Removal Procedure

Fig 1: Heated Oxygen Sensor (Position 2)

Courtesy of GENERAL MOTORS CORP.

CAUTION: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.
Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.

CAUTION: 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.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
Remove the heated oxygen sensor (HO2S) electrical connector retaining clip from the HO2S electrical harness connector.
Disconnect the HO2S electrical connector from the HO2S electrical harness connector.

NOTE: Remove the oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.

Use the J 39194 to remove the O2S from the exhaust pipe. See Special Tools .