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Check Engine?

Old 02-16-2007, 05:38 PM
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Default Check Engine?

Code: P0420

I need help with Fixing... PM me or Post for some adivce/ Help!

Thanks
Old 02-16-2007, 06:14 PM
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https://ls1tech.com/forums/showthrea...ighlight=p0420
This might help...
Old 02-16-2007, 06:16 PM
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Usually a bad drivers side cat - did you get the GM letter extending the warranty? http://img518.imageshack.us/img518/4605/gmletterle2.jpg
Old 02-16-2007, 06:16 PM
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bad cats or bad rear O2 sensors.
Old 02-16-2007, 09:45 PM
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I had the same code just after I got my TA this summer. As stated above bad drivers side cat. Took it to the dealer and they replaced the cat at no charge. Then three weeks later I took it back off for LT's


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