The Vemo Knock Sensor - V10721197 is a sensor designed to detect engine knock or detonation in a vehicle's engine. It is a small, electronic device that is mounted on the engine block and monitors the vibrations of the engine. When the sensor detects abnormal vibrations, it sends a signal to the engine control unit (ECU) to adjust the timing and prevent engine damage. The Vemo Knock Sensor - V10721197 is a high-quality, durable product that is compatible with a wide range of vehicle makes and models. It is an essential component for maintaining the performance and longevity of a vehicle's engine.