Tools Required
J 39194 Oxygen Sensor Wrench
Removal Procedure
Notice: 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.- Remove the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
- Disconnect the engine harness electrical connector from the HO2S pigtail.
- Remove the HO2S from the exhaust manifold using the J 39194 .
Important: Remove the HO2S with the engine temperature above 48°C (120°F). Otherwise the HO2S may be difficult to remove.
Installation Procedure
Important: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads, The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
- If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
- Install the HO2S (1) using the J 39194 .
- Connect the engine harness electrical connector to the HO2S pigtail.
- Install the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
Notice: Refer to Fastener Notice in the Preface section.
Tighten
Tighten the sensor to 42 N·m (31 lb ft).
