Looking to replace the 2 oxygen sensors due to trying to fix P0171 code but I have found 3 different part number on AC Delco's website. I know there are 2 but some websites say position 1 & 2. I can't seem to tell the difference. What have you used?
Ac Delco #'s 213-3207 heated O2 sensor.
213-3542 OE service O2 sensor
213-4348 Profesional heated O2 sensor Position 1
Yes, I have done all of the easy fixes and cleaning so far, just figured that after 113,000 it is time to replace the sensors since they may add to the code.