Removal Procedure

The heated oxygen sensor may be difficult to remove when engine temperature is below 48° C (120° F). Excessive force may damage threads in exhaust manifold or exhaust pipe.

Fig 1: Identifying HO2S Electrical Connector
Courtesy of GENERAL MOTORS CORP.
1. Disconnect the heated oxygen sensor (HO2S) electrical connector.
2. Use the J 39194-B  to remove the heated oxygen sensor (HO2S). See Special Tools .