Question about 2004 GMC Sierra

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I have a 2004 gmc sierra and it has a trouble of p0420.What does this mean?

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Please go to the web link below for information on this code

http://www.obd-codes.com/p0420

Posted on Oct 02, 2010

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My 2004 gmc sierra detected a PO200 and PO300 code..what does that mean and how can i handle the problem?


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Trouble shooting


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