Removal Procedure

CAUTION: The oxygen sensor uses a permanently attached pigtail and connector. Do not remove the pigtail from the oxygen sensor. Damage to or removal of the pigtail connector could affect proper operation of the oxygen sensor.

CAUTION: The use of excessive force may damage the threads in the exhaust manifold/pipe.

NOTE:

The in-line connector and louvered end must be kept clear of grease, dirt or other contaminants. Avoid using cleaning solvents of any type. DO NOT drop or roughly handle the heated oxygen sensor (HO2S).
The HO2S may be difficult to remove when the engine temperature is less than 48°C (120°F).

Fig 1: Identifying Engine Harness Electrical Connectors - Top Of Engine

Courtesy of GENERAL MOTORS CORP.

If equipped with regular production option (RPO) MN5, perform the following steps, remove the connector position assurance (CPA) retainer.
Disconnect the HO2S electrical connector lead from the engine harness electrical connector (4).

Fig 2: Identifying Engine Harness Electrical Connectors

Courtesy of GENERAL MOTORS CORP.

If equipped with RPO M86, perform the following steps, remove the CPA retainer (4).
Disconnect the HO2S connector lead from the engine harness electrical connector (5).

Fig 3: Identifying Wheel Drive Shaft Heat Shield

Courtesy of GENERAL MOTORS CORP.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
Bend the heat shield trough (2) down slightly until the HO2S lead (1) can be removed.

Fig 4: Identifying HO2S

Courtesy of GENERAL MOTORS CORP.

Using the J 39194-C , remove the HO2S.