Downstream O2 Sensor Voltage Surging 1500rpm

Page 2- Failing O2 sensor symptoms? Normally Aspirated Powertrain. 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. Unlike the toggling voltage produced by conventional sensors, the air/fuel ratio sensor produces a linear voltage signal. You can connect the DVOM test leads to the sensor ground and signal wires in order to monitor live data from the O2 sensor. They ran a diagnostic test on my Subaru and it reported that there was an issue with the O2 Bank 1 Sensor 1. Disconnected the battery ground terminal. This tells the computer that the O2 sensor is not producing its own voltage. 246 O2 Sensor Bank 1 Sensor 2 - 0. 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. 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. Best Rated in Automotive Replacement Oxygen Sensors Compare the most helpful customer reviews of the best rated products in our Automotive Replacement Oxygen Sensors store. Symptoms of a BAD Oxygen Sensor. I just replaced the CATALYTIC CONVERTER but the scanner STILL shows a P0420 code. If it's switching between high and low numbers, similar to the upstream sensor, this is rock-solid proof that the converter is bad. Downstream O2 sensor voltage drops durring acceleration Normal? was created by Drunken Elvis 2. i was merely suggesting checking wiring and connection to mentioned sensors in case wiring is the issue, before you spend money. 7 O2 sensor voltage travels between. It doesn't matter if that's the original issue, TPS was replaced, needs to be calibrated. Because we have AF sensors we cannot compare a specific banks O2 upstream to an O2 downstream, but we can compare B1 O2 to B2 O2. So that's completely in the normal range. Report back to us with the correct code number. the rear o2 sensor makes sure that your cat is still doing it job of burning any on burn gas. A voltage is applied to the pump cell diffusion gap to maintain a constant sensing l 1 air fuel ratio through extreme rich and lean conditions. The Engine Control Module (ECM) monitors this voltage and determines if the exhaust gas is lean or rich. 5V? The following image clarifies my question. During cruising the Bank 2 O2 sensor reads around 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. it doesnt hurt, while the car is off, to unplug and replug the o2, maf, tb, or pedal. It is there to monitor catalyst efficiency. 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. Code P0138 refers to O2 bank 1, sensor 2, which is the one equipped after the catalytic converter, and may mean that one or more of these problems may have occurred: Faulty O2 sensor Short to. Downstream O2 sensor (O2 1x2) - Tests the exhaust gas after the catalytic converter. The idle surges up and down. The front O2 sensor is behind the driver front wheel on the manifold right? And the sensor for exhaust gas temperature is on the downpipe? It could be possible they replaced the temperature sensor and not the O2. 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). 450 volts) and lack of it will send the voltage signal high (over 0. Older Style Ford O2 Sensor. P0037 means there is a problem with the O2 sensor heater circuit. Engine run time greater than one minute. Backprobe the other heater wire, sensor plugged in, and take a voltage reading. P0136 - Low voltage/shitty second O2 sensor/connection on bank 1. The sensor voltages seem normal aside from occasionally spiking above 1 volt. The code it is displaying is P0138 - O2 Sensor High Voltage Bank 1, Sensor 2. If it is jumpy between 0. It was telling the system to lean out (in error) that's why you had to richen the mixture. This proved a correlation between the sensor voltage signal and the NOx content in the case of constant oxygen content. Oxygen sensor simulator is a racing part. You should see some kind of pulse width modulated ground, which you can also verify with a test light connected to B+. Checking for reference voltage: Turn the ignition key to the On position but don't start the engine. The upstream sensor is really lazy, but not bad enough to trigger a DTC. Most mechanics will often say it’s the o2 that is shot when it is actually the cat. FOR BEST RESULTS COMBINE WITH SURGE PERFORMANCE CHIP! FEATURES OF O2 OXYGEN SENSOR POWERCHIP:. 00, the other is 68. just wondering if he placed the O2 sensor too far back or if the cat helped it read correct. 2000 Ford Contour Downstream O2 Oxygen Sensor for L4 2. At operating temperature the oxygen sensor signal varies between 0 and 1,000 mV. I'd look at the upstream O2 sensor as well, especially if the manifold was just replaced. I second the opinion do not mess with the factory adj on your new EHA valve. As these two graphs show, the post-cat barely crosses 0. stuck at 0. When the air/fuel mixture is lean and there is more oxygen in the exhaust, the sensor's voltage output drops to 0. 5V? The following image clarifies my question. 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. Therefore, in an in-line 4-cylinder engine, the term "Bank 1, Sensor 1" simply refers to the front oxygen sensor. Testing methods are also different. It is not CARB approved. If there's insufficient change in the sensor's output voltage during a 90-second interval of off-idle operation at or above 1500 rpm with a road-speed of 25 to 62 mph, and at least 140 seconds have elapsed since start-up (before the 90-second interval begins), DTC P0125 will set. Downstream O2 Sensor Voltage. It detects the amount of oxygen in the exhaust gas compared to the. The O2 sensor just reads oxygen content in the exhaust, THAT'S IT. So I entered O2 test screen and tried driving with the test screen on. Bank 1 sensor 1 is the primary O2 sensor that should be located on the header. Upstream voltage is "high" because it is a "Wide Band" 02 sensor, the set voltage differ greatly from one OEM to another and in some cases even from one sensor brand to another; but normal is ~2. I'm looking for some answers. When the engine is started cold, there are four primary inputs into the computer. P0131-O2 Sensor Circuit Low Voltage - Bank 1 Sensor 1 But it's gone at the moment. Will investigate tomorrow. The procedure is the same for the downstream O2 sensor (Bank 1 Sensor 2). The computer evaluates and compares signals from the upstream and downstream sensors to assess whether the cat. 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?. Headers require both up- and downstream O2 Sensor elimination. The voltage produced by a narrowband O2 sensor is only supposed to be 0-1V. the car surges, or when the gas pedal is floored there is hesitation for a good few seconds. The rear oxygen sensor installed after the catalytic converter is called 'downstream' or Sensor 2. 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. This would change the readings downstream at the O2 sensor and tells the engine how to run accordinglywhich causes this. 25 is the more normal setting for downstream sensors. p0058 is the other ones. But the Upstream sensor suddenly only reads 0. the idle surges. The post cat sensor is a cat performance sensor, so it checks to make sure the catalytic converter is working properly. The O2 sensor 1 on Bank 1 (upstream) which is the faulty one, has a grey plug, and the downstream one has a purple one. 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. P0038 which I have been told is driverside downstream. If the catalytic converter is working properly, the rear O2 sensor will hold a steady voltage reading. P0157-O2 SENSOR 2/2 CIRCUIT LOW VOLTAGE When Monitored: Engine running for less than 30 seconds and the O2 Sensor Heater Temperature is less than 251°C (484°F) with battery voltage greater 10. 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. I searched on here and have checked the MAF sensor but with or without the MAF in line doesn't seem to. Estimation of Individual Cylinder Fuel Air Ratios from a Switching or Wide Range Oxygen Sensor for Engine Control and On-Board Diagnosis. This tells the computer that the O2 sensor is not producing its own voltage. Hi guys, I have been having a engine light code that reads O2 sensor bank1 on OBDII reader. I have cleaned the throttle body very well. are the two related? one o2 sensor was 178. As I stated in post #2 your O2 sensor is not acting normally. Bank 1 is passenger side, sensor 2 is the downstream sensor, post catalytic converter. Learn what does P0152 O2 Sensor Circuit High Voltage Bank 2 Sensor 1 means, location and how to repair? The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. Downstream O2 Sensor Voltage. If you want to compare your upstream sensor heater resistance, those heater wires are green-yellow and red-white (for both banks). They are located in the driver and passenger exhaust manifold. 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). I'm going to try pb blaster or some other lubricant and order a brand new o2 sensor and replace. There are probably threads/videos on how to calibrate the throttle position sensor. If it has steady voltage, its functioning. Once the O2 sensor is heated up, it will override this voltage. P0038 which I have been told is driverside downstream. To verify the o2 sensor works, I switched the two downstream sensors. frontair fuel sensor has to work flawlessly. Battery was just replaced but the truck never had any problems. Testing methods are also different. I wish I could see if the O2 bank 1 sensor 2 was tracking the AFR on bank 1 sensor 1, but regardless, I'm guessing that O2 Bank 1 Sensor 2 is fluctuating way too muchtoo low and lean at times. The performance of the O2 sensor tends to diminish with age as contaminants accumulate on the sensor tip and gradually reduce its ability to produce voltage. The ECU compares the information provided by the downstream sensor to the information received from the upstream O2 sensor. i think its the downstream one. It goes from 950 rpm up to 1500rpm than drops to 450rpm and back up eventually stalling. 9V in Gen 1 and no codes will be thrown, but you will probably be throwing way too much gas down the cat. As oxygen sensors age, they become sluggish, so they are not quick enough to respond to changes in air/fuel mixture. It also loses engine oil after driving (around 1 Qt per few hundred miles), but there is visible sign of oil on the out side of the engine, probably due to old gaskets. Whether a part big or small, fixing your car or truck with top quality parts is the best strategy every single time. 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). Backprobe the other heater wire, sensor plugged in, and take a voltage reading. If I held it at 1500 rpm it would do it briefly at first and then stop doing it. 00, the other is 68. O2 SENSOR HEATER OPERATION O2 HEATER ELEMENT O2 HEATER GROUND CIRCUIT OPEN O2 SENSOR O2 HEATER CONTROL SHORTED TO VOLTAGE O2 HEATER CONTROL CIRCUIT OPEN PCM P0138-O2 SENSOR 1/2 VOLTAGE HIGH When Monitored: The engine running for 119 seconds. The mechanic told me it has something to do with the wiring harness that connects to the computer, or a wire has been tugged/pinched during installation (made sure I didn't touch anything other than the oxygen sensor). It doesn't matter if that's the original issue, TPS was replaced, needs to be calibrated. Unlike the toggling voltage produced by conventional sensors, the air/fuel ratio sensor produces a linear voltage signal. You can connect the DVOM test leads to the sensor ground and signal wires in order to monitor live data from the O2 sensor. 66 Maybe this is nothing, but since the truck tends to cruise at 1700 RPM or so, I found it interested and could also help explain the difference in the LTs between the banks. Unplug the O2 sensor from harness. If the voltage input at the ECM is under approx. 65 volts but the voltage change very fasts. When in closed loop, this value should be rather stable, usually at a low value at idle (below 0. Of course at this point, they should set a fault code. If a trouble code has been stored on the computer memory indicating a problem with the MAP sensor, it's a good idea to actually test the sensorm to confirm. 2000 Ford Contour Downstream O2 Oxygen Sensor for L4 2. Use the scanner data stream to observe O2 sensor input data. The main purpose of a downstream O2 sensor is to monitor the efficiency of the catalytic converter. Don't replace the downstream O2 sensor. Downstream O2 sensor (O2 1x2) - Tests the exhaust gas after the catalytic converter. The two O2 Sensors mirror each other (sinusoidal trace from 0. Three codes present, two oxygen sensor codes and a low system vo Trouble codes: P0141, P0132 (O2 Signal high bank 1 Sensor 1), P0562 (System voltage low) View: 1995 Infiniti Q45 A 4. o2 sensor connected The o2 sensor is in the circuit so your test is the same as ecm mode 2 test. Like I would be in 5th gear on the freeway barely going 50 mph. (try all) and measure at 1500 rpm. p0058 is the other ones. All - Miss, rough idle, hesitation, surge: see ASD diagnostics - An intermittent ASD relay or associated wiring can cause stalling and hesitation because the battery charging circuit and O2 sensor heaters are controlled by the ASD relay. Older Style Ford O2 Sensor. 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. Battery was just replaced but the truck never had any problems. At operating temperature the oxygen sensor signal varies between 0 and 1,000 mV. the car surges, or when the gas pedal is floored there is hesitation for a good few seconds. Oxygen Sensor Diagnosis. No response may refer to the O2 sensor signal sent to the ECU. The front O2 sensor is behind the driver front wheel on the manifold right? And the sensor for exhaust gas temperature is on the downpipe? It could be possible they replaced the temperature sensor and not the O2. To verify the wiring, I plugged the B1S2 harness into the B2S2 o2 sensor and it worked plugged into the other side of the car. 85V, seems slightly high but it seems to not be an issue. 6 but slow to change. Engine run time greater than one minute. All torque down to factory specs. 0L SUV can be tested, and in this article, I'll show you how in a step-by-step fashion. stuck at 0. You can check for voltage to the oxygen sensor heater, and from the oxygen sensor, with an electrical multimeter. Anyone know where p0058 is Would make replacing it allot easier. Check Engine Light & P0141 After O2 Sensor Replacement Recently bought a 00 SR5 w/3. One side of the O2 sensor's sensing element is exposed to the exhaust stream and the other side to the outside air. The voltage produced by a narrowband O2 sensor is only supposed to be 0-1V. I have not yet fixed it as I am researching the best way to take care of the problem (this is how I found the recall). So that's completely in the normal range. 5mm free play, then adjust either for correct synch) Reset throttle cable free play at. I was told that it could be oil getting into the combustion chamber, either from the head or past the rings. voltage varies now 0. O2 sensor codes are often the most troublesome and misdiagnosed check engine light problems. The HO2S produces a voltage that varies between 0. 83000 mi: chk engine light came on ,stopped @ Autozone for a code reading (downstream o2)voltage low. Even though in the emissions check, the program is showing a green COMPLETE for O2 sensors and O2 sensor heaters, the real-time readings screen is showing 0 MV for both O2 sensors. 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. Generic Method Here are some fast and. Catalytic Converters & O2 Sensors Download PDF. So is the general consensus still that changing the O2 switch points in the Gen 4 E67 and E38 don't have any effect? I've tried moving around the values/voltages in min/max, rich/lean and cold offset tables and have yet to see any changes in logs. It also does not have power when giving it gas but then once pumping the gas a little and getting a little speed it will run fine at speed. 5V? The following image clarifies my question. They are located in the driver and passenger exhaust manifold. P0137 - OBD-II Trouble: O2 Sensor Circuit Low Voltage What Does P0137 Code Mean? Code P0137 is triggered when the powertrain computer or PCM determines that the rear oxygen sensor voltage remained below 400 millivolts for more than twenty seconds (varies with vehicle make and model) or that the air fuel ratio sensor remained in a lean-biased. That being said, yes, a faulty converter can cause the downstream O2 to report erroneously. Next thing I'm going to look at, and probably should have looked at sooner is the Intake Air Temperature sensor. If it turns out the sensor itself is at fault then I'd advise using a genuine replacement, but either you or any competent mechanic can fit it if you don't like dealer pricing. 5L right head VIN: JNKNG01D5S. I have replaced the O2 sensor a total of 3 times (under warranty) and I'm starting to think the O2 sensor isn't the problem. Good luck and keep us posted. I have a 2004 Dodge Dakota 4. My 1997 Lesabre has a surging issue at idle after it warms up. see how that works out. The Engine Control Module (ECM) monitors this voltage and determines if the exhaust gas is lean or rich. I have replaced the O2 sensor a total of 3 times (under warranty) and I'm starting to think the O2 sensor isn't the problem. 255 Oxygen Sensor Voltage Bank 2 Sensor 1 - 3. When the engine is started cold, there are four primary inputs into the computer. Use the scanner data stream to observe O2 sensor input data. The Truck runs now but with a slight hesitation/surge during idle and again at about 45MPH & 1500 R PM's. the idle surges. Anyone know where p0058 is Would make replacing it allot easier. I second the opinion do not mess with the factory adj on your new EHA valve. These products are shortlisted based on the overall star rating and the number of customer reviews received by each product in the store, and are refreshed regularly. O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) What the P0138 code means. ok first of the 94 didnt com with a map it came with s/d and test stuff before replacing stuff id check the fuel pressure and also you can have codes and the check engine light doesnt need to come on. 00 oe, with the wires. Next thing I'm going to look at, and probably should have looked at sooner is the Intake Air Temperature sensor. By narrowing the scope of the data stream to include only pertinent data, you will get a faster data response. That is, as the O2 sensor swing gets smaller, the switching. 0 volts suggests a short to ground in the wiring. That being said, yes, a faulty converter can cause the downstream O2 to report erroneously. The voltage produced by a narrowband O2 sensor is only supposed to be 0-1V. 6 but slow to change. Holden VL Commodore RB30), but have been used in overseas. It detects the amount of oxygen in the exhaust gas compared to the. They are located in the driver and passenger exhaust manifold. It also does not have power when giving it gas but then once pumping the gas a little and getting a little speed it will run fine at speed. With relatively richer mixtures present around the downstream oxygen sensor, voltage inputs to the computer will be above the 450mV bias voltage. Thanks a lot for all the pics and the detailed explanation. The downstream O2 sensor data should reach a mid-line and settle there, if the engine is running efficiently. 411 volts for 10. The truck throws no codes (just checked). When the air/fuel mixture is lean and there is more oxygen in the exhaust, the sensor's voltage output drops to 0. The downstream o2 sensor is located just past the catalytic converter in the exhaust manifold. 83000 mi: chk engine light came on ,stopped @ Autozone for a code reading (downstream o2)voltage low. When you installed it, did you notice it's slightly variable?. The MAF sensor was a few year old and cleaned with electrical cleaner a few months ago. 4 idle 2500rpm - STFT -10 to 6 LTFT 25 also 22. Well, that certainly sounds very familiar. At operating temperature the oxygen sensor signal varies between 0 and 1,000 mV. I've been having recurring issues with my Oxygen sensors on both sides, downstream (after the Cat). 1 to 18 LTFT steady 23. 4 Pcs O2 Oxygen Sensor 1, 2 Upstream & Downstream For Chevrolet C/K 1500 96-98 For a good sensor, voltage should fluctuate constantly between 0. For the downstream sensor, you will find it easier to access the O2 sensor from underneath the car. 5L MFI 4cyl the Oxygen Sensor is located under hood, center, rear engine area, mounted on catalytic converter. The O2 sensor measures the presence of O2 in the exhaust gases, (which under ideal conditions should be about 0. The front O2 sensor looks newer, so that one should be OK. 00 to check out , they suggested to keep driving it until light came back on , that was 1600 miles ago light still off. I can see the downstream O2 sensor voltage on my bluetooth OBDii reader and Torque app, but no upstream O2 sensors (due to it being wideband and Torque does not register this). Enhance throttle response, acceleration and low end torque. Backprobe the other heater wire, sensor plugged in, and take a voltage reading. When it is on the engine seems to have loss of power, car wants to stall and runs rough when in gear. 71000 mi Check engine light comes and goes. (try all) and measure at 1500 rpm. code is for the rear O2 sensor. A rich condition can be temporarily created with a propane enrichment tool and a lean condition can be temporarily created by removing a vacuum line. If the voltage input at the ECM is under approx. The front O2 sensor looks newer, so that one should be OK. it's the code for bad o2 sensor. Older Style Ford O2 Sensor. 00, the other is 68. The downstream O2 sensors for the most part do absolutely nothing throughout their service life. this is on the starboard engine. now getting a bank 1 lean O2 reading. 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. No matter what I tried I couldn't get that second o2 sensor to break free. Where are O2S11 and O2S21 Located. As I stated in post #2 your O2 sensor is not acting normally. When in closed loop, this value should be rather stable, usually at a low value at idle (below 0. 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. 2000 Ford Contour Downstream O2 Oxygen Sensor for L4 2. I haven't checked it at the ECU but that's probably a good idea to add to the list. Downstream O2 sensor (O2 1x2) - Tests the exhaust gas after the catalytic converter. The MAF sensor was a few year old and cleaned with electrical cleaner a few months ago. I hope that this new sensor is indeed the fix, it seems likely because that was definitely the original sensor. Used code reader which reported either failed catalytic converter or downstream O2 sensor failure. 9V under normal operating conditions. My cars check engine light came on and I took my code reader to it and it said po300 code random misfire. Since then my car is surging at idle. Finally got around to replacing the rear O2 sensor this weekend b/c inspection is due. Let's take a closer look at just what an oxygen sensor does and the steps you can take to do the work yourself. The downstream O2 sensor data should reach a mid-line and settle there, if the engine is running efficiently. I second the opinion do not mess with the factory adj on your new EHA valve. 5mm free play, then adjust either for correct synch) Reset throttle cable free play at. 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. with fuel filter, oil filter, oil, plugs, but didn't do the wires or PCV or other fluids. 2007 Jeep Grand Cherokee 5. 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. O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) What the P0138 code means. 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). I can notice it in all gears as long as my foot is constant on the pedal. The ECU compares the information provided by the downstream sensor to the information received from the upstream O2 sensor. code is for the rear O2 sensor. Full text of "Automotive Computer Control Systems William Husselbee" See other formats. If voltage from this sensor reads above 4. 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. 7 Vortec with a misfire, P0300 code for 3 months. For whatever reason in some cases each sensor would affect the other even tho they moniter different agendas. 7 V, while O2 bank 2 sensor 2, is hovering between 0. I put the o2 sensor back on and went for a test drive and like usual my car had no power. The ECU compares the information provided by the downstream sensor to the information received from the upstream O2 sensor. Upon replacing your sensor, usually a 3 to 5 M. 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. Since then my car is surging at idle. The procedure is the same for the downstream O2 sensor (Bank 1 Sensor 2). P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1. It was telling the system to lean out (in error) that's why you had to richen the mixture. The Downstream o2 Sensor wiring drooped and rubbed on the Drive Shaft until it was shredded. All - Ping. The whole manifold will stay less than 200 degrees during normal operation. If it turns out the sensor itself is at fault then I'd advise using a genuine replacement, but either you or any competent mechanic can fit it if you don't like dealer pricing. I am still a little unnerved by an apparent O2 sensor on a 2006 model. For example HO2S11 would be the oxygen sensor on bank 1 and first in line (pre catalytic converter) and HO2S12 would be on bank 1, but second in line (the monitor) An oxygen sensor creates a voltage between 0 and 1 volt by means of a chemical reaction between the sensor element and the oxygen in the exhaust passing across that element. The upstream o2 sensor popped out easy-peasy. soaked overnight in Ring Free and reinstalled. almost to the point of worrying it isn't going to "go". Next thing I'm going to look at, and probably should have looked at sooner is the Intake Air Temperature sensor. These are the crank sensor, the coolant temp sensor, the MAP sensor, and the throttle position sensor. 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. I can see the downstream O2 sensor voltage on my bluetooth OBDii reader and Torque app, but no upstream O2 sensors (due to it being wideband and Torque does not register this). P0038 which I have been told is driverside downstream. 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. 5L MFI 4cyl the Oxygen Sensor is located under hood, center, rear engine area, mounted on catalytic converter. 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. 2007 Jeep Grand Cherokee 5. Engine run time greater than one minute. Depending on your vehicle and scan tool maker you may have several items to check. I have pulled the knock sensor sub-harness and have checked volts at the connection. The best place I have found to buy a good quality O2 sensor socket is SEARS, they sell a Leslie or KD tools brand (forget which it was), it costs in the $10-12 range, well made and beat out the two O2 sensor sockets I split (both were made in China and cost more than the high quality socket from sears). Real sensors go over 1. This will force more fuel through the injectors and should cause the O2 sensor's voltage to increase to 0. P0131-O2 Sensor Circuit Low Voltage - Bank 1 Sensor 1 But it's gone at the moment. What you will need. 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. It doesn't hurt if the total voltage goes above 1. P0131-O2 Sensor Circuit Low Voltage - Bank 1 Sensor 1 But it's gone at the moment. Checking for reference voltage: Turn the ignition key to the On position but don't start the engine. 45V the exhaust is lean, and if the voltage input is over approx. The "upstream" O2 sensor(s) in the exhaust manifold(s) monitor the air/fuel mixture, while the "downstream" O2 sensor(s) to monitor the catalytic converter(s). You should see some kind of pulse width modulated ground, which you can also verify with a test light connected to B+. On 2005+, it does help with fuel trims. While watching the O2 sensor output and reving the engine you should definitely see the voltage drop off below. I replaced the fuse, the o2 sensor connector and the sensor itself. On startup, I pulled out, and the CEL greeted me. Their purpose is to monitor the condition of the Cats. Symptoms: - Starting the car cold, the engine idles at ~1500RPM for about 30 seconds before settling down to a consistent 1000 and will idle there fine. All sensors are showing correct voltage. 6 but slow to change. I put the o2 sensor back on and went for a test drive and like usual my car had no power. 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. No response may refer to the O2 sensor signal sent to the ECU. Downstream O2 sensor (O2 1x2) - Tests the exhaust gas after the catalytic converter. This proved a correlation between the sensor voltage signal and the NOx content in the case of constant oxygen content. The voltage is dependent on % of oxygen at the sensor compared to outside air % of oxygen. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: