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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 8.1L (Introduction) >> Repair Instructions >> Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 >> Removal Procedure
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Removal Procedure

NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices.
    Fig 1: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Disconnect the connector position assurance (CPA) retainer.
  3. Disconnect the heated oxygen sensor (HO2S) sensor electrical connector (1).
  4. Fig 2: Locating Heated O2 Sensor (Sensor 1)
    GM710383Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Cautions and Notices.
  5. Remove the HO2S (1).