Removal Procedure

CAUTION: Refer to Heated Oxygen and Oxygen Sensor Caution .

Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .

Fig 1: View Of Heated Oxygen Sensor Electrical Connector
Courtesy of GENERAL MOTORS COMPANY
Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensor (HO2S) electrical connector (2).
Remove the HO2S electrical connector retainer from the engine wiring harness clip (1).
Remove the HO2S (2) from the exhaust manifold.

Fig 2: Identifying Heated Oxygen Sensors & Exhaust Manifold
Courtesy of GENERAL MOTORS COMPANY