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.

CAUTION: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution .

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).

NOTE: The HO2S may be difficult to remove when the engine temperature is less than 48°C (120°F).

Fig 1: CPA Retainer, ECT & HO2S Electrical Connectors

Courtesy of GENERAL MOTORS CORP.

Remove the connector position assurance (CPA) retainer (3).
Disconnect the HO2S electrical connector (2).

Fig 2: HO2S Electrical Connector Clip

Courtesy of GENERAL MOTORS CORP.

Remove the HO2S electrical connector clip from the thermostat housing.

Fig 3: HO2S Sensor 1

Courtesy of GENERAL MOTORS CORP.

Remove the HO2S.