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Thread: Check Engine Light - P0420

  1. #1
    Events Manager minuteman048's Avatar
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    Check Engine Light - P0420

    On the way home from a great meet the other night I got a CEL....SOB!! Kind of knew what it was so was not too alarmed. Since I have the high flow cat mid-pipe you can get a P0420 code which is the rear oxygen sensor. Since the flow through the cat is much higher, sometimes the sensor does not pick up anything. So that's when you need one of these:

    http://www.bigdaddiesgarage.com/

    http://www.bigdaddiesgarage.com/straight-cel-fix.html

    The current one is the second one I have gone through and they last a few years so it's time to replace it. Got one on order.
    99 Emerald Mica, 01 Header, Ground Control Springs w/Bilstein HDs. Thompson CAI, High Flow cat w/Borla Exhaust, Fab9 COP's
    Good Judgement Comes From Experience
    Experience Comes From Bad Judgement

  2. #2
    Events Manager minuteman048's Avatar
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    Re: Check Engine Light

    testing
    99 Emerald Mica, 01 Header, Ground Control Springs w/Bilstein HDs. Thompson CAI, High Flow cat w/Borla Exhaust, Fab9 COP's
    Good Judgement Comes From Experience
    Experience Comes From Bad Judgement

  3. #3
    ⚙ Gearhead 1K+
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    Re: Check Engine Light

    nice way to defeat the ecm when gutting the cat.....

  4. #4
    Deep state actor ☚☻☛ Agent☣Orange's Avatar
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    Re: Check Engine Light - P0420

    Too bad the rear O2 can’t be disabled in a tune.

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