RG85734

Had same issue. The codes that popped up were P0141, P0135, P0155. I replaced all sensors, as it seemed the logical thing to do while the check engine light was on and the car ran great otherwise. After sensors were replaced, the light still came on. This was frustrating, and I just had the local shop run it on the scope and figure out there were other wires and ground wires that needed replacing that directly had an impact on the sensors. Light has not been on so far, car passed emissions with no CEL. I would say after replacing the sensors and the same codes come on, even after pulling the negative cable from the battery, it is a deeper issue than the O2 sensor(s). It can be the harness to the sensors, wiring, grounds (like in my case) or even the ECM or its harness. I will drive for a while to see if the CEL pops back up, but I honestly doubt it will. Have fun, all...