Genuine OEM Audi Engine Knock Sensor, part number 07C905377AH. This critical sensor is mounted on the engine block and detects abnormal vibrations caused by engine knocking or pre-ignition. It sends signals to the engine control unit, which then adjusts ignition timing to prevent engine damage and optimize combustion efficiency. The sensor assembly has a length of approximately 0.55 meters. Choosing a genuine OEM knock sensor ensures precise calibration and signal characteristics, which are vital for accurate engine management and reliable protection against harmful detonation.