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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 973 (Engine Controls - 4.8L, 5.3L, & 6.0L (Introduction)) >> Repair Instructions >> Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. If necessary, unbolt the front propeller shaft from the front differential. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
  3. Disconnect the connector position assurance (CPA) retainer.
    NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices.
  4. Remove the heated oxygen sensor (HO2S) electrical connector from the fuel line clip.
    5. Fig 1: View Of O2 Sensor Harness Routing
    GM664951Courtesy of GENERAL MOTORS CORP.
  5. If equipped with a 4.8L or 5.3L engine, disconnect the HO2S electrical connector (1).
  6. If equipped with a 6.0L engine, disconnect the HO2S electrical connector (1).
    7. Fig 2: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  7. Remove the HO2S.
    8. Fig 3: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
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