Thread: pP0420 engine code

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  1. #1 pP0420 engine code 
    Golman76
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    Default 02-07-2010
    i got the P0420 engine code. it says catalyst efficiency below threshold. what does this mean?
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  2. #2 Re: pP0420 engine code 
    TheOtherNick
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    Default 02-07-2010
    Could be a bad cat or bad sensor.
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