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Home >> Buick >> 2005 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Introduction >> Repair Instructions >> Heated Oxygen Sensor Replacement - Position 1 >> Installation Procedure
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Installation Procedure

    Fig 1: Installing Rear Oxygen Sensor In Rear Exhaust Manifold
    GM12348Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound P/N 5613695 or equivalent.
  1. Install the rear oxygen sensor (1) in the rear exhaust manifold.

    Tighten:  Tighten the rear HO2S to 41 N.m (30 lb ft).

    2. Fig 2: Connecting HO2S Sensor Electrical Connector (3.8L)
    GM371512Courtesy of GENERAL MOTORS CORP.
  2. Lower the vehicle.
  3. Connect the electrical connector (3) to the HO2S.
  4. Connect the HO2S electrical connector tab to the bracket.
  5. Install the HO2S electrical connector retainer.
  6. Install the fuel injection sight shield. Refer to Fuel Injector Sight Shield Replacement (L36) in Engine Mechanical.
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