An air meter, or airflow meter, measures the quantity of air entering an engine, supplying data to the engine control unit for optimal fuel and ignition control. Accurate measurements are critical for efficient combustion and emission compliance.

Air meters commonly employ hot wire, hot film, or vane-type mechanisms to detect airflow. As air passes through, the sensor generates signals that the ECU uses to adjust fuel injection, ignition timing, and turbocharger operation if present.

Routine maintenance, including cleaning and inspection, ensures that the sensor remains free from dust, oil, or debris that can affect accuracy. Proper installation and calibration are essential for consistent performance.

Air meters are widely used in automotive engines and some industrial machinery. They provide real-time monitoring, contributing to smoother engine operation, reduced fuel consumption, and stable performance under various conditions.