by Brian » Mon Mar 28, 2016 8:20 am
Okay, so added the cat to the midpipe right? And you did O2 sensor install before and after that cat position? If so, and the sensors are in place before and after that cat then that should avoid code (assuming cat is healthy and extension of O2 wires is healthy too). Assuming all that, and assuming sensors in place before and after that cat, might be connection to sensor or might be issue with the sensor. Make sure wires to sensors are not pinch over at hard angles. Since it appears issue is sensor two, the tuner can turn that one off entirely, it is essentially just measuring function of that converter. You could even remove that second sensor entirely from the system and have the tuner just shut it off in the tune.