Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices.

NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Cautions and Notices.

Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter.
Remove the catalytic converter. Refer to Catalytic Converter Replacement (4.2L Engine) or Catalytic Converter Replacement (5.3L Engine) in Engine Exhaust.
Remove the connector position assurance (CPA) retainer.

Fig 1: Locating Components Connectors At Rear Of Engine

Courtesy of GENERAL MOTORS CORP.

Disconnect the heated oxygen sensor (HO2S) electrical connector (3).