Quote Originally Posted by Scimmia View Post
Are you running a stock cat? If not, many aftermarket cats throw this code all of the time, they just don't work as well as OEM.

If you are stock, hopefully you're under 120,000 mi, because GM extended the warranty on the cat on the 01-02 L36 because of a defect that could block it. Take it to the dealership for a free fix.


Awesome info about the recal. Did not know that myself. And good paint about the high flow cat's.