Explain the purpose of a vehicle’s O2 sensors.

The purpose of a vehicle’s O2 sensors is to monitor the levels of oxygen in the exhaust gases. This information is crucial for the engine control unit (ECU) to optimize the air-fuel mixture, ensuring that combustion occurs as efficiently as possible. By providing real-time feedback on the oxygen content, O2 sensors help the ECU make necessary adjustments to maintain an ideal fuel mixture, which is essential for achieving better fuel economy and reducing harmful emissions. The data from the O2 sensors also plays a role in the functioning of the vehicle’s emission control systems, allowing them to operate effectively and meet regulatory standards.

The other options introduce functions that are unrelated to the role of O2 sensors, as their specific purpose is strictly tied to monitoring exhaust gases and influencing fuel mixture optimization. This critical function significantly contributes to overall engine performance and environmental compliance.