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Old 08-11-2018, 12:52 PM   #8
gmw0181
 
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Drives: 2017 Camaro 2SS A8
Join Date: Dec 2017
Location: Ohio
Posts: 137
PO420 Code

Quote:
Originally Posted by bullet3z View Post
So you still have the factory cats? If so then it sounds like you might have an exhaust leak. I took out my secondary cats and my check engine like does not come on.
Yep you were correct. I went back to the installer a third time and they removed the exhaust and corrected a leak by the driver side cat. The leak was only when it was cold and very little when hot. Once I showed them the leak on a cold start they came in during off business hours to fix it.
Thanks for the info it helped me a lot. No more CEL.
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