Where is the oxygen sensor in the car? Location map of the car oxygen sensor

The car oxygen sensor is the key feedback sensor in the electronic fuel injection engine control system, which is used to control the emission of car exhaust. But when it comes to where it is, many friends said that they were not very clear. So, what is the position of the oxygen sensor in the car, so that everyone can observe it more intuitively, let's give a map of the position of the car oxygen sensor below.

Location map of car oxygen sensor

There are actually two types of oxygen sensors, front and rear, both of which are installed in the exhaust pipe of the engine.Take threeYuanCatalysis is the boundary. Before the three-way catalysis is the front oxygen sensor, and the one after the three-way catalysis is the rear oxygen sensor.

1. The function of the front oxygen sensor is to detect the oxygen concentration in the exhaust gas of the engine, and then transmit the obtained information to the ECU in the form of electrical signals, and the ECU will feedback control the air-fuel ratio based on the obtained oxygen concentration information .

2. As for the rear oxygen sensor, it is mainly used to detect the oxygen concentration of exhaust gas after three-way catalytic purification. If the oxygen concentration data obtained by the front oxygen sensor and the rear oxygen sensor are the same, then the three-way catalyst has failed.

Don't underestimate the existence of the car's oxygen sensor. Once a malfunction occurs, the computer of the electronic fuel injection system cannot obtain accurate information about the oxygen concentration in the exhaust pipe, and thus cannot perform feedback control on the air-fuel ratio. As a result, the fuel consumption of the engine will increase, and the exhaust emissions will also increase. Over time, it is prone to malfunctions such as unstable engine idling, misfire, and surge. Therefore, when the oxygen sensor fails, it must be repaired or replaced in time.