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Home >> Pontiac >> 2005 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.4L - Introduction >> Repair Instructions >> Heated Oxygen Sensor Replacement - Position 1 >> Removal Procedure
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Removal Procedure

NOTE: 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.
    Fig 1: Identifying HO2S Electrical Connector
    GM73896Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the electrical connector.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. NOTE: The use of excessive force may damage the threads in the exhaust manifold/pipe.
    IMPORTANT: If the engine temperature is not above 48°C (120°F), the oxygen sensor will be difficult to remove.
  4. Remove the heated oxygen sensor (HO2S).