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Testing an afr/o2 heater circuit – Auto Repair Chat

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Another Quick Tip Tuesday! In this quick tip I show you how to test an AFR/O2 sensor heater with out a scan tool just using a test light. Just remember in some cases it is necessary to shut the vehicle off and start it back up. -Enjoy!
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50 thoughts on “Testing an afr/o2 heater circuit”
  1. Avataaar/Circle Created with python_avatars Joseph Ellis says:

    Not a 2015 Subaru Impreza. Your quick tip sucks! Downvote.

  2. Avataaar/Circle Created with python_avatars Walker Not Texas Ranger says:

    You're the shyt Eric O. 💩

  3. Avataaar/Circle Created with python_avatars raul garcia says:

    Will you ever tackle (and video) a 5-wire afr sensor?

  4. Avataaar/Circle Created with python_avatars Atetus94 says:

    How about 5 pin VAG (VW, Seat, Audi, Skoda) lambdas? There i no 2 same colors wires

  5. Avataaar/Circle Created with python_avatars Michael Pavan says:

    Eric the tips you provide a great and the videos are even better. I am a 20 year mechanic w/Toyota but I watch the videos on all makes and models because your explanations on the theory and operation are thorough and folks can understand the process we go through each day. I even have new trainees look at some of them because seeing is believing and you do a great job. Keep up the good work and best wishes from down south a bit in Maryland.

  6. Avataaar/Circle Created with python_avatars Dale VanDerMeer says:

    Easy peasy

  7. Avataaar/Circle Created with python_avatars Melvin Barrios says:

    I know this comment is not about the matter of this video.. ,but could you some day make a video solve the vibration on a chevy silverado
    Thank you.

  8. Avataaar/Circle Created with python_avatars Joachim Johan says:

    AWSOM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  9. Avataaar/Circle Created with python_avatars Sm Ms says:

    👍 SWEEET VID 🚹

  10. Avataaar/Circle Created with python_avatars 426 HEMI says:

    Awesome tip!  Just got a box full of harnesses and various lamps, solder, and new pencil iron – gotta make my test lights!

  11. Avataaar/Circle Created with python_avatars 1970chevelle396 says:

    Great to see you test that. Most people just replace the sensor without testing it. I had one mini van I worked on a while back. The motor mount was broken and it pulled on the wires breaking one wire inside of the insulation causing that heater circuit code.

  12. Avataaar/Circle Created with python_avatars DIY Steve says:

    Valuable information! Thanks again Eric!

  13. Avataaar/Circle Created with python_avatars Paul Boylan says:

    Mr O what would be a good AUTEL model for a DIY guy with family and friends for customers and do have a good time watching your shows THANK you

  14. Avataaar/Circle Created with python_avatars Ricardo Martinez says:

    Hey Eric thanks so much for this video,wonderful job! I wanted to ask you about my own Toyota Camry it's in need of its timing belt and I purchased the Dayco timing belt and water pump kit. I know from other videos you've mentioned that this isn't the best kit to get and you've recommended the Aisin brand kit. I'm unable to return the Dayco kit so the question is do you recommend using any of the components at all? I'd like to change the timing belt at the very least. do you recommend switching out the original water pump for the Dayco pump or just do the timing belt? what's your recommendation if all I have is the Dayco kit. Thanks

  15. Avataaar/Circle Created with python_avatars Noel Hernandez says:

    Cool vid. I just worked on a case today '13 Genesis Coupe with same code. Did same test. Turned out Ecm went bad. Did not control heater properly. Thanks Eric O. for all the good tips and videos.

  16. Avataaar/Circle Created with python_avatars mark lavrack says:

    Why wouldn't the computer continually monitor the air/fuel ration of the engine? Just when the car first starts up?

  17. Avataaar/Circle Created with python_avatars Marty B says:

    Nice job, I have only one problem, your links for tools dont have the proper items in the description. Outstanding thou. Keep up the awesome work you do! God Bless

  18. Avataaar/Circle Created with python_avatars Billy Yoder says:

    Thank you Eric O. 👍Good job. Appreciate your videos.

  19. Avataaar/Circle Created with python_avatars pc zapp says:

    The next AFR you get with a good heater, but failed output, could you do a video
    with the Autel & Pico, so we get an idea about current output & how to test AFR's

  20. Avataaar/Circle Created with python_avatars kd9bwi says:

    Hey Mr. O, couldn't find out how to message you. Got a question. Can I troubleshoot missfires using O2 readings? I'm using torque pro and an Elm32 as I didn't have a fancy scan tool yet, and my '99 GMC Sonoma has been missfiring. No codes yet but the missfire is noticible, engine shakes and so does my stick, you can hear it missfire sometimes also. O2 data shows voltage drop spikes in primary O2 voltage on and off idle, sometimes almost down to 0v. I'd send you a screenshot of the data, bit again, can't find out how to message you. If I'm correct, I think I have a clogged or bad fuel injector. Engine vin is 4 if that helps any. Thanks!

  21. Avataaar/Circle Created with python_avatars Tracy Goodlett says:

    Very good info. Thanks for making these videos

  22. Avataaar/Circle Created with python_avatars Model 3 Fan says:

    No brake clean?!? So disappointed.

  23. Avataaar/Circle Created with python_avatars mdcorman D says:

    that rock and roll playing in the background could hear a word you said you head bangin mechanic AFR should be call AFRT in this case if you get me meaning.

  24. Avataaar/Circle Created with python_avatars Mark Chidester says:

    Muesday

  25. Avataaar/Circle Created with python_avatars Dave Nowicki says:

    you have been using the Autel alot recently. any reason why? knowing what you do with yrs of experience, what would be your scan tool if you could only afford one?

  26. Avataaar/Circle Created with python_avatars Kenneth says:

    I'm not familiar with the AFR circuit name? I know cars have oxygen sensors to regulate the fuel air ratio. Why did the test light go out when the engine was raised off idle again?

  27. Avataaar/Circle Created with python_avatars Kevin Collins says:

    Those test lights come in handy, made a mess of them after watching.

  28. Avataaar/Circle Created with python_avatars Kirk Abrahamson says:

    Timing is spot on Eric O. Video posted 7 hours ago so just scraped in to being tech tip Tuesday here in Oz. Love ya work

  29. Avataaar/Circle Created with python_avatars Rick B says:

    I'm having a Hell of a time keeping track of what day it is watching this channel ?

  30. Avataaar/Circle Created with python_avatars scuba422123 says:

    I didn't see the aes wave term and lead kit in your store so I bought a coffee cup

  31. Avataaar/Circle Created with python_avatars Duncan Mac says:

    Thanks for the video.

  32. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Good video eric o

  33. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Lol quick tip Tuesday on a Friday whoot

  34. Avataaar/Circle Created with python_avatars Baxrok2 says:

    Quick and very helpful tip! Thanks Dr. O!

  35. Avataaar/Circle Created with python_avatars WTF Man! says:

    🙂 Sweet tip!

  36. Avataaar/Circle Created with python_avatars scuba422123 says:

    eric…..I get the testing…. and a good tech needs to know…. but in the real world on a Toyota blow a sensor in and move on! I have worked at a chevy dealer 25 years and independent for 9 years

  37. Avataaar/Circle Created with python_avatars Louis Reed says:

    Thanks for the tip Eric.

    Question about the Vantage. Do you like it because it's faster? Only asking because I have a Verus Edge but I find the vantage handy if just doing electrical.

  38. Avataaar/Circle Created with python_avatars Rick D says:

    U look like ur really having fun: )

  39. Avataaar/Circle Created with python_avatars zx8401ztv says:

    So the sensor only started to work once the engine was hot.
    O.c heater, how dare it die :-D.

  40. Avataaar/Circle Created with python_avatars MBS says:

    Er…um…uh…so the heater for the A/F sensor is open circuited and it needs a new A/F sensor…right?

  41. Avataaar/Circle Created with python_avatars The SearcherMan says:

    Great video. Hey, I am retired and going to look into getting a project antique tractor to fiddle with. If you were going to replace your model H, what would you be looking for? Thanks.

  42. Avataaar/Circle Created with python_avatars Richard Gill says:

    Great. I get to use my homemade SMA test lights. On my way to get ice cream now.

  43. Avataaar/Circle Created with python_avatars Daren Kilminster says:

    I really enjoy your informative shows please keep up the good work

  44. Avataaar/Circle Created with python_avatars wrr2112 says:

    When are you going to make Part 4 of "Another day at the shop" video?

  45. Avataaar/Circle Created with python_avatars R. E. Hill says:

    Bundle these short ones together, just annoying to get notifications for something that lasts less than five minutes…