I had turned it off in tune ecu no codes when turned off there, i didnt want it making corrections to my tune and now its not in system, that bung is only used for data collection now, no o2 sensor . no second butterflies no stepper(suh dont tell) no second shaft, throttle bodies bored. Idles perfect runs perfect, I actually used my o2 sensor to make a venturi crank case breather.