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Home >> Chevrolet >> 2004 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System 3.8L (Introduction) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Position 1 >> 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.
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical 3.8L.
  2. Remove the heated oxygen sensor (HO2S) electrical CPA retainer.
  3. Disconnect the HO2S wiring harness connector (3) from the HO2S electrical connector (4).
  4. Remove the HO2S electrical connector (4) from the fuel injector sight shield bracket (1).
    5. IMPORTANT: Remove the oxygen sensor 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). See Special Tools and Equipment .
    6. Fig 1: Removing HO2S (Position 1)
    GM371512Courtesy of GENERAL MOTORS CORP.
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