Throttle position sensor (or throttle opening angle sensor) is fixed on the throttle body that regulates the amount of air fed to the engine depending on the accelerator pedal position.

This device measures the rotation angle of the throttle valve to control gasoline engines.

Functions of the throttle position sensors vary, from a simpler system that only manages the idle speed, fuel injection cut and the full load regime, to more complex ones that carefully control the acceleration phases, optimising both power and ignition advance.