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2001 Cadillac DeVille DTS Question: had an emission test done and failed with a P0420 error code. help plez

 

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stan mayer, Meridian, ID, June 05, 2013, 16:40
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I am fairly knowledgeable about automobiles. anyway,
wondering how you would stack up the most likely causes of this error code that I think comes and goes and seems to occur when I put the pedal to the metal. The error is easily resettable by me and stays away for weeks or until I punch my caddy.

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