Express 1/2 Ton Van V8-305 5.0L VIN M SFI (1998)
CAUTION: The Heated Oxygen Sensor (HO2S) may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may
damage the threads in the exhaust manifold or the exhaust pipe.
REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
2. Remove the electrical connector by releasing the locking tab.
3. Carefully back out the heated oxygen sensor.
INSTALLATION PROCEDURE
NOTE: A special anti-seize compound is used on the Heated Oxygen Sensor (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 engine and if for any reason it is to be reinstalled, the threads must have
anti-seize compound applied before the reinstallation.
1. Coat the threads of the oxygen sensor with anti-seize compound GM P/N 5613695 or the equivalent if necessary.
2. Install the sensor.
Tighten
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Tighten the sensor to 41 Nm (30 lb. ft.).
3. Install the electrical connector.
4. Connect the negative battery cable.
