What part does the oxygen sensor system primarily measure?

The oxygen sensor system primarily measures the quantity of oxygen present in the exhaust gases emitted by the engine. This measurement is critical for the proper functioning of the vehicle's engine management system. The information gathered by the oxygen sensors helps the vehicle’s computer adjust the air-fuel mixture that enters the engine, ensuring optimal combustion. By maintaining the ideal air-fuel ratio, the oxygen sensor plays a vital role in both performance optimization and emissions control.

This system contributes to improved fuel efficiency and reduced harmful emissions, as it allows the engine to run more cleanly and efficiently. When the sensors detect a rich or lean mixture, they communicate this data to the engine control unit (ECU), which can then make real-time adjustments to maintain the best possible combustion conditions.