Figure 4 shows typical results on the response of the four types of heated exhaust gas oxygen sensors in H2/O2/N2 mixtures, all with a sensor heater voltage of 14. The upstream before cat (Bank1Sensor1)sensor voltage will read +-450millivolts it changing at a fast rate. I feel the best setup is to have the display values in percent and the graph in voltage (not setup here). went out the next day and bought a another sensor for bank 1 sensor 1. Subaru Check Engine Light and Code # P0420 Explained By Justin Stobb on January 18, 2011 in All Wheel Drive Auto News , Featured , Subaru Repair Seattle If the check engine light comes on in your Subaru there is always a corresponding code set in the computers memory. So if playing with the BISS won't help the idle surge, I'd give the intake manifold area another. The O2 sensor ground jolts to the back of the chamber head, or one of the admission complex jolts. 6L, i had someone cut both of my rear cats off and just weld straight pipe in with my O2 sensors in it, hoping to increase exhaust flow. 85V, seems slightly high but it seems to not be an issue. If the problem is not given due attention, you could soon be dealing with internal engine damage. O2 sensor systems I found that the upstream left (1/1= Bank 1, Sensor 1) O2 Sensor voltage fluctuated quite a bit while the upstream right (2/1=Bank 2, Sensor 1) Sensor was quite stable. I'm left to decide if the problem is the AMM or the O2 sensor. Then when stopped the RPM goes normal. Use the scanner data stream to observe O2 sensor input data. 1) Ride with the O2 sensor function NOT connected to the Motronic to get baseline data ON AFR/Lambda. Code 14- This code is set when the cst voltage is low, typically close to 0 volts. Adjust the synch crossover cable to balance the mercury at 1500 RPM (just barely off idle). The PCM uses this information to adjust injector pulse-width to achieve the 14. Finally I found out it was surging even with the IAC unplugged. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. So I replaced it (downstream of the cat) with a new Bosch one. Compare the original and the new oxygen sensor(s) for the correct thread size. Further analysis of the datastream revealed more to the story. The suggested O2 parameter changes and a few BPW/injector related tweaks have helped with the surging, but it's not completely gone. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. 2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream. When they switch with the upstream ones, that means that cats are shot. A finely tuned fuel injection system with an oxygen sensor can maintain an air/fuel ratio within a close tolerance of. Gm Global Technology Operations Llc. Check fuses, connectors and wiring in the O2 sensor heater circuit before blindly replacing the sensor - any of those can also cause the code. your downstream oxygen sensor (bank 2) is going bad. The main cat $400-$500 to fix and up to $700 if the two front cats needed replaced also. It is there to monitor catalyst efficiency. The front alters air fuel ratio the rear is from long term short term fuel trims. • the spring-loaded throttle plate will return to a default position of 15 % throttle opening. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. However, such circuits often come at the price of far higher complexity. 5mm free play, then adjust either for correct synch) Reset throttle cable free play at. The Oxygen Sensor (also known as O2 or Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine’s exhaust. It is once again regarding an O2 sensor. THE OEM toyota manual goes into detail on o2 sensor parameters. Once the cat is hot most of the HC is burned off the Rear O2 sensor will level out quite a bit (at idle) If the computer see the rear O2 sensor switching too fast after it's hot you will get a code for poor cat efficiency. As the brake pedal was held down, not only did the O2 sensor report lean but short term fuel trim was rising rapidly. Chevrolet Blazer has no power and engine bogs down. It will run normal on occasion but only lasts about 45 seconds or so. The sensors are usually abbreviated as O2S1B1 (O2 Sensor, Bank 1) Sensor 1 must have attractive results, and swing quickly from around 0 to less than 1V. Low O2 voltage means you're running lean. I'm fairly certain they were original stock ones based on the corrosion but with the proper O2 but socket, loosening them up wasn't as bad as I anticipated. By enabling the absorption sensor, there is an alarm warning at each minimum voltage variation inside the electric circuit of the vehicle (e. The O2 sensor generates a voltage signal that is proportional to the amount of unburned oxygen in the exhaust. Vacum leaks are unlikely. 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. P0138 code definition. If the data between the two sensors becomes more similar, the vehicle's computer may trigger a catalyst inefficiency check engine code, which turns on the Check Engine light. are the two related? one o2 sensor was 178. I read somewhere that the second o2 sensor (downstream) doesn't have any. 5 volts for 3 seconds after starting engine. The leading cause of vehicle Check Engine lights is a faulty oxygen sensor. This code is triggered by the first downstream (front) O2 sensor. Others on the Internet have reported replacing an oxygen sensor will fix this issue. Should I go ahead and replace both Or is there anything I can try to fix the issues. Shop online for Oxygen Lambda Sensors at Automotive Superstore Alternator Voltage Regulators; AFI OXY1045 O2 Oxygen Lambda Sensor (BOSCH) $69. This sensor is the master switch in the fuel control feedback loop. The engine was already warmed up so the coolant temperature jumps to about 200 as soon as I start the car. The ones afterwards monitor the cats afterwards. This is a discussion on engine codes for your leisure within the Dodge Dart Maintenance forums, part of the Dodge Dart Garage - The Mopar Zone category; P0016-crankshaft/camshaft timing misalignment p0031-o2 sensor 1/1 heater circuit low p0032-o2 sensor 1/1 heater circuit high p0033-turbocharger surge valve control circuit open p0034-turbocharger surge valve. The computer doesn't detect how high the voltage goes. The oxygen sensor transmits the data to the vehicle’s PCM to maintain the optimal air to fuel ratio for your engine. Motor will stumble on occasion at speed and idle. On startup, I pulled out, and the CEL greeted me. Remember me Not recommended on shared computers. 7 V, while O2 bank 2 sensor 2, is hovering between 0. 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. Checked with my scanner and showed faulty O2 sensor bank 1 and 2. The sensors are usually abbreviated as O2S1B1 (O2 Sensor, Bank 1) Sensor 1 must have attractive results, and swing quickly from around 0 to less than 1V. What I did was measure the O2 sensor voltage right at the ECU input. When the mixture is rich the oxygen content is low and the voltage signal will remain on the high side of the 450 mV mid-range. Not too important and don't really need to be replaced. This usually means there is excess fuel in your engine, which can cause further problems. This case study is on a 1996 Chevrolet Blazer with a 4. surging at idle and. What is the most important emissions control device on a vehicle today? The catalytic converter, because it cleans up any exhaust pollutants that exit the engine. To check the sensor's rich response artificially richen the mixture by, if possible, clamping the return fuel line momentarily. O2 sensor systems I found that the upstream left (1/1= Bank 1, Sensor 1) O2 Sensor voltage fluctuated quite a bit while the upstream right (2/1=Bank 2, Sensor 1) Sensor was quite stable. right side from driver seat POV) for "High Voltage error" or something along those lines. Systems can include a scr configured to receive reductant at a variable dosing rate, an upstream nox sensor, and a downstream nox sensor. It doesn't hurt if the total voltage goes above 1. The PCM uses this information to adjust injector pulse-width to achieve the 14. 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. Honda Buyers Guide -- 2020 Honda crash tests, 2020 Honda service bulletins, 2020 Honda recalls. The sensor must have voltage and ground to produce a signal, so check these terminals first with an analog voltmeter. The HO2S produces a voltage that varies between 0. Oxygen sensor powerchip unleashes lots power of your stock engine by turning off some engineering restrictions applied by the car manufacturer. Sensor Type: Heated. A P0138 code show is 02 sensor High voltage Bank 1 Sensor 2 This is on a 1996 dodge ram pickup where is this sensor? That is behind the catalytic converter. 45V the exhaust is lean, and if the voltage input is over approx. Everything works including the OBDII sensor. I recently fixed two broken exhaust manifold studs on the passenger side, and I was hoping that would clear up my issue, but it doesn't seem to have helped. The operating voltage for an o2 sensor is between 0-1v. At the end of the study session, patients stated their preferred stocking based on comfort. Check Engine Light comes on. Common with 16946/P0562/001378 - System Voltage: Too Low stored in other control modules. If the voltage input at the ECM is under approx. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14. DTC P2122 Pedal Position Sensor 1 Circuit. The HO2S produces a voltage that varies between 0. There could be a vacuum leak downstream of the MAF sensor. 7-to-1 air/fuel ratio necessary for proper engine operation and to control emissions. Most noticeable in 5th above 120 km/r. Wild O2 sensor swings? I'm getting some wild O2 swings in my data files, what does it mean when output is less than 100 mV? I'm thinking these swings may have something to do with the low speed and decel surging I'm experiencing - they seem to match up time wise in the log file. 2019 Honda crash tests, 2019 Honda service bulletins, 2019 Honda recalls. • the spring-loaded throttle plate will return to a default position of 15 % throttle opening. P0038 which I have been told is driverside downstream. Start by getting the car up on some safety stands, then roll underneath it with a. As the oxygen content changes at the downstream sensor, the PCM calculates how much air-fuel ratio change is required. The downstream O2 sensor only measures if the cat works on your vehicle. now it's loud when idling and runs rough. Others on the Internet have reported replacing an oxygen sensor will fix this issue. If its B2 S2 that means Bank 2 (opposite Bank to Bank 1) and the downstream after cat o2 sensor. 5v where it is connected. The O2 sensor generates a voltage signal that is proportional to the amount of unburned oxygen in the exhaust. Mind you it was running fine when I parked it. O2 num 1 voltage does vary between. 08 Z06 LS7 big cam and low rpm light throttle surging - maybe mechanical issue?? Cold air intake, long tubes, corsa exhaust. This phenomenon is commonly known as "surging" and is happening because of erratic idling. speed reaches 1,500 rpm, then fuel cut is cancelled. It detects the amount of oxygen in the exhaust gas compared to the outside air. But I decided to replace the throttle position sensor and the Idle Air Control. 450 volts) and lack of it will send the voltage signal high (over 0. 3L surging mil lamp on. A bad oxygen sensor can impede the air/fuel mixture of an engine or interfere with the engine combustion, both of which can cause an engine to miss, or run irregularly. It also looks like the upstream O2 sensor switches rapidly while the downstream O2 sensor voltage is fairly flat at idle but also switches rapidly during portions of the acceleration and highway driving. 980, with bank 2 being a little higher. Direct pressure measurements were obtained while lying and standing using the PicoPress device (Microlab Elettronica, Nicolò, Italy). For the downstream sensor, you will find it easier to access the O2 sensor from underneath the car. By enabling the absorption sensor, there is an alarm warning at each minimum voltage variation inside the electric circuit of the vehicle (e. The electronic control module determines the controls the throttle plate and fuel control valve to provide the correct air/fuel ratio based on driver demands. STFT is at 99% reading from the downstream O2. Diagnostic Trouble Code (DTC) Charts and Descriptions P0406 - Exhaust Gas Recirculation (EGR) Sensor A Circuit High Crown Victoria, E-Series, F-150 4. A bad oxygen sensor can negatively impact an engine's performance in a variety of ways. To test the heating system go under the car and disconnect the O2 sensor and look for voltage on the harness side of the connector (not the sensor side). Backprobe the other heater wire, sensor plugged in, and take a voltage reading. The voltage produced by a narrowband O2 sensor is only supposed to be 0-1V. 4L, Town Car. The O2 will then start working in reverse. sensor 1/1 heater circuit high * p0033-surge valve solenoid circuit * p0037-o2 sensor 1/2 heater circuit low * p0038-o2 sensor 1/2 heater circuit high. The last year or so I have been getting poor gas mileage. With the Sensor 1 plug disconnected, it is now a simple matter to use a 12mm box end wrench to remove the two bolts holding the sensor 1 and gasket on the exhaust system. your downstream oxygen sensor (bank 2) is going bad. The Hyperboost unit takes removes the barriers placed on the ECU by modifying the O2 sensor signal the device modifies the voltage signals of oxygen sensor and allows more fuel to be pumped to the injectors. The upstream oxygen sensor on your OBD II equipped Jeep 4. MAP code came up and was wondering what does this sensor do? Also downstream O2 sensor came up. Cummins ISL-G Engine Control System The control system for the ISL-G engine is a closed loop control system. 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. A bad or failing oxygen sensor will have a negative impact on environmental emissions and engine performance, so there are a 3 things to watch out for before your oxygen sensor completely fails. Oxygen sensors are probably one of the most incorrectly replaced items on a vehicle. Why the top O2 sensors show 0. Page 1 of 3: How to Test the Throttle Position Sensor (2000-2007 4. 7 to 1 AFR for gasoline). Before I retired I would get 370 miles in a fillup now I,m lucky to get 250. The front O2 sensor looks newer, so that one should be OK. Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. 5V --- expected due to the internal biasing that I mentioned. HELP! Explorer rough idle, can't figure it out! The first time I had it checked out the right side downstream O2 sensor was replaced. Whether a part big or small, fixing your car or truck with top quality parts is the best strategy every single time. Magnum Lambda-ECO fuel saver air fuel sensor will not affect engine reliability durability. - When downstream o2 sensor is unplugged from the wire-loom is does NOT throw a P0037 - When upstream o2 sensor is unplugged, there is no change (still have a P0031) - There is no obvious damage to my upstream o2 sensor - The 15amp o2 Heater fuse under the glovebox is not blown (I've swapped in known good fuses). it doesnt hurt, while the car is off, to unplug and replug the o2, maf, tb, or pedal. Others on the Internet have reported replacing an oxygen sensor will fix this issue. However I'd rather replace a $40-$80 O2 sensor any day than an $800 catalytic converter without more evidence of failure. You need catalytic converters back to fix this problem. What do you do when several sensors will not fix it? Even nevertheless the root dilemma on this Hyundai was human mistake, the tests and solutions I’m displaying are even now applicable to any car or truck using ‘normal’ zirconia O2 sensors. The operating voltage for an o2 sensor is between 0-1v. The downstream O2 sensor is used to test the Catalytic Converter, the PCM compares the output of the Upstream and Downstream O2 sensors, before and after the Cat, to determine if the Cat is working. VW CC 2010 2. Use the scanner data stream to observe O2 sensor input data. When you installed it, did you notice it's slightly variable?. The downstream sensor is just a nanny for the cat and doesn't effect fuel/air at all. The 02 sensor varies voltage about 1v if exhaust is rich, down through about. In other words, if the oxygen content is low, the volt-age output is high; if the oxygen content is high the output voltage is low. For 1-wire O2 sensors, just follow the instructions for "Sensor output" above. The upstream oxygen sensor on your OBD II equipped Jeep 4. Key-dance revealed P0157 - Bank 2 Sensor 2 driver downstream had a low voltage condition. a - As the efficiency of the catalytic converter drops from deterioration, the switching rate of the rear O2 sensor signal will start to look like the front O2 sensor signal. • the spring-loaded throttle plate will return to a default position of 15 % throttle opening. A P0142 GM code definition:the Bank 1,3 O2 sensor or the 3rd downstream (post-cat) O2 sensor on Bank 1. 7 to 1 AFR for gasoline). The rear oxygen sensor installed after the catalytic converter is called 'downstream' or Sensor 2. 45v point about twice per second if working well. 4L, Town Car. 3) Adjust Lambda upward and downward in small steps to measure its effect on warmed-up driveability. But anything is possible. Compare the original and the new oxygen sensor(s) for the correct thread size. they arent cheap and you can do yourself but depending on age and condition of exhaust can. Check for a code relating to the auto shutdown relay circuit. 2004 Civic EX Coupe o2 sensor Hello, I'm new to this forum and found this post. The Downstream o2 Sensor wiring drooped and rubbed on the Drive Shaft until it was shredded. Very rarely passed. Key-dance revealed P0157 - Bank 2 Sensor 2 driver downstream had a low voltage condition. I had a surging issue and truck got horrible gas mileage. testing the o2 sensor requires simulating rich and lean conditions on demand. What Does P0132 Code Mean? OBD-II Code P0132 is caused by an oxygen sensor circuit high voltage (Bank 1, Sensor 1). Magnum Wideband Oxygen sensor simulator or with other words Ferrari 355 Oxygen Sensor Emulator available to all vehicles on which the emissions are monitored through 1 up to 4-wire narrowband or wideband zirconia lambda sensor working in 0 up to 1. Driveability has gone to crap. DTC P2080 Exhaust Gas Temperature Sensor Upstream of DOC Rationality Failure. Most noticeable in 5th above 120 km/r. Because the left one was cycling so much, I immediately thought that I had an exhaust leak on that side and the other (right) side was working fine. Also, I can't imagine that 1-wire non-heated o2 sensors are very common to find in modern day EFI systems, but it used to be a common issue for cars with aftermarket Long Tube headers to have surging issues that were caused by the o2 sensor cooling down to the point that the ECU would revert back to "Open Loop", then when the sensor would get. 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. 0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. 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. About 4 or 5 years ago a dealer told me the cats were bad. The Upstream O2 Sensor can adjust the goal voltage to accommodate for slight fuel/air variances. 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. 6) An engine surges intermittently when driven at cruise speeds. They seem to be okay. The data from this sensor is compared to that of the upstream sensor. I'm not ready to throw in the towel on the wideband sensor yet. surging at idle and. P0121, P0122, P0123. 7-to-1 air/fuel ratio necessary for proper engine operation and to control emissions. It's a hot job (literally) that operates at temperatures of 600 to 1000 degrees F. 2 or maybe up to. Sorry O2 sensor was only the driver side, passenger side was not done yet. Open loop is when the ECU is not referring to the o2 sensor for feedback. 00, the other is 68. Because the left one was cycling so much, I immediately thought that I had an exhaust leak on that side and the other (right) side was working fine. your downstream oxygen sensor (bank 2) is going bad. After months of normal driving with no problems, my 2003 Honda Civic EX check engine light came on during a long trip. See this page for a list of common oxygen sensor contaminants. This usually means there is excess fuel in your engine, which can cause further problems. The following steps should be taken into account during MAF sensor troubleshooting: • Check the connector for a correct fit and good contact. I started researching it and i'm guessing there is too much exhaust flowing passed the sensor. The ECU runs as normal, but the signal of oxygen sensor power chip manipulates the signal every microsecond delivering higher horsepower, torque and acceleration as well. Always seemed to have a little bit of rough idle in my opinion. So, Friday evening I pulled the car out of the garage to wash it and prepare for a show Saturday morning. 2) Attach virtual-narrow-band O2 function with Lambda=1 to verify that it runs correctly and stays Closed Loop as per the stock O2 sensor. What you will need. The sensors are usually abbreviated as O2S1B1 (O2 Sensor, Bank 1) Sensor 1 must have attractive results, and swing quickly from around 0 to less than 1V. Either waynew TBI 1 wire o2 sensors are like 20 bucks. 1 volt to as much as 0. Bank 1 is passenger side, sensor 2 is the downstream sensor, post catalytic converter. re: signs of a failing etm and its relation to the maf sensor Post by evegreen » 13 Feb 2010, 17:57 Thank you for this post, it was extremely valuable and easy to translate for me(a total illiterate when it comes to car talk but I know my car). went to autozone the next day and ran it. I was always told that if there is an exhaust leak after an O2 sensor that it wouldn't usually contribute to a problem but given the proximity of this O2 sensor to the leak could it be the reason for my idle issues? There is no downstream O2 sensor on this car. If the B1 upstream AFR indicates lean, that value might be verified by a B1 downstream O2 sensor indicating less than 600 mV. The front oxygen sensor is located before the catalytic converter (upstream) and the rear oxygen sensor is located after the converter (downstream). OfferVault © Zulma Corporation Limited. Voltage signal outputs from the O2 sensor are lower when more oxygen is present in the exhaust (lean condition). Consult your service manual for it's location if you need help. So if playing with the BISS won't help the idle surge, I'd give the intake manifold area another. 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. A stuck open EGR valve will create a lack of oxygen in the exhaust, since the re-circulating exhaust has all its oxygen already burnt. JEEP WRANGLER Which o2 Sensor is P0058 Ive got 2 o2 sensor codes popping up. Method for controlling and/or monitoring the performance of selective catalytic reduction devices (scr) and systems incorporating the same are provided. First O2 Sensor Basics video: https://youtu. In other words, if the oxygen content is low, the volt-age output is high; if the oxygen content is high the output voltage is low. 3L surging mil lamp on. At first I thought the O2 sensor might be lazy when reporting the lean to rich transitions. The sensor must have voltage and ground to produce a signal, so check these terminals first with an analog voltmeter. 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. Start by getting the car up on some safety stands, then roll underneath it with a. MPG will go down with this, because engine is actually running Richer than it should. I replaced the fuse, the o2 sensor connector and the sensor itself. The HO2S produces a voltage that varies between 0. Notice that Toyota refers to AF sensor which I assume is short for air/fuel sensor or oxygen sensor. if you google search "nissan code p0430" you will find all the info. AFI Australia for the largest range of Fuel Injection and Engine Management parts for Wholesale and Trade Customers including Fuel Pumps, Lambda Sensors, Throttle Body, MAF, Fuel Injector, Fuel Injection Pump, Oxygen Sensor, Position Sensor, Coil Pack, MAP Sensor, Submersible Pump, O2 Sensor, Diesel Injector, Crank Sensor, Diesel Filter, Air Flow Sensor, Crankshaft Sensor, Crank Angle Sensor. If the sensor detects a lean condition, the ECU increases the injector pulse width to compensate and vice versa. testing the o2 sensor requires simulating rich and lean conditions on demand. Today I got an oxygen sensor to replace the disconnected one downstream (it was disconnected because it was blowing the heated O2 sensor fuse). It will run normal on occasion but only lasts about 45 seconds or so. So, I replaced the upstream O2 sensor with a new Bosch one. I started researching it and i'm guessing there is too much exhaust flowing passed the 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. Chevrolet Blazer has no power and engine bogs down. Check out free battery charging and engine diagnostic testing while you are in store. 45V the exhaust is lean, and if the voltage input is over approx. 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. The connector on the sensor looks clean with no signs of splices. In closed loop mode, the ECU attempts to hold the air/fuel ratio around stoichiometric (14. It goes from 950 rpm up to 1500rpm than drops to 450rpm and back up eventually stalling. Got it scanned and it's P0420: Catalyst efficiency below threshold bank 1. This can be from air leaks, sensor issue, fuel issue, computer issue. If the sensor shows low to no voltage, this means the sensor could be defective. Mind you it was running fine when I parked it. (K243) O22/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE (K243) O2 2/2 SIGNAL CIRCUIT OPEN (K904) O2 DOWNSTREAM RETURN CIRCUIT OPEN O2 SENSOR PCM P0032 - O2 SENSOR 1/1 HEATER CIRCUIT HIGH When Monitored: Battery voltage above 10. P0138 = O2 sensor shorted to voltage oxygen sensor input voltage maintained above normal. An upstream O2 sensor should switch high/low fairly rapidly when warm. sensor voltage is good at. Supposedly the true O2 sensors are the upstream ones. 9 volts which follow the behaviour of the engine revs. they arent cheap and you can do yourself but depending on age and condition of exhaust can. By narrowing the scope of the data stream to include only pertinent data, you will get a faster data response. Use Modes 5, 6, and 7 to determine monitored O2 sensor results. Couple a Hyperboost power module with our X2 Power Performance Chip for MAXIMUM horsepower gains - anywhere from 5. 1998 Ram 1500, 5. My 2005 Buick LaCrosse runs smooth. The data from this sensor is compared to that of the upstream sensor. If there's insufficient change in the sensor's output voltage during a 90-second inter-val of off-idle operation at or above 1500 rpm with a road-speed of 25 to 62 mph, July 2010 29 Photo montage & illustration: Harold A Perry; images: Toyota and Thinkstock. sometimes has a low voltage reading for the cause of the 02 to send a wrong reading causing either or rich or lean that I have seen. As oxygen sensors age, they become sluggish, so they are not quick enough to respond to changes in air/fuel mixture. The rear oxygen sensor installed after the catalytic converter is called 'downstream' or Sensor 2. Some engines may have as many as six O2 sensors. I do not hear any exhaust leaks before the downstream O2 sensor. The downstream O2 sensor is used to test the Catalytic Converter, the PCM compares the output of the Upstream and Downstream O2 sensors, before and after the Cat, to determine if the Cat is working. If the voltage input at the ECM is under approx. I checked response from the o2 sensor to propane, I couln't seem to get a very high voltage reading it fluctuated on the low side. Most noticeable in 5th above 120 km/r. Sometimes it would drop to a healthy idle but when it did it would have a slight miss to it. 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. The engine computer supplies a base reference voltage of approximately one volt to the titania O2 sensor, and then reads the voltage flowing through the sensor to monitor the air/fuel ratio. Why the top O2 sensors show 0. WHAT IT MEANS WHEN YOUR GET A CODE READ OF PO420 OR PO430. 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. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14. Second, check the O2 sensors by following the Hayne’s Manuel. The downstream sensors should remain a fairly steady voltage within that same range, usually around the. Even if I completely zeroed the rate value in L0075 when the O2 voltage was off the rail (say between 800mv and 100mv) it made hardly any difference at all to how far the fuel accumulator would go. Welcome to the Mercury Check Engine Light codes page. P0136 - Low voltage/shitty second O2 sensor/connection on bank 1. Excess oxygen in the form of regular ambient air will send the O2 sensor voltage signal low (under 0. I am guessing that is the downstream o2 sensor that is in the cat from the factory (ECT meaning exhaust catalyst sensor not engine coolant temperature sensor), but with the current setup I have, I cannot bolt my stock downpipe to the o2 housing. the car surges, or when the gas pedal is floored there is hesitation for a good few seconds. 0 Volt, 0 up to 3. The oxygen sensor transmits the data to the vehicle's PCM to maintain the optimal air to fuel ratio for your engine. Use the scanner data stream to observe O2 sensor input data. HELP! Explorer rough idle, can't figure it out! The first time I had it checked out the right side downstream O2 sensor was replaced. With the Sensor 1 plug disconnected, it is now a simple matter to use a 12mm box end wrench to remove the two bolts holding the sensor 1 and gasket on the exhaust system. I'm getting an intermittent P013C code for passenger side downstream O2 sensor slow to respond rich-lean. If it is otherwise running normally, I have not seen an O2 sensor cause an engine to stall. in this vid i diagnose a faulty o2 sensor bank 2 sensor 2 a p0157 code on my 2002 chevrolet silverado. The Hyperboost unit takes removes the barriers placed on the ECU by modifying the O2 sensor signal the device modifies the voltage signals of oxygen sensor and allows more fuel to be pumped to the injectors. A finely tuned fuel injection system with an oxygen sensor can maintain an air/fuel ratio within a close tolerance of. The codes I am working to resolve are: P0137 low voltage Bank 1 Sensor 2 & P0140 Bank 1 Sensor 2 No activity detected. The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. The downstream O2 sensor only measures if the cat works on your vehicle. See this page for a list of common oxygen sensor contaminants. DOWNSTREAM VOLTAGES: With the catalytic converter at operating temperature, downstream voltages normally report in a range of 600-700 millivolts (mV). P0037 means there is a problem with the O2 sensor heater circuit. They may be measured at connector under hood -or- at ECU pins (see via links above). I was looking at the Innovative Motorsports LC-2 to replace the stock O2 sensor and use the narrowband simulation output to feed the ECM and put in a gauge also, but that will be down the road. sensor (high voltage. The main Appcar DiagFCA features:. If I get the engine superhot the o2 sensor downstream voltage drop to 0. The sensor must have voltage and ground to produce a signal, so check these terminals first with an analog voltmeter. 8 and STFT -4.