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Thread: Help

  1. #1

    Help

    1997 buick skylark check engine light, code is po420 can anybody help me?

  2. #2
    Join Date
    Aug 2005
    Posts
    700
    Rep Power
    0
    Code P0420 is for a" Catalyst System Efficiency below threshold" ( bank 1 ) most commomn is from a clogged Cat. Converter , but you can have the exhaust sys. tested for excessive back pressure and if it's too high you would need to replace the Cat. Converter assy.
    H.T.H.
    John
    Guyopel
    The early bird gets the worm but the second mouse always gets the cheese.

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