Oxygen Sensor: Description and Operation

Fig.19 - Oxygen Sensor Sectional View:

The oxygen sensor monitors the composition of the exhaust gases leaving the engine.

Signals from the oxygen sensor are transmitted into a closed loop feedback system which continuously adjusts the air/fuel ratio to reduce emission of hydrocarbon (HC), carbon monoxide (CO) and nitrous gases (NOx).

The oxygen sensor must be replaced every 30,000 miles.