Exhaust gas oxygen sensor ( ego ) which is installed in the exhaust pipe of the engine is a significant component in the electronic fuel injection . it has the ability to probe the concentration of oxygen in the exhaust pipe , and can transfer concentration signal to voltage signal which is passed to electronic control unit ( ecu ) . in this way the air - fuel ratio can be controlled to the strait range of stoichiometrical point and the three - way catalytic converter consequently can work better 车用氧传感器是电喷系统的关键部件，安装在发动机的排气管上，能够探测排气管中的氧气的浓度，然后将浓度信号转变成电压信号并传送给电控单元ecu ，从而把空燃比控制在理论空燃比附近，配合三元催化反应器进行后处理净化。
