Pulled code 0161 from my reader. "downstream heated O2 sensor heater circuit fault".
My question is: does this mean that the O2 sensor has failed or the circuit powering it has failed. The code is intermittant cuz I can reset it and it sometimes does not come back for a while and I see no affect with engine performance when the ses light is on.
Does anyone have prior experience with this code so I don't go changing something that doesn't need changing?
thanks, Chris