How many types of oxygen sensors are there?

[DeMaggie]

The types of oxygen sensors include: standard oxygen sensor, air-fuel ratio sensor, and nitrogen oxide sensor. The working principle of an oxygen sensor: it uses a ceramic sensing element to measure the oxygen potential in a heating furnace or exhaust pipe, calculates the corresponding oxygen concentration based on chemical equilibrium principles, thereby monitoring and controlling the air-fuel ratio of combustion in the furnace to ensure product quality and compliance with exhaust emission standards. Oxygen sensors are installed both before and after the three-way catalytic converter. The one installed before is called the front oxygen sensor, and the one installed after is called the rear oxygen sensor. The main function of the front oxygen sensor is to detect the oxygen content in the exhaust; the ECU can adjust the air-fuel ratio based on the data received from the front oxygen sensor. The main function of the rear oxygen sensor is to detect whether the three-way catalytic converter has failed.