2003 GMC Sierra Repair Question
Topics covered: Sensor.
Mileage: 240,000 miles.
Mileage: 240,000 miles.
Asked on June 21, 2012
If bank 1 too lean and drivers side plugs not firing, can i change both o2 sensors on driversside to fix issue??
03 gmc sierra 5.3, showing codes po171 bank 1 too lean, and po300 random/multiple misfire , pulled plugs and drivers side plugs are black like theyre not firing, passengerside plugs were tan. if drivers side is not firing due to o2 sensor can i change both o2 on driverside to fix issue
Asked by richard1983Answer
Replied on June 21, 2012
If the plugs are not firing, the O2 sensor would not help. You need to find out what is causing the non firing. It could be something else that is wrong.
