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Discussion in 'Technical Chat' started by jprichard, May 9, 2009.

  1. May 9, 2009 at 2:44 PM

    jprichard [OP] New Member

    Oct 24, 2007
    02 prerunner
    revtek lift flowmaster exhaust,k&n fipk, throttle bodie spacer
    I need some advice on code P0420.(Catalyst system efficiency before rear H02S). I have changed the rear CAT, checked for exhaust leaks before the rear 02sensor, ran some injector cleaner. Any ideas? Possible rear 02sensor? I have 115,000 miles. The code appears instantly after I clear it.

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