Engine Performance problem
1999 Pontiac Grand Prix 6 cyl Front Wheel Drive Automatic 144256 miles
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.
have the same problem?
Sunday, July 19th, 2009 AT 6:57 PM