Eclipse L4-1997cc 2.0L DOHC (1991)
Oxygen Sensor: Description and Operation
Heated Oxygen 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.
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.