The Function and Faults of Oxygen Sensor

[JosiahRose]

The function of the oxygen sensor is: 1. To measure whether there is excess oxygen in the exhaust after engine combustion, converting the oxygen content into a voltage signal and transmitting it to the engine computer, enabling the engine to achieve closed-loop control with the excess air factor as the target, thereby improving the fuel combustion quality of the automobile engine. 2. To ensure that the three-way catalytic converter has conversion efficiency for the three pollutants in the exhaust—hydrocarbons, carbon monoxide, and nitrogen oxides—facilitating the conversion and purification of emission pollutants. The faults of the oxygen sensor include: 1. Sensor poisoning and carbon buildup. 2. Ceramic breakage of the oxygen sensor, burnout of the heater resistance wire, and internal wiring disconnection of the oxygen sensor.