2008 Chevrolet Impala Oxygen Sensor

You should handle the oxygen sensor carefully and take care not to drop the oxygen sensor and keep the in-line connector and the louvered end free of grease, dirt, or other contaminants.

Aspecial 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 an anti-seize compound applied before reinstallation.

The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). So you should take care that excessive force may damage threads in the exhaust manifold or the exhaust pipe.

You mustn't use cleaning solvents on the sensor, or drop or mishandle the sensor.

The recommended torque is 42 N.m (31 lb-ft).