Oxygen Sensor: Service Precautions

Do not use sealants containing silicone to seal the intake area on engines with oxygen sensors. Silicone particles are not consumed during combustion, consequently the unburned particles travel via the exhaust stream to the oxygen sensor where they can eventually coat the sensor probe and interrupt or destroy proper oxygen sensor function. Do not use electrical contact cleaner (or equivalent) in the area of the heated oxygen sensor harness connector because it can lead to corrosion damage of the oxygen sensor.