Removal Procedure
- Ignition OFF.
- Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
- When major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.
- When performing work in the engine compartment or under the vehicle, ensure that the hood is fully open, or opened to its secondary latch. When the hood is opened to the secondary latch, the vehicle will disable the remote start features from the key fob and OnStar mobile app. Failure to open the hood, or open the hood to the secondary latch while doing a repair in the engine compartment or under the vehicle can result in inadvertent vehicle starting which could result in personal injury or damage to a vehicle.
- Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
- Disconnect the heated oxygen sensor (HO2S) electrical connector.
- Disconnect the heated oxygen sensor (HO2S) harness retainer (2).
- Remove the HO2S (1).
Refer to Exhaust Service Warning .
Refer to Protective Goggles and Glove Warning .
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.
Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
Refer to Battery Disconnect Warning .
To avoid any vehicle damage, serious personal injury or death:
Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.
If the harness retainer is damaged during removal, it must be replaced.