1999 Pontiac Grand Prix trouble code p0420

1999 PONTIAC GRAND PRIX
144,256 MILES • 6 CYL • FWD • AUTOMATIC
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NKANE
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Hi. Well my question is the code p0420, what would cause this code to show up. I have went through and checked for vaccum leaks and everything else I could think of. Please send me any information that you can think of that might help me figure this out. Thanks very much nathan kane
i do apologize its got a 3.8 v6 sorry about that.
Jul 19, 2009 at 6:57 PM
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BUDDYCRAIGG
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need to know what V6 engine you have.

the primary cause is a problem with the converter, but there are other things to look at too.
Jul 19, 2009 at 8:10 PM
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NKANE
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[quote:d05ffca9d8="buddycraigg"]need to know what V6 engine you have.

the primary cause is a problem with the converter, but there are other things to look at too.[/quote:d05ffca9d8]

its a 3.8 v6.
Jul 19, 2009 at 8:37 PM
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BUDDYCRAIGG
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I have sent you a word document to your email account.
Jul 19, 2009 at 9:30 PM