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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Engine Control System & Fuel System - 3.8L - Introduction (2 Of 2)) >> Repair Instructions >> Heated Oxygen Sensor 1 Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of HO2S Electrical Connector & Right Exhaust Manifold
    GM911055Courtesy of GENERAL MOTORS CORP.
    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 .
  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. 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 the J 39194  to remove the HO2S (2) from the right exhaust manifold. See Special Tools .
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