So I got this today, just crusing around town and I do have test pipes installed but sure has nothing to do with this, anyone know which O2 sensor this is faulting? Which side and the one before or after the tipes?
I had this exact same code a couple months back and it went away on its own. I didn't have any issues with my car either it just popped up one day and about a week or two later it went away. I have a catback exhaust and test pipes too.
I’ve been told by a couple people and a local auto shop to use Catalytic Converter Cleaner from autozone or advance auto parts, worth a try? I’ve had this code for maybe 2-3 months now and when I clear it out it comes back after a couple days
look at the post cat O2 sensor voltage when driving. Once warmed up and cruising down the road at a steady speed, the voltage should be fairly steady and above .550 and below .750. It may go beyond those numbers when slowing down or speeding up.
if it is wandering around similar to the pre cat O2 then it's bad cat.