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Thread: Stubborn Check Engine Light

  1. #11
    Old Timer sipafz's Avatar
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    Check the evap. hoses! They dry rot and leak over time.

  2. #12
    Knows a Thing or Two Primo82's Avatar
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    Quote Originally Posted by sipafz View Post
    Check the evap. hoses! They dry rot and leak over time.
    Yea, I looked at his profile after my last post. Looks like this is happening on a 90s TJ. Dry rot is definitely likely.

  3. #13
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    Gas cap was first fix. Obviously didnt work. Thanks for the vote of confidence.

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  4. #14
    Old Timer Snboarder113's Avatar
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    Key on/off/on/off/on see if the dash will Show you a code.

    Smack your gauge cluster inwards, they have crappy connection design.

    Unplug and clean harness connections at computer above the battery. Ensure seated properly.


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  5. #15
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    If anyone cares, this was my stepwise process:

    1. Idle air module/valve.

    2. Purge solenoid valve

    3. Vapor canister

    4. Had a dry rotted elbow from VC to intake.

    At this point, none of the fixes got rid of the light. My last choices were horses (they were all good), MAP sensor, and new PCM.

    5. Replaced MAP sensor. Light immediately went off.

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  6. #16
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    dash lite for vapor

    Quote Originally Posted by welwillie80 View Post
    I've cleared them numerous times. I had a different guy use his scanner and it finally came back as evap. I replaced the purge solenoid and still on. Next step is vapor canister.

    Sent from my SM-G975U using WAYALIFE mobile app
    I know its a little late but the same thing was driving me crazy. I have a scanner and I would clear the code but down the road it would come on again. Theres a brake line looking thing that goes back to the gas tank that was rusted right off the tank. Replaced the line and light never came on again.

  7. #17
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    Quote Originally Posted by bigwheel53 View Post
    I know its a little late but the same thing was driving me crazy. I have a scanner and I would clear the code but down the road it would come on again. Theres a brake line looking thing that goes back to the gas tank that was rusted right off the tank. Replaced the line and light never came on again.
    The first and easiest method for clearing the check engine light is driving and time. ... If the check engine light is still on after three days, your problem may not have been fixed or you may need to try some of the methods below to reset it.

  8. #18
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    Lightbulb

    Quote Originally Posted by welwillie80 View Post
    Gas cap was first fix. Obviously didnt work. Thanks for the vote of confidence.

    Sent from my SM-G975U using WAYALIFE mobile app
    So first things first, pull over (as soon as it's safe) and make sure your gas cap is on tight. If this was indeed the trigger, your check engine light should go off within 10 or 20 miles once you're back on the road.

  9. #19
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by ItayGrubman View Post
    The first and easiest method for clearing the check engine light is driving and time. ... If the check engine light is still on after three days, your problem may not have been fixed or you may need to try some of the methods below to reset it.
    3 days isn’t enough time. Most check engine lights require 40 engine heat cycles for them to go away once set. This goes for type A and B codes. If the failure doesn’t repeat within those cycles then it will self clear.
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  10. #20
    Knows a Thing or Two monstrousmac's Avatar
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    Quote Originally Posted by welwillie80 View Post
    I've cleared them numerous times. I had a different guy use his scanner and it finally came back as evap. I replaced the purge solenoid and still on. Next step is vapor canister.

    Sent from my SM-G975U using WAYALIFE mobile app
    Don't waste your time on the EVAP system I get the code every 2-3 months or Gas Cap Light. I clear the code and it stays off for a few months. It seems to be a problem with Jeep vehicles. The code is P0456. I started to get it when my vehicle was about 2 years old and now it is 10 Years old with 200,000 miles on it. It is the 3.8 Liter. The local dealership mechanic even told me not to waste my time, it is like chasing a rabbit down a rabbit hole.
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    Last edited by monstrousmac; 03-06-2020 at 03:22 PM.

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