Galant AWD L4-1997cc 2.0L DOHC Turbo (1991)
Oxygen Sensor: Description and Operation
Oxygen (O2) Sensor Circuit
The oxygen (O2) sensor, located in the exhaust manifold is used to provide more precise control of air/fuel mixtures. This system operates by
measuring oxygen content in exhaust gases, as the amount of oxygen remaining in the exhaust gases is directly proportional to the air/fuel ratio of
mixtures entering the engine. This senor uses an internal heater. This allows the sensor to reach operating temperature faster than if it had to rely
on exhaust gas only.
The oxygen sensor is made of a ceramic material called zirconium dioxide. The inner and outer surfaces of the ceramic material are coated with a
very thin layer of platinum. The outer surface is exposed to the exhaust gasses, while the inner surface is exposed to the outside air.
