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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.6L - Repair Instructions >> Repair Instructions >> Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 >> Removal Procedure
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Removal Procedure

    CAUTION:

    The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.

    Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.

    NOTE:

    Bank 1 is the right bank.

    Fig 1: View Of HO2S Electrical Connector -- Bank 1, Sensor 1
    GM887894Courtesy of GENERAL MOTORS COMPANY
  1. Turn the ignition OFF.
  2. Remove the fuel injector sight shield, if necessary. Refer to Fuel Injector Sight Shield Replacement (LLT) .
  3. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  4. Remove the HO2S electrical connector from the wiring harness bracket.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    6. Fig 2: View Of HO2S - Bank 1, Sensor 1
    GM887896Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Oxygen Sensor Caution .

    NOTE:

    Removal of the oxygen sensor is easier when the engine temperature is above 48°C (120°F).

  6. Remove the HO2S from the catalytic converter.
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