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Thread: P0420

  1. #1
    Potential Tuner
    Join Date
    Apr 2011
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    4

    Exclamation P0420

    I have this code throwing since I installed a SOLO cat and Trifecta Tune on my 2009 Solstice 2.0 turbo .
    I have heard that adding an O2 extender will help but believe that there is more to it than that .
    I have their reflash software and can turn it off but then will not pass inspection due to 2 not ready's .
    The other not ready is the EVAP system and am tired of trying to get it to the ready .
    Any help or insight would be appreciated .

  2. #2
    Advanced Tuner
    Join Date
    Sep 2006
    Location
    Phoenix, AZ
    Posts
    565
    Unfortunately that CAT flows too well, and appears like a faulty cat or no cat to the ECM. You will need to put in an O2 extender.

    EVAP issues on the Kappa cars are a pain in the butt. Make sure your Evap codes are not disabled.

  3. #3
    Potential Tuner
    Join Date
    Apr 2011
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    4
    Quote Originally Posted by PSYKOSTEVO View Post
    Unfortunately that CAT flows too well, and appears like a faulty cat or no cat to the ECM. You will need to put in an O2 extender.

    EVAP issues on the Kappa cars are a pain in the butt. Make sure your Evap codes are not disabled.
    Thank You for the input
    I have flashed back to stock and am waiting on the extender
    As far as the EVAP system goes I have given up .

  4. #4
    Potential Tuner
    Join Date
    Apr 2011
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    4

    success

    Quote Originally Posted by dh007 View Post
    Thank You for the input
    I have flashed back to stock and am waiting on the extender
    As far as the EVAP system goes I have given up .
    Update
    Ran 5 drive cycles and emission monitor ok no codes pending
    So the extender did the trick
    EVAP system still Inc

    Will pass no prob inspection

    Bought. HP pro delivered today for new turbo this year
    Now time to study

  5. #5
    Tuner in Training
    Join Date
    Nov 2010
    Posts
    27
    Why can't I disable this code on an 08 Solstice GXP Turbo? I select "disable" on the P0420 in the Engine Diag tab because it still throws a code with the high flow cat, but it still throws the code. Really frustrating.