July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Removal Procedure

IMPORTANT: The heated oxygen sensor (HO2S) 1 may be difficult to remove when engine temperature is less than 48°C (120°F). Excessive force may damage the threads in the exhaust manifold.

Disconnect the heated oxygen sensor (HO2S) 1 electrical connector.
Use the J 39194-B to remove the HO2S 1. See Special Tools and Equipment .

Fig 1: Removing HO2S

Courtesy of GENERAL MOTORS CORP.