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360 Check engine light with P0152 error code Front o2 sensor high voltage

Discussion in '360/430' started by Scottrx7tt, May 29, 2025.

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  1. Scottrx7tt

    Scottrx7tt Karting

    Oct 5, 2023
    228
    Lenoir City, TN
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    Scott Williams
    #1 Scottrx7tt, May 29, 2025
    Last edited: May 29, 2025
    I just swapped out my f1 actuator because it was leaking transmission fluid through the seals. I took the muffler off to be able to reach everything. Once I got it back together, I got the P0152 error code, which if the front o2 sensor(left) high voltage. I pulled out my trusty thinkdiag code reader and graphed the voltage on the left bank. I found that the voltage has spikes up to Supposedly 80 volts using the reader. I guess one would assume either a wiring issue or a faulty o2 sensor. I have one coming, and will also clean the connector before hand. Anyone else ever see this kind of spike?
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  2. Qavion

    Qavion F1 World Champ
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    Ian Riddell
    #2 Qavion, May 29, 2025
    I can’t imagine an 80 volt spike coming out of a 5 or 12 volt circuit. Perhaps some kind of induced voltage coming from a collapsing nearby magnetic field?
     
  3. Scottrx7tt

    Scottrx7tt Karting

    Oct 5, 2023
    228
    Lenoir City, TN
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    Scott Williams
    #3 Scottrx7tt, May 30, 2025
    yeah, i dont get it. I didnt mess with anything on that side of the car. I do have a new sensor on order and hopefully that takes care of it. I just found it weird that it would spike then go to normal reading, like there is a short or something. The only thing that would produce anywhere close to that voltage would be a coil pack, but there are none close.
     
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  4. yelcab

    yelcab F1 World Champ
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    Mitchell Le
    #4 yelcab, May 30, 2025
    The ThinkDiag is a cheap clone of a Launch X431 Pros Mini which is a cheap clone of a more expensive Launch. Those spikes are the result of sampling errors when the car is running and alot of data is on the CAN bus. Those spikes make the graphing functions useless and make the interpretation of the remaining data difficult.

    As for your P0152 error, I just went through the same error code and then a P0132 code (the other bank). It took months. What I can tell you to do is:

    1. Go back through your work. You must have removed the exhaust to get to the actuator. Make damn sure all exhaust connections are very nice and very tight.
    2. Go back through the car where you have touched, and make sure all your ground points are reconnected to the right places nice and tight.

    Your O2 sensor was good before, it is still good now.
     
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  5. Scottrx7tt

    Scottrx7tt Karting

    Oct 5, 2023
    228
    Lenoir City, TN
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    Scott Williams
    #5 Scottrx7tt, Jun 11, 2025 at 3:13 PM
    i am thinking that i may have cracked the drivers side exhaust manifold while removing the exhaust. I had to wail on the aftermarket exhaust to get it off with a 5lb sledge hammer.....long story. Ordered a smoke machine to troubleshoot. Not really wanting to go with aftermarket headers as i dont want any additional noise. Anyone have a good 99 exhaust manifold they would like to part with?
     
  6. yelcab

    yelcab F1 World Champ
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    #6 yelcab, Jun 11, 2025 at 5:24 PM
    5-lb-sledge? Holy crap. That is not going to help.
     
  7. RedNeck

    RedNeck F1 World Champ
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    #7 RedNeck, Jun 13, 2025 at 9:20 AM
    So what ended up being your root cause of both of those codes? Were you able to get them fixed?
     
  8. yelcab

    yelcab F1 World Champ
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    #8 yelcab, Jun 13, 2025 at 9:22 AM
    In one case, it was a missing wire ground at the ECU on the right.
    In the other case, a leaky exhaust between header and cat converter.
     
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  9. Scottrx7tt

    Scottrx7tt Karting

    Oct 5, 2023
    228
    Lenoir City, TN
    Full Name:
    Scott Williams
    #9 Scottrx7tt, Jun 13, 2025 at 10:59 AM
    I tried everything, heat, penetrating oil, etc. Even cut some slits in the pipe...still had to tap on the muffler piping to get if off. It wasnt my first choice. I have the OBX exahust and got it when it was cheap, so no big deal. The coupling did not have slits in the pipe, so when the clamps were tightened, it would not flare back out to take it off. Just got a few dents on the exhaust.
    I got my smoke tester today, so will check for leaks. I guess there is a slight possibility that the leak is between the manifold and the Cat. Regardless, the exhaust will have to come back off. Hoping it does not fight me again if thats the case.
     

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