What is the purpose of the O2 sensor in an exhaust system?

The primary purpose of the oxygen sensor in an exhaust system is to measure the levels of oxygen in the exhaust gases. This sensor plays a vital role in managing the air-fuel mixture that enters the engine. By providing feedback to the engine control unit (ECU) about the oxygen content in the exhaust, it helps the ECU adjust the fuel injection and air intake to achieve optimal combustion efficiency.

When the oxygen levels are too high or too low, the sensor signals the ECU to make necessary adjustments to improve fuel economy and minimize exhaust emissions. This process is crucial for maintaining compliance with emission regulations and ensuring that the vehicle runs efficiently. Overall, the oxygen sensor is a key component in the vehicle's emissions control system and helps enhance overall engine performance.