Removal (8.1L)
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Raise and support the vehicle. Disconnect the appropriate Connector Position Assurance (CPA) retainer. Disconnect the heated oxygen sensor (HO2S) electrical connector. Remove the HO2S.