July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Removal Procedure

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

GM898333

Courtesy of GENERAL MOTORS CORP.

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