Removal (3.8L)
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2002 Buick Regal, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Turn OFF the ignition. HO2S 1 is located in exhaust manifold. See Figure. HO2S 2 is located behind catalytic converter. See Figure. Remove fuel injector sight shield (upper engine cover) from engine. If removing HO2S 2, raise and support vehicle. On all sensors, disconnect the HO2S harness connector. Using Heated Oxygen Sensor Wrench (J-39194-B), remove the HO2S.