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Thread: o2 data OK? or off cus exhaust leak tiny?2010 impala 3.5

  1. #1
    Potential Tuner
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    o2 data OK? or off cus exhaust leak tiny?2010 impala 3.5

    hey if anyone like to help that be awesome ill post a log from after I got the leak from new flex flange barley heard. just tiny buzz when realy on it. any way the car is a cali emissons car it had the 2 cat down pipe I replaced it with just 1 cat fedral pipe cus im in R.I but flnge had small leak at new flangeat the manifold and I keptgetting p0420 cateff low came back fast evry clear. then I squezzed it lil more and almost all gone leak but p0420 came back but was after few days driving not same day like before...So idk if I cali tune is stricter or what my options are just want log some good data so I can start messing around with it alil now that got HP! just want make sure she running right before aplay obvy. so any help /info would be great obvy new here lol but not to stupid lmao


    i put my stock tune read also from 2010 impala lt 3.5L non-flex vin N with California emissions if any that matters.

    the log was 20 min ride home but rightafter i had to clear the 420 dct that came on on that ride to there for first time in days fyi

    thanks all.... matt
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  2. #2
    Tuner in Training
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    Sep 2016
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    Any leak before or near the O2s is never good to have so fix that. 420 code is cat inefficiently which maybe coming from the fact you now have 1 cat vs 2. Fix the leak and turn off the 420 code.

  3. #3
    Advanced Tuner ZeroBoostBuick's Avatar
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    If P0420 is the ONLY code coming up, that can be due to the leak, or a bad cat, or both.

    Unfortunately without fixing the leak you won't be able to determine the reason for the code.

  4. #4
    Potential Tuner
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    yea that's what I assumed ...thanks guys. hate not having lift anymore!lol