Where are the oxygen sensors located in a car?

[AdalineRose]

Oxygen sensors are actually divided into two types, front and rear, both installed at the position of the engine exhaust pipe. Taking the three-way catalytic converter as the boundary, the one before the three-way catalytic converter is the front oxygen sensor, and the one after is the rear oxygen sensor. The functions of the oxygen sensors are as follows: 1. The front oxygen sensor is used to detect the oxygen concentration in the engine exhaust gas, and then transmits the obtained information to the ECU in the form of an electrical signal. The ECU will use the oxygen concentration information to perform feedback control on the air-fuel ratio. 2. As for the rear oxygen sensor, it is mainly used to detect the oxygen concentration in the exhaust gas after purification by the three-way catalytic converter. If the oxygen concentration data obtained by the front and rear oxygen sensors are the same, it indicates that the three-way catalytic converter has failed.