This gets bumped off the S197 front page to fast so I am posting it here.

Ok, sorry if this is long winded, but I feel the need to explain in detail so someone can help the best they can.

Installed my dual exhaust, after the cats, did not mess with the cats or o2 sensors. About 1,000 miles after installation, my check engine light came on. I took it to the dealership, the error code was P0153, bank 1, sensor 1. The dealership replaced the o2 sensor and all was well. Till 300 miles later when my check engine light came on again. Had the codes read and got the same P0153 code, PLUS P0300 Engine(multiple cylinder) misfire. That scared the crap out of me. Took it to the dealership, they said the EGR Valve was stuck open, throwing the code. They ordered the parts and the next day I dropped it off, they replaced the EGR valve and the o2 sensor. They told me they ran a diagnostic and that fixed the problem.

Fast forward to TODAY, one day later, and less the 100 miles later, and my check engine light comes on AGAIN! Stopped by autozone on my way to work, had the code read, you guessed it, P0153.

At this point I am really frustrated, have lost all faith in the dealership, and ready to drive the car into a tree so the insurance can pay for it and I get another one. Ok, maybe that is to extreme.

Does anyone have ANY clue as to what the problem is? How to fix it? What my next step should be? Anything would help.

 

You could actually have a misfire and the o2 sensor is doing its job..

Honestly I cant help you from here but if I were in front of your car I might be able to help you