What is the function of an oxygen sensor in a fuel metering system?

The function of an oxygen sensor in a fuel metering system is primarily to help the engine control unit (ECU) adjust the air-fuel mixture. The oxygen sensor measures the level of oxygen present in the exhaust gases as they exit the engine. This information is crucial because it allows the ECU to determine whether the engine is running rich (too much fuel) or lean (too little fuel). By interpreting the data from the oxygen sensor, the ECU can make real-time adjustments to the fuel injection system, optimizing the air-fuel mixture for efficient combustion.

This adjustment process is vital for maintaining engine performance, improving fuel efficiency, and reducing emissions. An ideal air-fuel ratio is essential for the engine to operate smoothly and effectively, and the oxygen sensor plays a key role in achieving that balance.