Downstream O2 Sensor Voltage Surging 1500rpm

This tells the computer that the O2 sensor is not producing its own voltage. 3%) and transmits the reading, thru a voltage signal, to the ECU. 11780279 Oxygen control sensor (before catalytic converter) incorrect connection /contact 11780296 Oxygen control sensor (before catalytic converter) Fault code in diagnosis memory (warn. Englewood, CO. 1 volt to as much as 0. Also checked voltage at the connectors with the engine onget 0. Engine run time greater than one minute. I took the o2 sensor off again and power was restored with the loud sound again. The p0132 code is of utter importance for vehicle owners due to the fact that a malfunctioning cylinder leads to a spike in fuel consumption. 6v, the PCM sets the code. Buy products related to downstream o2 sensor products and see what customers say about downstream o2 sensor products on Amazon. Most mechanics will often say it’s the o2 that is shot when it is actually the cat. There's definitely something going on with bank 1, and specifically with the upstream oxygen sensors. It allows you to eliminate the oxygen sensor and remedies CEL issue. like 6MPG so i thought crap I better get that 02 sensor replaced. 0L has the same heater circuit as the 2. code is for the rear O2 sensor. A wideband o2 sensor is much more sophisticated than a narrowband sensor, and can be relied upon to be used as a tuning tool. I did plug the laptop into my God daughter's mom's car, 2003 Ford Focus, and I am getting an active reading on both O2 sensors, so I know that part of Autotap is. The outside air enters through a small gap in the wire insulation and the tested air enters the sensor in the exhaust flow. Order Honda Accord Oxygen Sensor online today. I searched on here and have checked the MAF sensor but with or without the MAF in line doesn't seem to. The Upstream O2 Sensor can adjust the goal voltage to accommodate for slight fuel/air variances. If you have power and control all the way out to the sensor, and still set a heater code, then I'd suggest a faulty O2 sensor. If I held it at 1500 rpm it would do it briefly at first and then stop doing it. As an oxygen sensor ages, the voltage changes get smaller and slower - the voltage change lags behind the change in exhaust gas oxygen. Then, use the scan tool to check the voltage of the O2 sensor to see if it switches properly. Jan 17, 2019 · I've been having recurring issues with my Oxygen sensors on both sides, downstream (after the Cat). Vehicles & accessories; Motor vehicle electronics; Chrysler Powertrain Application 1983-2004. I haven't checked it at the ECU but that's probably a good idea to add to the list. O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Downstream oxygen sensor heating element circuit malfunction. Truck is a '97 Dak CC V6 3. A fault code for an O2 sensor will indicate the sensor location by sensor number (1, 2, 3 or 4) and by cylinder bank (1 or 2). No surging other than a small dip when you stop. A good cat will store O2 and there will be a delay from when you let off throttle and when the downstream O2 sensor shows that lean value. The downstream o2 sensor’s job is to monitor the catalytic converter. anyways the mileage dropped way off. Check the MAF sensor for proper operation P0153 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1) Possible Problems Front oxygen sensor on the passenger's side voltage output is slower than 1 second rich to lean or lean to rich during idling after engine is warmed up (2 trip detection logic). if you google search "nissan code p0430" you will find all the info. When the rear O2 sensor signal reaches approximately 75% of the front O2 sensor signal, a Diagnostic Trouble Code (DTC) will be stored and the MIL will come on. This contamination causes the sensor to lose its ability to produce voltage and send the right signal. It oscillates between the min/max voltage constantly and while it does seem to correlate somewhat with RPM it has many instances where it's just oscillating for no reason. Has your automotive's Oxygen Sensor (also known as a lambda sensor or an O2 Sensor) failed? Then shop at 1A Auto for a high quality Oxygen Sensor replacement for your car, truck, SUV or van, at a great price. The O2 sensor measures the presence of O2 in the exhaust gases, (which under ideal conditions should be about 0. 8 Surge Tank 9 Coolant Temperature Sensor 10 Engine Coolant Temperature Sensor 11 Surge Tank Return Hose DTC P0462 Fuel Level Sensor Low Voltage. Battery voltage greater than 10. Without a scope/DSM/scan tool to see the signal in real time, it is hard to say whether to sensor is working well or not. Once the pipes get hot, the need for extra heat isn't necessary. (So can a bad TPS) and actually all it was was a loose temp sensor wire. Re: Kohler efi 29hp surging issue by Luffydog » Fri Nov 10, 2017 9:41 pm yes that was what I was saying in the first post I made except I put the wrong letters tps yes. A fault code for an O2 sensor will indicate the sensor location by sensor number (1, 2, 3 or 4) and by cylinder bank (1 or 2). 99 escalade~surges at 1500rpm when holding throttle at a steady speed when warm, close loop. PO138 21 Downstream H02S shorted to voltage Harness and connector / Downstream HO2S. The goal of the PCM is to keep O2 voltage moving across the 0. The O2 sensor was disconnected for a long time and it's currently disconnected now. For the o2 sensor issue, if the CEL code is P0136 - P0141 (bank 1 sensor 2), that o2 sensor is as Beefy suggested, is for the down stream o2 only and the PCM will not use that o2 sensor for fuel system management. Downstream O2 sensor voltage drops durring acceleration Normal? - by: Drunken Elvis Well, weirdness continues. My cars check engine light came on and I took my code reader to it and it said po300 code random misfire. O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. I examinjed the other o2 sensors and saw no damage. 3 w/fuel management. If the ECM sees a rich/lean condition it will flash "Open Loop". When the air/fuel mixture is rich (too much fuel) and there is little O2 in the exhaust, the oxygen sensor generates a rich signal (high voltage) typically 0. The ecu monitors the emissions with the O2 sensors and corrects the a/f (air/fuel) mixture to "stoich" which is ~14:1 a/f. Order Honda Accord Oxygen Sensor online today. If you have power and control all the way out to the sensor, and still set a heater code, then I'd suggest a faulty O2 sensor. May 15, 2016 · The pre-cat (upstream) O2 sensor basically regulates fuel trim. Subaru Impreza O2 oxygen sensor bank 1 sensor 2 surging cruise light flashing mil engine light gas Rear Oxygen Sensor P0037 and How To Replace Both O2 Sensors On A Subaru. 2007 Jeep Grand Cherokee 5. P0138 O2 Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2) P0037 O2 Oxygen Sensor Heater Control Circuit Low (Bank 1, Sensor 2) I guess I needed to be a little more specific. Just talked to amedee about my toyota forgot to tell him problem with surging came after replacing o2 sensor - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. 5-volt above battery voltage, check the wiring from alternator to starter relay for breaks or bad connections. The downstream o2 sensor’s job is to monitor the catalytic converter. As soon as you notice your Check Engine Light, poor gas mileage, or an irregular engine idle, book an appointment to have your oxygen sensor replaced. Oxygen sensors, also known as O2 sensors, Lambda sensors, Hego sensors, A/F sensors and AFR sensors, have been fitted to Australian vehicles since the mid 1980s (eg. A Hyundai Accent Oxygen Sensor is a portion of the emissions system and assists with changes in the air/fuel ratio, eliminating the necessity for manual altitude adjustments. Observe the post catalytic converter/downstream O2 sensor signal. (So can a bad TPS) and actually all it was was a loose temp sensor wire. Backprobe the other heater wire, sensor plugged in, and take a voltage reading. I have replaced the TPS sensor, the intake temperature air sensor, and the IAT sensor. so instead of trying to space the sensor out of the pipe, i bought some stainless steel zip ties and i'll try to wrap the sensor to cut the flow down. As an oxygen sensor ages, the voltage changes get smaller and slower - the voltage change lags behind the change in exhaust gas oxygen. This code is indicating the voltage the O2 sensor is detecting is too high. converter is doing it's job. I haven't checked it at the ECU but that's probably a good idea to add to the list. I started researching it and i'm guessing there is too much exhaust flowing passed the sensor. I've been having recurring issues with my Oxygen sensors on both sides, downstream (after the Cat). A Hyundai Accent Oxygen Sensor is a portion of the emissions system and assists with changes in the air/fuel ratio, eliminating the necessity for manual altitude adjustments. If a car has a bad or broken oxygen sensor, this will cause the car to operate less efficiently, causing other problems like the car being difficult to start, its "check engine" warning. a ford dealership said the code is p0030, internal 02 sensor failure. The goal of the PCM is to keep O2 voltage moving across the 0. the dealer is right it can damage your cat but most likly not, but if it the check engine light flashes you need to turn off the car and bring it to the shop becuse that means that it could damage tha cat. FOR BEST RESULTS COMBINE WITH SURGE PERFORMANCE CHIP! FEATURES OF O2 OXYGEN SENSOR POWERCHIP:. O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) What the P0138 code means. that means it switches at a narrow frequency bandwidth, in the micro second range. It will be in within the next few days. It seems to hunt between 600 rpm-1500 rpm about every 2 seconds. I had thought - absent a vacuum leak (intake tract leak) - and please note that I have NOT ruled that out - then, essentially if the upstream O2 sensor was healthy - mebe it'd be MAP sensor, TPS, IAT, or Coolant Temp sensors - one of them, say, that was out that would cause horrible lean-surge once beyond closed. I have an ORP with a MIL eliminator and I recently got a check engine light. The operation of injection / ignition system is significantly determined by the voltage of the oxygen sensor, therefore when the chip modifies this signal we may regulate effectively engine output. (Upstream) O2 sensor voltage. 1978 Schwin Cruiser with a flower seat. This type of sensor allows more precise monitoring and correction of the fuel mixture than was possible with conventional O2 sensors, and may receive more widespread use in the future. The post cat sensor is a cat performance sensor, so it checks to make sure the catalytic converter is working properly. The oxygen sensor (previously called the "lambda sensor") monitors the level of oxygen (O2) in the exhaust so that the ECU can regulate the air/fuel mixture to reduce emissions. I did read when certain codes set it stops the ECM from further self diagnostics until that code is fixed, I believe the case I read about was an AF Sensor code and thus no other emissions self test would be. Question 1 What do oxygen sensors do, and where are they located on my customer's vehicle? Answer Based on the oxygen content of the exhaust gas, the oxygen sensor located upstream of the catalytic converter sends a signal to the engine control unit (ECM), which adjusts the air/fuel mixture to the optimal level. I had to Google the sensor to find the location and was surprised to see it is so close to the primary. Bank 1 sensor 1 is the primary O2 sensor that should be located on the header. lamp on) 11780299 Oxygen control sensor (before catalytic converter) Fault code stored in diagnosis fault code memory. Measuring the O2 sensor. An open sensor circuit or cold sensor (below 300C) causes an open loop. RIGHT DOWNSTREAM O2 SENSOR STAYS AT CENTER DTC sets if right downstream O2 sensor signal voltage stays. Overview & Testing; "This measures the temperature of the air entering the engine. Replace the oxygen sensor Replace the power control module (PCM), in the rare case that it is necessary Searches related to P0155 - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1. I had thought - absent a vacuum leak (intake tract leak) - and please note that I have NOT ruled that out - then, essentially if the upstream O2 sensor was healthy - mebe it'd be MAP sensor, TPS, IAT, or Coolant Temp sensors - one of them, say, that was out that would cause horrible lean-surge once beyond closed. Above 1500 rpm, it should. I hooked the tool to my wife's car ('99 Ford Escort) and the sensors seem to be in order (bank 1 sensor 1, bank 1 sensor 2). My O2 sensor no activity code has now changed to O2 high voltage (P0132). Rear heated oxygen sensor is located downstream of the warm-up three way catalyst. The car will surge forward with power then the surge stops, but it feels like it is lagging, then the power d surge again. As a matter of fact it ran better with the old sensor in it and also when I didn't get the O2 connectors locked in place the other day. As well, there should be Upstream and Down stream O2 sensors, the downstream O2 sensors are there to test the Catalytic Convertors. In response to the declining NO concentration, the sensor voltage signal decreased to 335 mV. There are probably threads/videos on how to calibrate the throttle position sensor. When Car first goes into closed loop I see both down steam O2 switch about the same level of voltage but I believe the Bank 2 downstream O2 gets more sluggish after the heater circuit is turned off, so my next step I think after he comes back with a replacement downstream O2 sensor is maybe check if the left bank cat is reaching as high of a. Slow signal of precat exhaust o2 sensor may prevent the post oxygen sensor emulator from working. this is on the starboard engine. Aug 23, 2011 · The downstream oxygen sensor is there only for emissions purposes. An O2 only commands the computer to go lean or rich on the fuel, depending on what it reads, but won't cause a car to surge at idle. The computer evaluates and compares signals from the upstream and downstream sensors to assess whether the cat. When the oxygen sensor gets hot, it produces a voltage signal between the in and out platinum electrodes due to the difference in oxygen levels. Once the O2 sensor is heated up, it will override this voltage. O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. if you google search "nissan code p0430" you will find all the info. Symptoms of a BAD Oxygen Sensor. They ran a diagnostic test on my Subaru and it reported that there was an issue with the O2 Bank 1 Sensor 1. Took it to Auto Zone and it said bank 1 o2 sensor. anyways the mileage dropped way off. exact same problem, I have cleaned the throttle body, fuel injectors and MAF Sensor, changed a broken intake manifold gasket, replaced the IAC, PCV, and EGR valves, and it STILL does it. If the ECM sees a rich/lean condition it will flash "Open Loop". An easy way to do this is to disconnect the UEGO sensor from the UEGO gauge. I won't go into how it does it as you may have read about it anyway. o2 sensor is new and all new gaskets from TB to exhaust. It allows you to eliminate the oxygen sensor and remedies CEL issue. po137 is o2 sensor circuit low volts (bank 1 sensor 2) in English means o2 sensor is not seeing the right temperature thru the catalytic converter. If the sensor detects a lean condition, the ECU increases the injector pulse width to compensate and vice versa. What is an Oxygen Sensor? Functioning like a monitor, your oxygen sensor works like this: the O2 sensor tip is located inside of your exhaust pipe, the oxygen sensor detects the percentage of oxygen in the exhaust. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. There are probably threads/videos on how to calibrate the throttle position sensor. Everything works including the OBDII sensor. 5 volts) and 415 Deg F. Catalytic Converters & O2 Sensors Download PDF. To verify the o2 sensor works, I switched the two downstream sensors. Free Same Day Store Pickup. Real sensors go over 1. 25 is the more normal setting for downstream sensors. The code it is displaying is P0138 - O2 Sensor High Voltage Bank 1, Sensor 2. com FREE DELIVERY possible on eligible purchases. P0175/2 are running rich codes, probably caused by your shitty o2 sensor. lamp on) 11780299 Oxygen control sensor (before catalytic converter) Fault code stored in diagnosis fault code memory. When the air/fuel mixture is rich (too much fuel) and there is little O2 in the exhaust, the oxygen sensor generates a rich signal (high voltage) typically 0. from the sensors. 5 and the wiring to the downstream o2 sensor melted the wiring coming off the car is a red/yellow. You have 4 wires I think to your O2 sensor. The upstream sensor is really lazy, but not bad enough to trigger a DTC. Can anyone help what are normal voltages for the downstream O2 sensor. so instead of trying to space the sensor out of the pipe, i bought some stainless steel zip ties and i'll try to wrap the sensor to cut the flow down. It oscillates between the min/max voltage constantly and while it does seem to correlate somewhat with RPM it has many instances where it's just oscillating for no reason. I also priced the upstream O2 sensor, $240, money that I dont want to have to spend. By monitoring the voltage output of the O2 sensor, the ECM will know what fuel mixture command to give to the injector. At a step S601, it is determined whether or not the downstream O2 sensor output voltage RVO2 is lower than a reference value RVREF (e. You should see some kind of pulse width modulated ground, which you can also verify with a test light connected to B+. Check out free battery charging and engine diagnostic testing while you are in store. As an oxygen sensor ages, the voltage changes get smaller and slower - the voltage change lags behind the change in exhaust gas oxygen. My Bank 1 cat drops down to lean right away where as my bank 2 cat had a second or two delay. One side of the O2 sensor's sensing element is exposed to the exhaust stream and the other side to the outside air. When Car first goes into closed loop I see both down steam O2 switch about the same level of voltage but I believe the Bank 2 downstream O2 gets more sluggish after the heater circuit is turned off, so my next step I think after he comes back with a replacement downstream O2 sensor is maybe check if the left bank cat is reaching as high of a. 0L SUV can be tested, and in this article, I'll show you how in a step-by-step fashion. I am getting the codes above, and need to know which one is Bank 1, Sensor 2 specifically. However I had a cituation similar I burped my coolant sys because that can make it surge. Our o2 sensor near the firewall was recently replaced under code p0130, the check engine went on twice within 3 months at 52K and was covered under extended warranty. The Downstream O2 Sensor is considered to be protected from extreme environments by the catalyst (but don't count on it). Ram Upstream Oxygen Sensor Goal Voltage From Star Center News #5, February 2000 - tests for those who have access to OBD II or OBD III code readers. Bad HO2 sensor<= Most likely Check and fix any exhaust leaks. When in this state, the UEGO gauge will output 2. The sensors were first installed in vehicles in the 1970s, when the Environmental Protection Agency introduced exhaust regulations. Since the introduction of OBDII with both upstream and downstream O2 sensors, the downstream O2 sensor has been used to evaluate catalytic converter operation and to control converter efficiency. The idle surges up and down. I too plan on getting the Zard exhaust and a power commander eventually to eliminate this crap altogether. Just talked to amedee about my toyota forgot to tell him problem with surging came after replacing o2 sensor - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. A P0141 is a heater circuit malfunction on the downstream O2 sensor - the ECU is either sensing insufficient or excessive current flow in the O2 heater circuit. I took my old headers and midpipes off of the car and this one O2 sensor took me 3 days to remove. com and sparkplugs. If the ECM sees a rich/lean condition it will flash "Open Loop". 1 is usually the one in the exhaust manifold, while sensor No. The pre-cat (upstream) O2 sensor basically regulates fuel trim. I'm at a loss here, would appreciate any help. The post cat sensor is a cat performance sensor, so it checks to make sure the catalytic converter is working properly. This happened prior to the Hptuners release so its not related. 18 months ago. Show a large voltage drop (5 volts) and -40 Deg F. Order Honda Accord Oxygen Sensor online today. I have an ORP with a MIL eliminator and I recently got a check engine light. After start-up, and after. O2 sensors have heating elements in them that are activated by a relay. Just talked to amedee about my toyota forgot to tell him problem with surging came after replacing o2 sensor - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. I can notice it in all gears as long as my foot is constant on the pedal. I'm looking for some answers. Just talked to amedee about my toyota forgot to tell him problem with surging came after replacing o2 sensor - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. When the computer receives a rich signal (high voltage) from the O2 sensor, it leans the fuel mixture to reduce the sensor’s reading. Above 1500 rpm, it should. frontair fuel sensor has to work flawlessly. Report back to us with the correct code number. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Preserves smog certification. What you will need. The downstream oxygen sensor is there only for emissions purposes. The signal from the O2 sensor upstream from the monitored catalyst and the associated monitoring oxygen sensor downstream from the catalyst are used to estimate the Oxygen storage capability: If a catalyst has good conversion properties, the oxygen fluctuations upstream from the catalyst, generated by the lambda controller, are smoothed by the. The ECM uses the signal from the front and the rear oxygen sensors to control the engine operation and to monitor the performance of the catalytic converter, which is a major part of the vehicle's. Free Same Day Store Pickup. A car stalls when at idle. If voltage stays at 5 volts, this DTC will set indicating no activities. Surging is among the many problems a failing O2 sensor can cause, but it isn't the only one. My son's fiance said that leaving work last week, she could hardly get the truck to go 35mph, it was misfiring so bad (naturally, my scanner was in a different vehicle at the time). The sensor must have voltage and ground to produce a signal, so check these terminals first with an analog voltmeter. o2 sensor connected The o2 sensor is in the circuit so your test is the same as ecm mode 2 test. Page 2- Failing O2 sensor symptoms? Normally Aspirated Powertrain. Downstream oxygen sensor input voltage maintained above the normal operating range. It doesn't hurt if the total voltage goes above 1. The ECM uses the signal from the front and the rear oxygen sensors to control the engine operation and to monitor the performance of the catalytic converter, which is a major part of the vehicle's. Jul 08, 2018 · Adjust the synch crossover cable to balance the mercury at 1500 RPM (just barely off idle). Bank 2 is radiator side. 48v when the throttle is closed. That is a voltage produced or derived, since it actually comes from the vehicle's power system within the computer and is fed through a very high resistance to the O2 sensor circuit. 52 volt during the trip. At an standstill, it's never. I searched on here and have checked the MAF sensor but with or without the MAF in line doesn't seem to. 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. o2 sensor is new and all new gaskets from TB to exhaust. anyways the mileage dropped way off. done it again, but while driving, at any. Since the introduction of OBDII with both upstream and downstream O2 sensors, the downstream O2 sensor has been used to evaluate catalytic converter operation and to control converter efficiency. Remember, a digital voltmeter will average a changing voltage Here's a tip: the newer the sensor, the more the voltage changes, swinging from as low as 0. idle 1500rpm: STFT -3. Dec 13, 2006 · PO138 21 Downstream H02S shorted to voltage Harness and connector / Downstream HO2S. It seems to hunt between 600 rpm-1500 rpm about every 2 seconds. Whether a part big or small, fixing your car or truck with top quality parts is the best strategy every single time. I started researching it and i'm guessing there is too much exhaust flowing passed the sensor. I had been putting it off As I didnt notice a bad drop in mileage and the sensor is about 75. Since then my car is surging at idle. i finally got them to say bank 1 sensor 1. Battery voltage greater than 10. Why do CA cars have 2 sensors, and if the "upstream" sensor is new, could the surge, (only while coasting between 900-1500 rpms) be caused by the 2nd sensor? EGR valve is basically for recirculating exhaust gas on start up only , isn't it?. The downstream o2 sensor is located just past the catalytic converter in the exhaust manifold. 2004 Black Dodge Ram 3500. Quick question about the Up-stream O2 sensor though, when I'm driving and release the gas fully, the voltage for the front O2 sensor drops to 0 and remains for awhile. Check out free battery charging and engine diagnostic testing while you are in store. Just talked to amedee about my toyota forgot to tell him problem with surging came after replacing o2 sensor - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. A car stalls when at idle. Rechecked the resistance at the rear O2 again, and that is within spec. A fault code for an O2 sensor will indicate the sensor location by sensor number (1, 2, 3 or 4) and by cylinder bank (1 or 2). 11780279 Oxygen control sensor (before catalytic converter) incorrect connection /contact 11780296 Oxygen control sensor (before catalytic converter) Fault code in diagnosis memory (warn. When the computer receives a rich signal (high voltage) from the O2 sensor, it leans the fuel mixture to reduce the sensor’s reading. When the air/fuel mixture is rich (too much fuel) and there is little O2 in the exhaust, the oxygen sensor generates a rich signal (high voltage) typically 0. 8 Surge Tank 9 Coolant Temperature Sensor 10 Engine Coolant Temperature Sensor 11 Surge Tank Return Hose DTC P0462 Fuel Level Sensor Low Voltage. This code is triggered by the first downstream (front) O2 sensor. I just did this exact test on a Lincoln LS last week that came in with a P0420 code in the PCM, and the downstream O2 sensor on bank one was exactly matching the upstream sensor. Bank 1 is passenger side, sensor 2 is the downstream sensor, post catalytic converter. Start by getting the car up on some safety stands, then roll underneath it with a. Place one probe on sensor wire and one probe on ground. Jan 25, 2007 · How do you test an O2 sensor? Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. When the engine is started cold, there are four primary inputs into the computer. Our o2 sensor near the firewall was recently replaced under code p0130, the check engine went on twice within 3 months at 52K and was covered under extended warranty. O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) What the P0138 code means. Ok so just put in a brand new mass air flow sensor and it still coding out po102 which is low mass air flow current. The voltage will drop a bit at idle and raise a little when running but should always be stable and not varying like the front sensor. I did a partial 60k tune-up this past Nov. PO138 21 Downstream H02S shorted to voltage Harness and connector / Downstream HO2S. What would cause the mass air flow sensor constantly put out low input 43 Answers. Jan 06, 2012 · This sensor has 5v supplied to it (Voltage Reference (VREF) is a conditioned regulated constant 5v DC power source supplied by the PCM}, and returns a signal voltage based on temperature. A defective O2 sensor would likely be sending a constant 1. CASE 1: The multimeter registered the indicated voltages-This test result lets you know that the MAF sensor is working OK and has not failed. For the downstream sensor, you will find it easier to access the O2 sensor from underneath the car. By the way it has the 5. With the Engine Coolant Temperature sensor above 70°C (158°F). Cars that have a faulty oxygen sensor will commonly have a poor idle, jerk erratically at a steady throttle or emit a rotten egg odor from the exhaust pipe. Remember, a digital voltmeter will average a changing voltage Here's a tip: the newer the sensor, the more the voltage changes, swinging from as low as 0. An oxygen sensor gone bad impacts your car's engine performance. Driveability has gone to crap. The rear o2 sensors are for diagnostic purposes, simply to tell you if the cat is working or not. You need catalytic converters back to fix this problem. Upstream oxygen sensor heating element circuit malfunction. Veronica Perez, P0132: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)means that your problem pertains to your o2 sensor circuit. As a matter of fact it ran better with the old sensor in it and also when I didn't get the O2 connectors locked in place the other day. Can anyone help what are normal voltages for the downstream O2 sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time. Ok so just put in a brand new mass air flow sensor and it still coding out po102 which is low mass air flow current. I checked with the on/off key reading and get code 21. When extra air is introduced into the engine, the sensor's voltage output should drop to 0. The P0171 is one of the more common trouble codes. DOWNSTREAM VOLTAGES: With the catalytic converter at operating temperature, downstream voltages normally report in a range of 600-700 millivolts (mV). Subaru Impreza O2 oxygen sensor bank 1 sensor 2 surging cruise light flashing mil engine light gas Rear Oxygen Sensor P0037 and How To Replace Both O2 Sensors On A Subaru. Even if the switching characteristics of the front heated oxygen sensor shift, the air-fuel ratio is controlled to stoichiometric by the. Check to see if the O2 sensor responds correctly to rich and lean fuel conditions. 11780279 Oxygen control sensor (before catalytic converter) incorrect connection /contact 11780296 Oxygen control sensor (before catalytic converter) Fault code in diagnosis memory (warn. If you could monitor the front o2 and the rear o2 of bank one you might see two sensors acting the same to each other. Surging is among the many problems a failing O2 sensor can cause, but it isn't the only one. What is odd to me is when at idle for 5 mins I could not get the Bank 1 O2 sensor to drop down to low voltage again. If voltage from this sensor reads above 4. I even did my novice-MPG trials with with the bad O2sensor. All torque down to factory specs. The signal from the O2 sensor upstream from the monitored catalyst and the associated monitoring oxygen sensor downstream from the catalyst are used to estimate the Oxygen storage capability: If a catalyst has good conversion properties, the oxygen fluctuations upstream from the catalyst, generated by the lambda controller, are smoothed by the. A wideband o2 sensor is much more sophisticated than a narrowband sensor, and can be relied upon to be used as a tuning tool. i finally got them to say bank 1 sensor 1. If the ECM sees a rich/lean condition it will flash "Open Loop". Check fuses, connectors and wiring in the O2 sensor heater circuit before blindly replacing the sensor - any of those can also cause the code. I compared to the port engine and the range is 0. 4L car (pick up, SUV) is not that hard to do. The voltage signal from the sensor may range from as low as 0. 8V I expect to get a new OBD reader in a couple of days and presumably will be able to provide more comprehensive data In addition to the P0171 I'm getting P450. Typically an IAC motor that's going bad would give you problems when it's cold, not just the motor but outside temp, but yours gets worse when hot. As an oxygen sensor ages, the voltage changes get smaller and slower - the voltage change lags behind the change in exhaust gas oxygen. I took the o2 sensor off again and power was restored with the loud sound again. Not sure if there is a tune on it, but doubt it. All torque down to factory specs. Without a scope/DSM/scan tool to see the signal in real time, it is hard to say whether to sensor is working well or not. Oxygen sensor failure can often be traced to one of three common factors: Age and high mileage, an internal contaminant (poisoning) or an electrical issue. Our o2 sensor near the firewall was recently replaced under code p0130, the check engine went on twice within 3 months at 52K and was covered under extended warranty. I replaced my A/F Ratio sensor (pre-cat o2) about 2 years ago after getting the code for "02 sensor Bank 1 Sensor 1" with a direct fit Ngk/Ntk sensor I bought off ebay. 5mm free play, then adjust either for correct synch) Reset throttle cable free play at. May 29, 2019 · The procedure is the same for the downstream O2 sensor (Bank 1 Sensor 2). I've been having recurring issues with my Oxygen sensors on both sides, downstream (after the Cat). • The rear panel is different. I did read when certain codes set it stops the ECM from further self diagnostics until that code is fixed, I believe the case I read about was an AF Sensor code and thus no other emissions self test would be. So that's completely in the normal range. Normally, your computer will throw a check-engine light and an O2 sensor failure code when the sensor gets bad enough to surge. This sensor measures the pollutants making it through the converter and out of the tailpipe. (try all) and measure at 1500 rpm. I am getting the codes above, and need to know which one is Bank 1, Sensor 2 specifically. 7l throttle body fuel injection. O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) What the P0138 code means. I also priced the upstream O2 sensor, $240, money that I dont want to have to spend. Also, surging is felt because during closed loop operation the mixture is being moved back and forth in the range between the 'best power' and 'best efficiency. The ground voltage should give you 0. what could it be? Dash lights stay on. Hi I'm new to the form so sorry if I'm posting in the wrong spot but I'm having a lot of trouble with wiring my down stream o2 sensor the guy I bought it from replaced the motor with a junkyard 2. Soaked it with Kroil. Ran the engine at idle to heat up the exhaust pipe. Can anyone help what are normal voltages for the downstream O2 sensor. So you're getting O2 sensor errors and cylinder-5 misfires logged. The O2 bung is tig welded through the water jacket and into the, hopefully hot, exhaust flow. It will be in within the next few days. right side from driver seat POV) for "High Voltage error" or something along those lines. Jun 30, 2016 · The rest of the exhaust is stock and the cats/O2 sensors are there. I know where the sensor 2 is but where is the bank 1 for my 1999 subaru forrester code PO 141 O2 sensor heater bank1 sensor 2? For 1999 Subaru Truck Forester AWD 2.