Heated O2 Sensor Replacement - Bank 1 Sensor 1
Notice: 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.
5. Remove the HO2S (1). Use the J 39194-B , if necessary.
Installation Procedure
Important : A special anti-seize compound is used on the HO2S 1 threads. The compound consists of graphite suspended in fluid and
glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will
already have the compound applied to the threads. If a sensor is removed from an engine and is to be reinstalled, the threads must have
anti-seize compound applied before the reinstallation.
1. Coat the threads of the HO2S with anti-seize compound GM P/N 12377953 or equivalent, if necessary.
Notice: Refer to Fastener Notice (See: Service Precautions/Vehicle Damage Warnings/Fastener Notice) .
2. Install the HO2S (1). Use the J 39194-B , if necessary.
