Thread: truck driver

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  1. #1 truck driver 
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    hi! everyone,
    I'v got a code PO420 on a 2004 Grand Prix and trying to figure it out. thanks!
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  2. #2 Re: truck driver 
    GTX Level Member a98gtp4u's Avatar
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    i think po420 is catalyst efficiency below threshold. mite need an 02 sensor or bad cat on it.
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  3. #3 Re: truck driver 
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    Thanks for the info!
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  4. #4 Re: truck driver 
    GTX Level Member a98gtp4u's Avatar
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    No prob.
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