Oxygen Sensors: Removal
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Raise and support vehicle. Disconnect harness connector from appropriate HO2S. Carefully remove HO2S from exhaust pipe using Oxygen Sensor Tool (J-39194-B).