Impala V6-3.8L VIN K (2004)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor (HO2S) 2 Replacement
HEATED OXYGEN SENSOR (HO2S) 2 REPLACEMENT
TOOLS REQUIRED
J 39194 Oxygen Sensor Wrench
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.
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. Raise and support the vehicle. Refer to Vehicle Lifting.
2. Remove the HO2S electrical connector retaining tab (1) from the HO2S electrical connector (2).
3. Disconnect the HO2S electrical connector from the HO2S electrical connector (2).
4. Use the J 39194 to remove the HO2S from the exhaust pipe.
Installation Procedure
NOTE: Refer to Fastener Notice in Service Precautions.
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 12377953 or equivalent.