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

The purpose of an oxygen sensor in an exhaust system is to provide feedback for air-fuel mixture adjustments. This sensor measures the level of oxygen in the exhaust gases emitted from the engine. By analyzing this data, the vehicle's engine control unit (ECU) can determine whether the air-fuel mixture is too rich (too much fuel compared to air) or too lean (too much air compared to fuel).

This feedback allows the ECU to make real-time adjustments to the fuel injection system to optimize combustion efficiency, reduce emissions, and improve fuel economy. Proper air-fuel mixture is crucial for ensuring that the engine operates under optimal conditions, minimizes harmful emissions, and meets environmental regulations.

In an exhaust system, the oxygen sensor plays a vital role in the vehicle's emissions control system, working alongside other components to maintain compliance with smog regulations and support overall engine performance.