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Po420 code

Discussion in '1st Gen. Tacomas' started by jprichard, May 9, 2009.

  1. May 9, 2009 at 1:18 PM
    #1
    jprichard

    jprichard [OP] New Member

    Joined:
    Oct 24, 2007
    Member:
    #3207
    Messages:
    2
    Vehicle:
    02 prerunner
    revtek lift flowmaster exhaust,k&n fipk, throttle bodie spacer
    Hey guys, got the 420 code (Catalysr efficiency below threshod bank 1.
    I replaced rear Cat, checked for leaks before rear o2 sensor, ran injector cleaner. Cleared the code but still comes back. Any ideas? Rear o2 sensor? Thanks.
     
  2. May 25, 2009 at 3:32 PM
    #2
    00tacond

    00tacond Member

    Joined:
    Mar 7, 2009
    Member:
    #14429
    Messages:
    22
    Gender:
    Male
    Michigan
    Vehicle:
    00 pre-runner v6
    Donahoe front coils, deaver leafs
    I would say the front O2. If both O2's are switching from rich to lean it is because the rear O2 is trying to correct the front O2. Replace the front O2.
     
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