Air/Fuel Ratio Sensor: Essential for Engine Efficiency

The air/fuel ratio sensor is a critical component of the vehicle's emission control system. It ensures that the engine receives the right mix of air and fuel, which is essential for optimal combustion and performance ?. By accurately measuring these ratios, the sensor helps maintain the balance needed for efficient engine operation and reduced emission levels.

Functionality of the Air/Fuel Ratio Sensor

The air/fuel ratio sensor operates by monitoring the oxygen levels in the exhaust gases. It sends real-time data to the engine control unit (ECU),which in turn adjusts the fuel mixture to maintain the ideal stoichiometric balance ⚙️. This process is crucial for achieving peak efficiency, better fuel economy, and cleaner exhaust emissions.

Consequences of a Malfunctioning Sensor

If the air/fuel ratio sensor fails, the car's engine may experience poor fuel economy, increased emissions, and potential damage due to improper fuel mixtures. Symptoms could include rough idling, stalling, and a noticeable decrease in engine performance. The "check engine" light may also be triggered, indicating the need for immediate attention ?.

Compatible Models

• Impreza
• Forester