Genuine OEM Audi Knock Sensor, part number 07L905377A. This essential sensor is mounted directly on the engine block to monitor for abnormal combustion events, such as knocking or pre-ignition. It transmits precise data to the engine control unit, allowing for real-time adjustments to ignition timing to prevent engine damage and ensure efficient operation. The sensor assembly has a length of approximately 0.265 meters. Installing a genuine OEM knock sensor guarantees the correct sensitivity and signal output, crucial for accurate engine diagnostics and maintaining peak engine performance.