High Quality Engine System Throttle Body 030133062D For VW Primary Function & Purpose: Controls Air Intake: It is installed on the engine's intake pipe and precisely controls the amount of air entering the engine by opening and closing an internal valve (the throttle plate). Manages Engine Power: Based on how far the driver presses the accelerator pedal (the signal), the Engine Control Unit (ECU) commands the throttle body to open to a specific angle. More air entering allows