What is the function of the front oxygen sensor?

[McDante]

The function of the front oxygen sensor is to detect the oxygen content in the exhaust gas produced after the combustion of the cylinder's air-fuel mixture. Below is a detailed introduction to the consequences of a faulty front oxygen sensor: 1. When the front oxygen sensor fails, the ECU cannot obtain information about the oxygen concentration in the exhaust pipe, thus it cannot provide feedback control for the mixture's concentration. This leads to increased fuel consumption and exhaust pollution, and the engine may experience unstable idling, misfires, surging, and other fault phenomena. 2. The automotive oxygen sensor is used to detect the state of the exhaust gas entering the three-way catalytic converter, making it an essential sensor for engines equipped with this device. Once the engine's air-fuel ratio deviates from the theoretical air-fuel ratio, the three-way catalyst's ability to purify CO, HC, and NOx will sharply decline. Therefore, to achieve the optimal exhaust purification performance for engines equipped with a three-way catalytic converter, the air-fuel ratio of the mixture must be controlled within a very narrow range around the theoretical air-fuel ratio. Currently, there are two types of oxygen sensors used in automobiles: zirconia and titanium oxide.