What are the functions of the front oxygen sensor and rear oxygen sensor?

[VanCameron]

The front oxygen sensor is mainly used to detect the oxygen content in the exhaust gas, while the rear oxygen sensor is primarily used to check whether the three-way catalytic converter is functioning properly. Below is an introduction to the front and rear oxygen sensors: 1. Installation position: The front oxygen sensor is generally located behind the exhaust pipe, and the rear oxygen sensor is usually positioned behind the three-way catalytic converter. 2. Function: The front oxygen sensor can detect the oxygen content in the exhaust gas and then send the signal to the ECU, which can adjust the engine's air-fuel ratio. The theoretically optimal air-fuel ratio is 14.7:1, and the ECU will maintain the air-fuel ratio near this theoretical optimum. The rear oxygen sensor also sends signals to the ECU, which compares the data from both sensors. If the data from both sensors is the same, it indicates that the three-way catalytic converter is faulty. The three-way catalytic converter can reduce pollutants in the exhaust gas, which is very important for environmental protection.