To replace Heated Oxygen Sensor (HO2S), Bank 2 Sensor 1, first, lift vehicle. Now, unplug the connector for the HO2S, and then unplug the HO2S using the Oxygen Sensor Wrench (J 39194-B). Prior to installation if needed, paint the threads of a new or service replacement sensor with anti-seize compound GM P/N 5613695, which is a liquid graphite and glass beads mixture to make extraction easier at a later time. Replace the HO2S by using the Oxygen Sensor Wrench (J 39194-B), and screw in the HO2S with 42 N.m (31 lb ft). Finally, position the HO2S harness connector and also drop down the vehicle.