing the sensor. AFR looks okay. High O2 sensor voltage does indicate rich. Oct 26 2016 2 Manifold Absolute Pressure MAP Sensor 3 Rear Valve Cover 4 Heated Oxygen Sensor HO2S Bank 1 Sensor 1 5 Engine Coolant Temperature ECT Sensor 6 Heated Oxygen Sensor HO2S Bank 2 Sensor 1 Post sensor pic 2 1 HO2S Bank 1 Sensor 2 Post HO2 Oxygen Sensor Front Bank 1 Front Bank 2 P0132 P0152 range check high sensor signal voltage for. O2 sensors report a voltage to the ecu typically 0 to 1 volt. The ECU basically ignores it until you get into the catalyst monitor test range MPH. However, I've seen this code many times on higher mileage Duratecs and it has always been due to old O2 sensors sending out bad information. If the cat is bad the sensor will probably either bounce around or read rich. You need to use either an analog volt meter or a really fast digital meter. Conv, Bank 1 voltage 0. O2 Sensor 2004 Jeep Grand Cherokee Replacement – Bank 1 Sensor 2, size: 800 x 600 px, source: i. It needs to fluctuate voltage and send that signal back to the computer so the engine can keep the air/fuel ratio in the correct range. Why it reads lean at idle?. Left and right sensor positions are found in reference to the rear of the engine (the side opposite of the belts). The current Federal OBD II warranty period for an oxygen sensor is two years or 24,000 miles, whichever comes first, but with proper care and the right fuel diet, the oxygen sensor should be a. Hi Guys, 2 different shops did reads on my check engine light codes, I even paid $100 for one of them to do a full test of all sensors to identify which one was bad. There are only only two 02 sensors, one behind the engine located in the down-stream pipe and one post cat. Welcome to the North American Subaru Impreza Owners Club: Friday August 14, 2020. The output must cycle at least every two seconds at 2,000 rpm. The downstream sensor is used to monitor the cat function. Pre-Cat Oxygen Sensor, Bosch - 550i/650i/750i, X5/X6 50i, X5M/X6M. The pre-cat (upstream) O2 sensor basically regulates fuel trim. 8L Air Fuel Ratio Oxygen Sensor. It is now clear why the post cat oxygen sensor voltage is high, the vehicle is truly running too rich. There are exceptions though. Those two should fluctuate to set the fuel trim. 6 with improved performance. If it is within this range, the o2 sensor is operating normally and you can stop testing. If the catalytic converter is bad, the post-cat oxygen sensor will mirror the post-cat oxygen sensor. Snap throttle test (Figures 5 & 6). The rear sensor have 170,000 miles on them. I checked it out and seems fine, and I even swapped it out with the known good car. your front o2's oscilate (when in closed loop) in the 0-1v range. The o2 Sensor after the Catalytic is Bank 2 Sensor 2. Check and compare both sides. I bought a FSM online for the 05 TJ and my suspicions were correct the computer on this year controls the voltage to the O2 sensor heaters. Hi guys- Steady CEL light popped on a while ago. 8 my uncle has, it triggered a P0420 code. 5 volts and sometimes higher. Heated oxygen sensor output voltage for sensor 1 Min. It changes these values pretty quick. Fast shipping with low price guarantee. Step 6: Place oxygen sensor removal tool on the old sensor. Most late model vehicles will be equipped with both a pre-CAT oxygen sensor and a post-CAT oxygen sensor. 9 volts depedning on a/f mixture. Normal condition 0 to 1 V: Driving at 70 km/h (43 mph) This is the output voltage of the heated oxygen sensor (sensor 1). DO NOT REPLACE A CAT ON A VEHICLE TH AT IS NOT IN FUEL CONTROL. It is now clear why the post cat oxygen sensor voltage is high, the vehicle is truly running too rich. o2 sensor reading at steady around 0. 5 volts or higher. 1 per second is normally the minimum, but 2 or more are prefered. I have a post-cat O2 sensor which sits on the front of the engine that just stopped sending one day. so consider that when reading my posts. I own a 2000 Wrangler 4. Renamed the CatSim for a reason! This is not a simple Simulator, this is a programmed unit to read the rear o2 sensor voltage and output a conditioned voltage to allow the engine computer to pass all testing related to catalysts, the. Your engine’s computer uses this data to help figure out the current air/fuel ratio, which allows it to maintain fuel efficiency and emissions standards. Check for harness making contact with exhaust components. Günter Bauman. Start the engine and check the sensor voltage signals on your voltmeter. The bias voltage on the O2 sensor is approx.
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