Glossary Term
Vane Air Flow Sensor
VAFAn older, less common design that measures the volume of air rather than its mass. A physical vane or flap inside the sensor is moved by the force of the incoming air, and a potentiometer connected to the vane's pivot measures its position, which the ECU uses to determine the airflow volume.
Vane Air Flow (VAF) sensor — an older volumetric design. Incoming air pushes a physical flap; a potentiometer measures the flap's position to determine airflow volume.