04 Jeep Liberty renegade 3.7 missfire

Discussion in 'KJ General Discussion' started by 416kJ, May 21, 2020 at 11:32 AM.

  1. 416kJ

    416kJ New Member

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    Hello I recently bought my first Jeep ever an 04jeep Liberty renegade edition 3.7
    However I’m having a miss-fire issue
    Hopefully someone can help me out
    Here is the code ,
    (P2302) iginition coil A (secondary circuit)
    Can someone please chime in and help me pinpoint which coil I should be looking at
    Either in the driver side or pass side
    (Link to picture of actual scanner code photo)
    https://ibb.co/C02tf8Q


    my other code is :
    (p0157)
    o2 sensor circuit low (bank2 sensor2)
    I know my exhaust need to be redone just wasn’t sure which 02 I need to replace if anyone can chime in on that as well I’d be very appreciative of that , :) tryed to search but I’m not to familiar with this site yet
    (Link to picture of actual scanner code photo)
    https://ibb.co/FW1b8vs
     
    LibertyTC likes this.
  2. 416kJ

    416kJ New Member

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  3. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    Welcome to the forum !
    Your photo shows 1 of 3 codes what's the other code?
    P2302: https://www.obd-codes.com/p2302
    Marlon from assembly plant also recommended Checking the wires going to ignition coil #1. See if they're nice and tight and not frayed or rubbing against something.
    See post 2: https://www.jeepkj.com/threads/error-code-p2302.33345/

    Anyways here is the firing order.
    [​IMG]
    Spark plugs should be changed first and set gap correctly. Only use the NGK copper core in pic.
    [​IMG]
    If it needs a new coil it should be replaced with a new Mopar which is always best if possible.
    If it's over 100,000 miles I'd replace all 6, I got away with the Standard # Uf 270, works good.

    Code P0157 check wiring first "downstream" bank 2 For the new 02sensor use only Mopar or NTK sensor only.
     
  4. 416kJ

    416kJ New Member

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    Thanks for the welcome :) &, thanks so much for you’re help !!so here’s what happened I actually did an engine wash a few days ago and thats when all symptoms started happening (ran smooth before) upon investigation I realized water got into the coil so I decided to take out all coils and plugs and blow them dry , I also changed the spark plugs at the same time and cleaned off all the ignition coils , problem solved :) yay
    I also used the zfr6f-11g plugs as recommended runs so much better they had the old factory plugs from before

    I will be having a look at the o2 sensor tomorrow, do you recommend ngk brand as a replacement sensor?

    oh and the 3rd code is just a repeat code of the P2302 code (cheapy scanner) :/

    all help appreciated :)
    Thanks LibertyTc (cheers)
     
  5. LibertyTC

    LibertyTC Well-Known Member Staff Member Moderator

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    It is so important in the forums that we have a clear description of the issues & what may have taken place right from the beginning.
    Anyways, I'm glad you have new correct spark plugs & the misfire solved.
    The Mopar o2 sensor would be best, or NGK/NTK sensor will work well in the KJ too.