This code popped up and I was a little confused when it said O2 sensor heater. But this video clearly explains what O2 sensors do, what where they're located and what the cause might be. I love coming to this RUclips channel.
I have looked at many many videos on my fault code P0037 and this one by far has given me the most in depth information on what may be the problem. Thank U!!!!!
The whiteboard paired with clear explanations made for a great video 🤙🏼 Currently working on a different chassis and I still feel confident enough to diagnose. Thank you.
Super helpful thank you! I need help. Instead of replacing the O2 sensor, I preformed the test like you showed in the video. I found that I do have power to the senor but no pulsating light (4:56) when checking the PCM circuit. No light at all. So, I'm assuming something is broken, as explained in the video at around 5:56. How to I find this broken connection?
Great detailed video, however after going through all of your steps on bank2, I realized that if the O2 heater is good, the O2 sensor would be warm / hot to the touch and include all of your TS steps! BTW, still waiting on that 2000 Chevy Silverado door actuator change w/o opening the effected door! Thanks again!
Great video! I have a 2011 Impala LS and I can't clear the P0036 and P0141 codes. I replaced the sensor, I have power on the supply side heater and the computer grounds as well. I ohmed out all 4 wires to the ECM and found continuity and no resistance. I believe either the heater is bad in the new sensor(Denso) or the ECM is faulty.
Finally a video that doesn't leave me scratching my head.... Thank You can you make one explaining how to install door key auto locking device pertaining to the actual key and tumbler. 03 bmw x5?
absolutely amazing video! great explanation and demonstration on how to properly diagnose it!!! Helped me figure out that my PCM was bad after the i got a o2 sensor heater malfunction
I am really blown away in how in depth this quick video was packed with valuable in depth information, I learned a lot in this video and I greatly appreciate the instructor in his explanation on what could be the reason this sensor is faulty. Variables that I never thought could be the reason like the after market remote starter.
Check the set of wires under your truck. Believe me i took this advice and when I inspected the wires under my truck where the transmission and the shaft meet. The wiring harness was rubbing so bad that it exposed the wires. Those wires lead to engine. As soon as i got them closed back up problem solved and my truck runs way better than before. Ever since i bought my 2009 suburban this is the best it ever ran. This got rid of this code and the other ones that had to do with faulty cpu code. Believe me an exposed wire can actually make your engine run bad and set off different codes.
Hi! What is the expected current flowing through an O2 sensors heater? i measure 0.5A only, which would be some benign 7 Watts of heating power. I measured 4 Ohms on the sensor which should give me more than 3 amps. Or is it pulsed and thus less? Plus side of circuit is fine, the cable to the PMU i still have to test. If the PMU is the problem, what do do?
Does the heater element only turns on while the engine is cold then shuts off, I have a 08 Jeep Patriot and the temperature of the O2 sensor is high even reaching operational temperatures. Would it be bad ECM? Car runs great.
Are you suppose to supply 12v directly to the pcm bypassing the load in the circuit? Could have just backprobed and should have had 12v on both heater wires Key on if the circuit was good,
If you dont have access to wiring diagram or forget the colours you can switch sensors side to side and see if code moves same as you would do moving coils to check misfire .
I have heater circuit code for all the 4 sensors for Ford explorer 09 could there any other reason apart from the possible reason you stated in the video just and what could they be would be a great help to check and diagnose them
good video ,, thanks for the info ,,, i have a 2009 mountaineer v8 and my check engine light just came on , when reading the code it show al 4 oxygen sensors are faulty ,, can this be right ?? ,, fuses are good ,, any adviced ? .. thank you .
I have that code in a Golf 4 1.4 (2001). The car fails the enission test and sparks get black very quick. But the sensor ( 5 wires) was already replaced. I tested the resistance of the heater and the voltage both with a multimeter. Resistance was about 4 OHM and voltage was 12 volts. Obviously, the engine is running rich. CO is 5 percent . I replaced nearly everything, but sparks get equally black very soon. First emission test in january 2024 showed 10 % carbon monoxide (engine had no emission problems in january 2022) Oxygen sensor and catalytic converter were then replaced. Second emission test showed the 2.4 % carbon monoxide. Better but far from good. Then temperature sensor, MAP (engine has no MAF) and ECU were replaced and electric throttle body was cleaned. Sparks were still black. Then fuel regulator and throttle were replaced. Sparks still black. Third emission test in octobre showed 5-6 % carbon monoxide. A live test shows an air/fuel-ratio below 14 most of the time. How common is it, that new oxygen sensors do not work properly? Should I get a new oxygen sensor?
How do you diagnose a p0133? I have a Jeep compass. Can't find fuse locations if it even has them. Pretty sure it wouldn't be and exhaust leak because b1s1 is right on top of the manifold. I've replaced the sensor every year now for 3 years. This time it was 2 days and code came back
Excellent video. I have a '99 GMC Sierra 2500 that has an intermittent engine light, P0141. I already changed the sensor once myself and it just came back on. It's off at the moment, but if/when it comes on again, now I know how to test it. Funny that twice when I had it in to the mechanic(s) for other things, they couldn't seem to figure it out🙄 Useless...
Very nice video, perhaps I would add to measure the average resistance of the sensor itself, just to prove degradation of the element itself, but normally, there would be no continuity. But how does the control unit of the car knows the element of blast ?
+Lenny Segura Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c
Thank you for sharing .I have 2 question,I tested my 2 white wire from the heater and it read 00 ohms(even when its running),also tested signal and ground and it reads 1 volt,would this be consider as a bad sensor?. I also tested the signal and ground from the ecu and it reads 12.4 volt is this too high?....
Very nicely explained. I had this code and replaced with a new sensor and got the p0420 code now instead of the original code. Any help would be appreciated.
Hi! Excellent video. The last bit touched on what I think my issue is and I could use some advice. '04 Acura TL, getting both P0135 and P0155. I don't have a remote starter, it's all stock as far as I know. Mechanic replaced both O2 sensors, engine code remains. Can you expand on other things like the remote starter example that can cause this kind of multiple, persistent codes? I've checked the fuses. Looked fine but swapped for fresh new ones anyway to no avail. The car has started stuttering during gentle acceleration between 25-30 mph. Could an issue like this be related? Many thanks!
good video, , I have a 2006 Dodge Ram 1500 5.7 hemi,, my check eng. light came on after moving the vehicle out onto the street then shut i off,, it was cold, ,did a scan and both downstream sensors came up on the screen, Bank 1 sensor2 Bank 2 sensor 2,, is it common for both to go at the same time ? and is it just one fuse fuse for bank 1,,and one fuse for bank 2,? meaning,, does the rear sensors have one fuse for both, and same with the front ?
Had to extend my o2 harness for new headers and accidently burnt the wires on my headers, so made a new harness and had idle issues so went and got a new o2 sensor and it fixed the idle issue but now I got this code, didn't even think to check the fuse whichis probably blown from the wires melting and shorting...
When testing the PCM side, is there something wrong if the test light comes on BEFOR starting the engine (no key in ignition)? fyi, my connectors are reversed... male side is wired to the car, female side is wired to the sensor (03-CRV). Tks for any assistance! Great walk through!!!
Great vid easy to understand, I am having a problem with my 95 Jimny Cat light in dash. Light only turns off after driving and exhaust has heated up. I tried your method but my o2 sensor only has one wire going to it. All fuses are good. Any ideas how to test this?
In my Rav4 I have two black, which must be the heater wires. From there I have a blue and a white. How do these correlate to the red and the black/white you tested?
i need your help, I have the same o2 connector as in your video, 4 wire, 2x whites for elements and black/gray for signal. I been getting 0141 and 0138 which points to the downstream o2, and i replaced it and still getting hi volts b1s2. i checked the voltage on the truck side, as in your video, and im getting 13v for the elements and 4v for the signal. my upstream sensor is working fine and no other CEL codes have returned its always 0138 and/or 0141
I have a GM 6.0L. My heater circuit for the upstream both bank 1 sensor 1 and bank 2 sensor 1 keeps blowing the fuse. I understand they both use the same fuse. New 02 sensors all around and converters. To be sure it wasn't any of the sensor I disconnected them all and the heater fuse keeps blowing on ignition start.
Great video, you explain that perfectly. One question though how do you check the blue wires that you have going from the O2 sensor to the PCM to see if they're okay? The power wires I understand how you did that but I was just wondering if the power wires are good how do you check the other two wires going to the PCM? Thank you very much have a good day
good presentation~I went threw the test procedures as you explained-when test light is hooked up to + (positive), connected 02 wire circuit (harness side) test Light, very bright, not blinking, as in your presentation. is this Good👍? or Bad👎?
I think on the second testing on the tip of the oxygen sensor is not enough to say circuit is good because we need to test the wire from the tip of the O2 sensor to the pcm port, I’m I wrong?
If both downstream o2 sensors are removed because of a newly installed turbo kit without cats , would these check engine light codes cause my 18 f150 v8 to go into limp mode at 50% throttle or higher? That's the issue I'm running into
I have a 2006 Ford ranger 4.0 and the downstream O2 sensor is coming on I didn't check the ground wire yet but it doesn't have any catalytic converters on it I bought it with no exhaust pipes and I made my own y pipe it has the upstream O2 sensors on it and I made a spot for the downstream O2 sensor how can I get the downstream O2 sensor to go off and stop sending the code
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This code popped up and I was a little confused when it said O2 sensor heater. But this video clearly explains what O2 sensors do, what where they're located and what the cause might be. I love coming to this RUclips channel.
I have looked at many many videos on my fault code P0037 and this one by far has given me the most in depth information on what may be the problem. Thank U!!!!!
The whiteboard paired with clear explanations made for a great video 🤙🏼 Currently working on a different chassis and I still feel confident enough to diagnose. Thank you.
brilliant explanation for us dummies that know WHAT the code is but not sure HOW to test what's going on! Well done
Don’t often comment, but this was a great instructional video
You tested and trouble shooter this issue like a Real Pro as my mechanic even learned so much!
Excellent skills
Great way to explain what it could look complicated in a simple way ...Excellent Video !!
This guy is a good teacher
Excellent Video!! The drawing and your detailed explanation of what could happen in any given situation with the wiring/sensor were superb
!
It was helpful. Thank you. You were very clear, specific, and stuck right to the issue without going off topic. Great job!
+Andy L Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com:
1aau.to/m/Shop-1AAuto-c
Most Informative video I have ever seen on RUclips for pin-out voltage check of 02 sensors, thank you so much for this info !
We need more people in the world like you great presentation short and to-the-point
Awesome video, broken down so it's super easy to follow along and understand. I like the way this guy explains stuff. Thank you sir.
your drawing helped me understand how the oxygen sensor worked found blown fuse cleared code on cheap obd reader magic thanks for your help.
That’s amazing. Probably is the most proper explanation on RUclips so far I found. Nice work
Super helpful thank you! I need help. Instead of replacing the O2 sensor, I preformed the test like you showed in the video. I found that I do have power to the senor but no pulsating light (4:56) when checking the PCM circuit. No light at all. So, I'm assuming something is broken, as explained in the video at around 5:56. How to I find this broken connection?
Great detailed video, however after going through all of your steps on bank2, I realized that if the O2 heater is good, the O2 sensor would be warm / hot to the touch and include all of your TS steps! BTW, still waiting on that 2000 Chevy Silverado door actuator change w/o opening the effected door! Thanks again!
The best guy to explain trouble codes.. Bravo zulu..
very good video. very concise and to the point. its like, no need to go to automotive school when we got these very informing videos
Great video!
I have a 2011 Impala LS and I can't clear the P0036 and P0141 codes. I replaced the sensor, I have power on the supply side heater and the computer grounds as well. I ohmed out all 4 wires to the ECM and found continuity and no resistance. I believe either the heater is bad in the new sensor(Denso) or the ECM is faulty.
Definitely one of the best videos,, well explained, detailed… It really helps to understand which the possible issues are and how to check them… 👍🏼👍🏼
Super helpful to understand how these work! Much appreciated. Time to hunt down my issue
Finally a video that doesn't leave me scratching my head.... Thank You can you make one explaining how to install door key auto locking device pertaining to the actual key and tumbler. 03 bmw x5?
Awesome video no one has explained and showed this as good as you. Great teacher
absolutely amazing video! great explanation and demonstration on how to properly diagnose it!!! Helped me figure out that my PCM was bad after the i got a o2 sensor heater malfunction
Hi great video. The test light pulsing i assume is ecm doing pwm to heat up sensor?
I am really blown away in how in depth this quick video was packed with valuable in depth information, I learned a lot in this video and I greatly appreciate the instructor in his explanation on what could be the reason this sensor is faulty. Variables that I never thought could be the reason like the after market remote starter.
Check the set of wires under your truck. Believe me i took this advice and when I inspected the wires under my truck where the transmission and the shaft meet. The wiring harness was rubbing so bad that it exposed the wires. Those wires lead to engine. As soon as i got them closed back up problem solved and my truck runs way better than before. Ever since i bought my 2009 suburban this is the best it ever ran. This got rid of this code and the other ones that had to do with faulty cpu code. Believe me an exposed wire can actually make your engine run bad and set off different codes.
All Yours videos means a lot of things! Thank You!
I think this is the best video I have seen on this topic. Thanks.
Youre a man from heaven. Thanks alot for the explanation!!
At last a clear ,precise diagnosis thank you
You're the man I love how you did it on paper good job 👍
Hi! What is the expected current flowing through an O2 sensors heater?
i measure 0.5A only, which would be some benign 7 Watts of heating power.
I measured 4 Ohms on the sensor which should give me more than 3 amps. Or is it pulsed and thus less?
Plus side of circuit is fine,
the cable to the PMU i still have to test.
If the PMU is the problem, what do do?
Does the heater element only turns on while the engine is cold then shuts off, I have a 08 Jeep Patriot and the temperature of the O2 sensor is high even reaching operational temperatures. Would it be bad ECM? Car runs great.
best video about this subject i've seen! Thanks!
Great explanation and diagnosis! More of these diagnosing videos please!
Thanks for your teachings!, And simple break down of the mechanical operation.
Are you suppose to supply 12v directly to the pcm bypassing the load in the circuit? Could have just backprobed and should have had 12v on both heater wires Key on if the circuit was good,
Thank you very much for creating and sharing this video; the 02 sensor theory is simply and clearly explained.
If you dont have access to wiring diagram or forget the colours you can switch sensors side to side and see if code moves same as you would do moving coils to check misfire .
Awesome, very interesting! Thank you for an explanation. I have Chevy Express van and it throws the O2 sensor codes.
Thanks! Question sir, what will be the effects if heater circuit low?
Do you have any videos on diagnosing electrical problems on headlights? My ballasts keep going off
This was simple and well explained. Thanks very much!
03 Tacoma both cats and 02 replaced new plugs air filter all fuses goid is there a relay or something else to get the p0036 code off?
Would the light probe tell you if the wire was cut in half, or just if it's completely broken?
Excellent job man.... Keep it up... You have been a real help understanding the working of O2 sensor 👍👍👍
I have heater circuit code for all the 4 sensors for Ford explorer 09 could there any other reason apart from the possible reason you stated in the video just and what could they be would be a great help to check and diagnose them
Question: What would a resistance test on the two wires that have the same color show?
Very well done video, excellent explanation and showing of diagnosing procedure. Thank you!
Best Display YET!!!!
good video ,, thanks for the info ,,, i have a 2009 mountaineer v8 and my check engine light just came on , when reading the code it show al 4 oxygen sensors are faulty ,, can this be right ?? ,, fuses are good ,, any adviced ? .. thank you .
I have that code in a Golf 4 1.4 (2001). The car fails the enission test and sparks get black very quick. But the sensor ( 5 wires) was already replaced. I tested the resistance of the heater and the voltage both with a multimeter. Resistance was about 4 OHM and voltage was 12 volts.
Obviously, the engine is running rich. CO is 5 percent .
I replaced nearly everything, but sparks get equally black very soon.
First emission test in january 2024 showed 10 % carbon monoxide (engine had no emission problems in january 2022)
Oxygen sensor and catalytic converter were then replaced.
Second emission test showed the 2.4 % carbon monoxide. Better but far from good.
Then temperature sensor, MAP (engine has no MAF) and ECU were replaced and electric throttle body was cleaned.
Sparks were still black. Then fuel regulator and throttle were replaced. Sparks still black.
Third emission test in octobre showed 5-6 % carbon monoxide.
A live test shows an air/fuel-ratio below 14 most of the time.
How common is it, that new oxygen sensors do not work properly? Should I get a new oxygen sensor?
Thanks for your testing procedures,great video
What if you get all the O2 codes like you said at the end? What would you check first. Fuses were good in both panels.
How do you diagnose a p0133? I have a Jeep compass. Can't find fuse locations if it even has them. Pretty sure it wouldn't be and exhaust leak because b1s1 is right on top of the manifold. I've replaced the sensor every year now for 3 years. This time it was 2 days and code came back
Excellent video. I have a '99 GMC Sierra 2500 that has an intermittent engine light, P0141. I already changed the sensor once myself and it just came back on. It's off at the moment, but if/when it comes on again, now I know how to test it. Funny that twice when I had it in to the mechanic(s) for other things, they couldn't seem to figure it out🙄 Useless...
Very nice video, perhaps I would add to measure the average resistance of the sensor itself, just to prove degradation of the element itself, but normally, there would be no continuity.
But how does the control unit of the car knows the element of blast ?
Bro Thank You Very Much This Def. Helped Me Understand What Is Going On With My Vehicle Now I Can Def. Stop Getting Ripped Off At The Damn Mechanics !
+Lenny Segura Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c
Thank you for sharing .I have 2 question,I tested my 2 white wire from the heater and it read 00 ohms(even when its running),also tested signal and ground and it reads 1 volt,would this be consider as a bad sensor?.
I also tested the signal and ground from the ecu and it reads 12.4 volt is this too high?....
If the Oxygen sensor is fairly new, changed all sensors a few months back, what could possibly be the reason for this downstream sensor failure?
Informative video thanks 👍🏼👍🏼👍🏼
Anytime Samuel! We are glad you enjoyed it.
Very nicely explained. I had this code and replaced with a new sensor and got the p0420 code now instead of the original code. Any help would be appreciated.
Your cat is bad. Sensor is reading the same before and after the cat
I have an aftermarket remote start system & getting these codes. What would cause the the codes? Improperly wired starter system?
This is a good information to know the O2 how to check it think you very much Brother
Best video so for I have seen on utube. Excellent explanation
Do you have a video on a p0138 code, high voltage from bank 1 sensor 2? Thank you
Super informative video..need to check my issues now!
Hi! Excellent video. The last bit touched on what I think my issue is and I could use some advice.
'04 Acura TL, getting both P0135 and P0155. I don't have a remote starter, it's all stock as far as I know.
Mechanic replaced both O2 sensors, engine code remains.
Can you expand on other things like the remote starter example that can cause this kind of multiple, persistent codes?
I've checked the fuses. Looked fine but swapped for fresh new ones anyway to no avail.
The car has started stuttering during gentle acceleration between 25-30 mph. Could an issue like this be related?
Many thanks!
good video, , I have a 2006 Dodge Ram 1500 5.7 hemi,, my check eng. light came on after moving the vehicle out onto the street then shut i off,, it was cold, ,did a scan and both downstream sensors came up on the screen, Bank 1 sensor2 Bank 2 sensor 2,, is it common for both to go at the same time ?
and is it just one fuse fuse for bank 1,,and one fuse for bank 2,? meaning,, does the rear sensors have one fuse for both, and same with the front ?
This helps me with a p0130, thank you 🙏
Had to extend my o2 harness for new headers and accidently burnt the wires on my headers, so made a new harness and had idle issues so went and got a new o2 sensor and it fixed the idle issue but now I got this code, didn't even think to check the fuse whichis probably blown from the wires melting and shorting...
When testing the PCM side, is there something wrong if the test light comes on BEFOR starting the engine (no key in ignition)? fyi, my connectors are reversed... male side is wired to the car, female side is wired to the sensor (03-CRV). Tks for any assistance!
Great walk through!!!
+Deborah Mcgiffin Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c
Great vid easy to understand,
I am having a problem with my 95 Jimny Cat light in dash. Light only turns off after driving and exhaust has heated up. I tried your method but my o2 sensor only has one wire going to it. All fuses are good. Any ideas how to test this?
Great job as it was very comprehensive.
+mike aho Thanks for checking us out! 1AAuto.com
This video was amazing thanks for sharing your knowledge and experience
In my Rav4 I have two black, which must be the heater wires. From there I have a blue and a white. How do these correlate to the red and the black/white you tested?
i need your help, I have the same o2 connector as in your video, 4 wire, 2x whites for elements and black/gray for signal. I been getting 0141 and 0138 which points to the downstream o2, and i replaced it and still getting hi volts b1s2. i checked the voltage on the truck side, as in your video, and im getting 13v for the elements and 4v for the signal. my upstream sensor is working fine and no other CEL codes have returned its always 0138 and/or 0141
do the 02 sensor better to buy it from dealership or any aftermarket sensor will work?
Thanks for this video! It was a big help!
Glad to assist Chuck!
I have a GM 6.0L. My heater circuit for the upstream both bank 1 sensor 1 and bank 2 sensor 1 keeps blowing the fuse. I understand they both use the same fuse. New 02 sensors all around and converters. To be sure it wasn't any of the sensor I disconnected them all and the heater fuse keeps blowing on ignition start.
Its grounding out somewhere. Check for broken wire touching frame or a wire that has plastic worn away allowing it to touch frame
Great video, you explain that perfectly. One question though how do you check the blue wires that you have going from the O2 sensor to the PCM to see if they're okay? The power wires I understand how you did that but I was just wondering if the power wires are good how do you check the other two wires going to the PCM? Thank you very much have a good day
good presentation~I went threw the test procedures as you explained-when test light is hooked up to + (positive), connected 02 wire circuit (harness side) test Light, very bright, not blinking, as in your presentation. is this
Good👍?
or Bad👎?
Did you figure this out ?
What is a drag test? At 3:28 you mentioned it; thanks!
Excellent demonstration!
You are the man thank you that helped like 180%…. Confusion over.💯👍🏾
Excellent demisntratino on white board. Keep up the good work
could a break in the signal wires cause this p0141 code?
I think on the second testing on the tip of the oxygen sensor is not enough to say circuit is good because we need to test the wire from the tip of the O2 sensor to the pcm port, I’m I wrong?
If both downstream o2 sensors are removed because of a newly installed turbo kit without cats , would these check engine light codes cause my 18 f150 v8 to go into limp mode at 50% throttle or higher? That's the issue I'm running into
Please I need confirmation is bank 1 the left catalytic converter or the right ?
good video thanks! got no ground signal 2003 honda pilot..fudge ..idk where to go next..
My 2.4l has two wire O2s . Shows a heater circuit code? Checking the fuse next.
I have a 2006 Ford ranger 4.0 and the downstream O2 sensor is coming on I didn't check the ground wire yet but it doesn't have any catalytic converters on it I bought it with no exhaust pipes and I made my own y pipe it has the upstream O2 sensors on it and I made a spot for the downstream O2 sensor how can I get the downstream O2 sensor to go off and stop sending the code
Super quality video. Thank you so much
this is what i was really looking for thank you very much
How do I test the wiring for my o2 sensor of my 2008 honda pilot
NYC Corvette
1 second ago
Hello, if the heater element ion the O2 sensor is bad would it show the proper voltage when tested with a odbii scan tool?
Not likely. If the heater is bad it is usually a short, therefore a broken circuit, and the PCM will detect and report the code.
Is bank 1 sensor 2 on the driver side? Or passenger side?