Genuine OEM Volkswagen Knock Deflector with Wiring, part number 07C905377N. This component functions as a knock sensor, designed to detect abnormal combustion events (knocking or pinging) within the engine. Upon detection, it sends an electrical signal to the engine control unit (ECU), which then adjusts ignition timing to prevent engine damage and maintain optimal performance. Genuine OEM sensors provide the precise calibration and signal integrity required for accurate engine management.