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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1097 (Engine Controls - 3.6L (Ly7) (Introduction)) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Position 1 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.
Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Disconnect the intermediate steering shaft from the steering gear. Refer to Intermediate Steering Shaft Replacement in Steering Wheel and Column.
  3. Remove and reposition the front portion of the front fender liners in order to gain access to the frame front bolts. Refer to Front Fender Liner Replacement in Body Front End.
  4. Lower the vehicle.
    5. Fig 1: Supporting Powertrain With A Floor Jack
    GM628909Courtesy of GENERAL MOTORS CORP.
  5. Position a floor jack at the front center section of the frame in order to support the powertrain.
  6. Remove the frame front bolts.
  7. Carefully lower the powertrain or raise the vehicle in order to gain access to the oxygen sensor.
  8. Disconnect the oxygen sensor electrical connector.
    9. Fig 2: View Of Heated Oxygen Sensor (HO2S)
    GM1394064Courtesy of GENERAL MOTORS CORP.
    NOTE: The use of excessive force may damage the threads in the exhaust manifold/pipe.
    IMPORTANT: If the engine temperature is not above 48°C (120°F), the oxygen sensor may be difficult to remove.
  9. Remove the heated oxygen sensor (HO2S).
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