2008 GMC Yukon Oxygen Sensor

You can coat the threads with anti-seize compound GM P/N 12377953, or equivalent if you reinstall the old sensor, install the HO2S, connect the HO2S electrical connector to the engine wiring harness electrical connector, install the CPA retainer, install the front propeller shaft to the front differential, if equipped with 4WD, and lower the vehicle.

You can slide the lever lock forward while pressing down on the lever lock release tab, disconnect the connector, locate the dress cover locking tabs at the corners of the dress cover, use a small flat-blade tool to release the locking tabs, and remove the dress cover, use a small flat-blade tool to slide the terminal position assurance (TPA) up one notch on both ends of the connector, pull the wire out of the back of the connector while holding the removal tool in place.

You should handle the oxygen sensors carefully to prevent damage to the component, keep the electrical connector and the exhaust inlet end free of contaminants, and avoid using cleaning solvents on the sensor and dropping or mishandling the sensor.

The heated oxygen sensors each use a permanently attached pigtail and connector. you should not remove the pigtail from the heated oxygen sensor. you should handle the oxygen sensor carefully. you should not drop the oxygen sensor. you should replace the oxygen sensor if the pigtail wiring, the terminals, or the connector is damaged.

The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.