Genuine OEM Audi Knock Sensor, part number 079905377H. This sensor detects engine knocking, allowing the engine control unit to adjust ignition timing for optimal performance and prevent damage. It is positioned on the rear left side of the engine. Weighing approximately 0.082 kg, it features a durable housing and electrical connector. Genuine OEM sensors provide exact calibration and signal characteristics, crucial for accurate engine management and reliable operation.