Codes
#3
Copy & Paste Moderator
Its either a bad 02 sensor or a plugged up cat.
Its in the sticky:
https://ls1tech.com/forums/showthrea...ighlight=P0420
Its in the sticky:
https://ls1tech.com/forums/showthrea...ighlight=P0420
#5
Staging Lane
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Join Date: Sep 2005
Location: Bay Area
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Its a bad cat on the drivers side.. I just had my replaced for free under the extended warrenty for 120,000 or 10 years from purchase date... the letter should of came in the mail to your address if not call ur local chevorlet dealership and talked to them as it should be replaced for free.