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Home >> Buick >> 2008 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - Introduction (2 Of 2) >> Repair Instructions >> Heated Oxygen Sensor 2 Replacement >> Removal Procedure

Removal Procedure

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.
    Fig 1: View Of Heated Oxygen Sensor (Position 2)
    GM911099Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the heated oxygen sensor (HO2S) electrical connector retaining clip from the HO2S electrical harness connector.
  3. Disconnect the HO2S electrical connector from the HO2S electrical harness connector.
    4. IMPORTANT: Remove the oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
  4. Use the J 39194  to remove the O2S from the exhaust pipe. See Special Tools .
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