GMC 12622308 Sensor Assembly, Heated Oxygen (Pre, Cataly

You can Select Your Vehicle to check if 12622308 fits your vehicle.

All models covered by this manual have four heated oxygen sensors: one upstream sensor per cylinder bank and one downstream sensor per cylinder bank. The sensors are heated to speed up the warm-up time during which the sensors are unable to produce an accurate voltage signal.

Special care must be taken whenever a sensor is serviced, as they are extremely delicate and cannot be dropped or handled roughly. To remove the upstream or downstream oxygen sensor, the vehicle must be raised and securely placed on jackstands. The sensor electrical lead must be traced to the connector and disconnected before unscrewing the sensor with an oxygen sensor socket. If the sensor is difficult to loosen, penetrating oil can be sprayed onto the sensor threads and allowed to soak in for a while.