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In this video we have a look at a 2008 Jeep Wrangler that has codes P0038 and P0052 stored in it. The other shop has already replaced the O2 sensors and the problem remains! Let's see if we can track this down in a timely fashion. -Enjoy!
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49 thoughts on “Jeep wrangler: o2 heater codes what to do when it’s not the o2 sensor!?”
  1. Avataaar/Circle Created with python_avatars kenny Perkins says:

    What spray cleaner do you recommend for green crustys and what is the spray film do you use on wiring?

  2. Avataaar/Circle Created with python_avatars Shaun Mace says:

    Eric my mechanic saying that my PCM is bad. How often has anybody replaced one on an 07 JK

  3. Avataaar/Circle Created with python_avatars Mark Capestro says:

    OUTSTANDING video! I am not being sarcastic. This video shows the frustrations of troubleshooting AND the troubleshooting was accurate. My daughter's jeep is doing the same exact thing. W those wires that close to a heat source, I can see how it baked the wires. … great video!!!

  4. Avataaar/Circle Created with python_avatars Danny Cole says:

    Look at you using the power probe. I didn't like them at first. But on Thursday it was a easy quick check on a door ajar switch on a f150.

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

    Shame on how bad that o2 sensor was installed Hopefully in the future the Bung can Be fixed good work Eric O and yeah hacks make good mechanics like us look bad @SouthMainAutoRepairLLC

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

    There's your problem lady you Broke All your grounds Good Video As Always Eric O @SouthMainAutoRepairLLC

  7. Avataaar/Circle Created with python_avatars August Wilson says:

    Love the fact that you put it all on camera, makes me feel better about making mistakes when I'm getting started.

  8. Avataaar/Circle Created with python_avatars John Gallano says:

    How do you acquire those schematics and pictures?

  9. Avataaar/Circle Created with python_avatars Prasad Sameera says:

    Trust me I'm a Mechanic

  10. Avataaar/Circle Created with python_avatars Craig White says:

    I usually use the KISS method, keep it simple stupid!

  11. Avataaar/Circle Created with python_avatars BeautyAndTheBeardCo says:

    Where was this ground located?? Driver or passenger side?

  12. Avataaar/Circle Created with python_avatars Will Golpe says:

    Its a Jeep, theres your problem lady!

  13. Avataaar/Circle Created with python_avatars bcorpuz83 says:

    Very helpful iam on the same problem will check that ground tomorrow. Don't have a fancy scan tool like you do, so great full you put out this video.

  14. Avataaar/Circle Created with python_avatars David Bennett says:

    Great video. I'm having a problem with 2 & 4 has no spark. Can u help me out ?

  15. Avataaar/Circle Created with python_avatars Ken H says:

    Eric, can you tell me what else grounds to g104 other than the 02 sensors

  16. Avataaar/Circle Created with python_avatars Barney Longacre says:

    Thanks and I am starting to believe … I CAN do it too!

  17. Avataaar/Circle Created with python_avatars Jeff Kitterman says:

    curious here… what else on the vehicle would malfunction without that group of groundwires attached properly…??? AC??

  18. Avataaar/Circle Created with python_avatars George Winn says:

    Thanks for the video. I have a similar issue on my 2005 Chrysler T&C (3.8L) with CE light on with P0032 code. Initially, I thought it was just a bad O2 sensor so I replaced it. That didn't work; I tried 2 other brand names based on internet blogs; that didn't work. After watching your videos, I decided to perform various electrical tests. It turned out that the sensor is not getting the power from the PCM (only reads 9V, not 12V). Do you know which pin/wire from the PCM is the wire to the sensor? Is it ok to run a separate power line directly from the battery to the O2 sensor? Thank you.

  19. Avataaar/Circle Created with python_avatars don lum says:

    Good job

  20. Avataaar/Circle Created with python_avatars sforist Forist says:

    You sir are the Man Thanks!

  21. Avataaar/Circle Created with python_avatars Eugene Enslow says:

    Excellent video

  22. Avataaar/Circle Created with python_avatars Jeffery Powell says:

    its in an ex pipe chase the threads

  23. Avataaar/Circle Created with python_avatars Jeffery Powell says:

    why didnt that shop chase the threads

  24. Avataaar/Circle Created with python_avatars Jeffery Powell says:

    good to see a pro at work

  25. Avataaar/Circle Created with python_avatars Jeffery Powell says:


  26. Avataaar/Circle Created with python_avatars Jeffery Powell says:

    number are ok i dont what your talking about so im learning

  27. Avataaar/Circle Created with python_avatars 9 Life T.V says:

    The Money Light 😭

  28. Avataaar/Circle Created with python_avatars Matt Evans says:

    I just wanted to give a shout out to South Main. I used this video to fix my P0032 Bank one sensor one heater circuit high on my 2002 Grand Cherokee 4.7 v8. I don’t have a scan tool but was able to use my muti-meter to find the issue. I hade 13 volts on both heater wires!? Based on what learned I was able to figure out that all the wires for the oxygen sensor had melted together. The dude that installed the motor had run the harness between the exhaust manifold and the motor mount instead of under the motor mount.

  29. Avataaar/Circle Created with python_avatars Frank Brunner says:


  30. Avataaar/Circle Created with python_avatars Bass Hunter says:

    Great detective work, Eric! That's the "trouble" with being honest. We tend to forget that others aren't necessarily! Not surprised that it was a ground issue. I'm convinced that 70% of electrical issues are due to ground issues (just my experince). 👍

  31. Avataaar/Circle Created with python_avatars uglysteve1 says:

    Ground 104-Daht-daht -dahhhh

  32. Avataaar/Circle Created with python_avatars Joe Vreeland says:

    So-o-o … did you tell the owner of the damage done by the other shop? Idiots with wrenches should be knee capped … just sayin' ………

  33. Avataaar/Circle Created with python_avatars Dr Loch says:

    This is like back from the future. You did one of these in the future except it had more grease underneath.

  34. Avataaar/Circle Created with python_avatars Robert Davis says:

    I was always taught by my father to turn the bolt CC into the threaded casting until you feel and hear the " CLICK". Then turn the bolt CW, threading it in every time. People get in such a darn hurry. Good video Doctor O.

  35. Avataaar/Circle Created with python_avatars Jacob E says:

    Hey Eric o, I just watched your future video. It’s a bad ground.😂😂

  36. Avataaar/Circle Created with python_avatars Charles Keenom says:

    Good job I like how you went about diagnosing the problem thank you Eric CK

  37. Avataaar/Circle Created with python_avatars Jim Bob says:

    My 05 jeep 5.7 is saying all 4 heater circuits are low. Weird thing is it drives fine most of the time but then really rough idle, stalling. Seems odd all 4 go bad at the same exact time. PS good video definitely subscribed.

  38. Avataaar/Circle Created with python_avatars John Long says:

    You know your stuff. Great video. Thank you. Your customers are lucky to have you as their mechanic.

  39. Avataaar/Circle Created with python_avatars L C says:

    Man I wish I had this man help me on my Jeep right now. It’s been over a year now and 3-4 thousand dollars spent. Initially when all the codes popped up(p0032, 0038, 0052, 0058), I thought how the hell could all these codes pop up at the same time if it were the 02 sensors? I thought that it’s something deeper then 02 sensors. Potentially the PCM. Not the catalytic converter because I had just replaced it 2 years prior. Thought it might be a short in the engine wiring harness somewhere maybe. I cleaned all the ground points after doing lots of research(g104, etc etc), sprayed electrical spray all over the place. Nothing. Decided to replace all 4 oxygen sensors with NGK/NTK. All the codes returned. Cool. Started to look around to mechanics I don’t even know and trust to ask them to see if they could figure it out. Bunch of lowlives at a shop told me it’s the pcm. Paid them to tell me something I already suspected but needed to be SURE by someone licensed and experienced before I spent close to 1700$. Go ahead and spend that amount of money- switch out the pcm. Codes came back:) this time go to another shop that has old wranglers out front— I explained everything and asked for them to check the WIRING for shortages etc. They tell me it’s a clogged catalytic converter…… one, replace it. Codes come back. I’m pissed. Everything I already knew, everything I explained to the mechanics, paid them, they just one by one cancelled everything out I already said and took my money for nothing.

    Finally I’m at this mechanic who is top notch. He knows what he’s doing trust me. He told me 3 months ago when I asked him to test the wiring that there’s a big oil leak at the valve cover which I knew about. Valve cover gasket set. He also tells me at that time that he checked the voltage throughout from pcm etc and said because of the oil leak it caused contamination in the wires and that he can rewire them but before doing so we need to fix the culprit or it’ll happen again which was fixing the gasket. Ok. Makes sense. Main issue I thought it could be a year ago. The wiring located at the back of the engine that you can’t reach without tearing things apart. Bought a gasket. Brought my Jeep to him yesterday.

    He just called me. He’s telling me he fixed the gasket that was really bad leaking badly etc that’s fixed. He said while it was off he checked the wiring and said all of it was in good condition and there’s no shortages found throughout. He’s saying it’s the 02 sensors!!! And I’m thinking how can this be??? I replaced all of them. Not only that— how can all 4 of them go bad at once? Not only that— I put NGK in which is basically OEM for my Jeep? He says no you need to get FACTORY/ORIGINAL from dealership. I’m saying the dealership will give me the NGK!?!? NGK IS WHAT I INSTALLED A YEAR AGO AND IT DIDNT FIX THE ISSUE! He’s not listening to me. Maybe he is right though.

    Could it be that MOPAR will fix the issue?

    I’m so fed up with all of this now after a year, thousands of waisted dollars, a horrible running Jeep, thousands spent in gas money, stress, etc etc.

    Now I’m picking my Jeep up tomorrow not knowing how it will drive and if the gasket was even worth having done. I had it done because he told me the wiring needed to be rewired due to oil contamination and fixing the gasket needs to be done before doing it— this is why I had this done. Now he’s telling me that he can’t find anything anywhere and that it’s the 02 sensor heater circuit 100% and that I need to buy them from the dealer.

    Won’t the dealer just give me NGK? Doesn’t MOPAR make NGK and vise versa and just charge you more etc? I’m going to try buying ONE MOPAR 02 sensor tomorrow and switch one out to see what happens………I’m beyond fed up with dealing with mechanics who have no clue what they’re talking about. Advising me to replace parts I already suspected and mentioned and taking my money to finding out that was even the cause? It’s the same thing over and over now for 3-4 times in a year and the problem still isn’t fixed.

  40. Avataaar/Circle Created with python_avatars WorkingTheLure says:

    Hi, I have a question I tried to give you a call at your shop but it said you were unable to talk because of the full time business. I’m shopping for a wrangler and I found one that is a 2007 with this problem and only has 76k miles on it they are asking 7k for it is it worth the buy to have it fixed or is this costly to fix and will there be further issues with it. Thanks

  41. Avataaar/Circle Created with python_avatars Mister Kelley says:

    Better question, where do you find those wiring diagrams reliably. I've seen multiple sites that look sketchy. I'd be willing to go up to $60 for a good service manual, but the 200 i've seen is ridiculous (I bought a used 2012 jk unlimited, cant find the FSM)

  42. Avataaar/Circle Created with python_avatars Dave Arslanian says:

    Mr O, you should make an intro to car electronics testing for us home mechanics that get stumped by this stuff. Ive got a multimeter but no clue. ;(

  43. Avataaar/Circle Created with python_avatars Jack Swager says:

    Your method was good education on circuits, thanks.

  44. Avataaar/Circle Created with python_avatars John Morin says:

    Hey Boss that was some fine deductions, "WATSON" we never stop learning even years after you already Fixed it…… 1000 points for YOUR Genious …ness that took some logical deductions Watson GREAT _ Good BETER and Best AWARD… for sure

  45. Avataaar/Circle Created with python_avatars Eddie Mendez says:

    Hope you answer. Would this cause misfire? Thanks

  46. Avataaar/Circle Created with python_avatars Lawrence Lamson says:

    No APOLOGIES! U r h u m a n!

  47. Avataaar/Circle Created with python_avatars GuRjOT pLaYs says:

    Hey do you know if the egr valve circuit shared the same g104 ground location??