Removal Procedure

Fig 1: View Of O2 Sensor Harness Routing

Courtesy of GENERAL MOTORS CORP.

Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
If necessary, unbolt the front propeller shaft from the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
Disconnect the connector position assurance (CPA) retainer.
NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices.
Remove the heated oxygen sensor (HO2S) electrical connector from the fuel line clip.
If equipped with a 4.8L or 5.3L engine, disconnect the HO2S electrical connector (1).

Fig 2: View Of Transmission & HO2S Sensor Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Fig 3: View Of Oxygen Sensors

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Cautions and Notices.