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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Engine Controls (Introduction) - 3.8L) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Position 1 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: The oxygen sensor may be difficult to remove when the engine temperature is below 48° C (120° F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (L26) or Fuel Injector Sight Shield Replacement (L32) in Engine Mechanical - 3.8L.
  2. Remove the heated oxygen sensor (HO2S) retaining clip.
  3. Disconnect the HO2S electrical connector (1).
  4. Remove the HO2S electrical connector (1) from the fuel injector sight shield bracket.
    5. Fig 1: Heated Oxygen Sensor (Position 1)
    GM911055Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Remove the oxygen sensors with the engine temperature above 48° C (120° F). Otherwise the oxygen sensors may be difficult to remove.
  5. Use theJ 39194  to remove the HO2S (2) from the right exhaust manifold. See Special Tools and Equipment .
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