Genuine OEM Volkswagen Knock Sensor, part number 07K905377E. This vital sensor is responsible for detecting abnormal combustion events, such as engine knocking or pre-ignition, by monitoring vibrations within the engine block. Upon detection, it sends signals to the engine control unit (ECU), which then adjusts ignition timing to prevent engine damage and optimize performance. Weighing 0.128 kg, this genuine OEM sensor provides precise and reliable signal characteristics, ensuring accurate engine management and protection against harmful detonation.