Recently my passenger side cat took a dump and broke internally making a horrible sound. Took it to the local Pontiac dealership, fixed it at no cost (thank god) and informed me that my car's covered for 120,000 miles through GM. Anyways... i'd had a SES light for a long time and just figured it to be that O2 or the cat since that's what autozone's scan told me. But after the cat replacement the codes gone, problem solved.
So my real question is would that code have effected my performance that much? I guess with my cat broken the exhaust wouldn't flow very well through that side... but am i going to notice that much of a difference?
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It would most likely effect the performance for that side of the motor the cat went bad on. I know if it was the pre-cat O2, I know it will pull timing, but not 100% sure if it will do it for a rear O2.
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