Have a 2011 CTT. Just moved to a new area and filled gas at a new gas station. Within seconds of driving away, I got a check engine light. Went to the local dealer and ran codes, said oxygen sensor bank 1. They are ordering parts to be installed.

I recently had fabspeed cat-bypass pipes installed, could that be the problem? I've been reading that there may be a discrepancy between pre and post cat oxygen sensors, so I wonder if the pipes are the problem (even though I've had them on the car for a few months already).

Could it be bad gas? Symptoms include mild hesitation when starting and idling. And smells like raw gas from the exhaust. I just bought a durametric so I can check and clear codes in the future.

John