Genuine OEM Audi Pedestrian Impact Crash Sensor, part number 4N0959121F. This critical sensor is designed to detect impacts, specifically those involving pedestrians, and trigger the vehicle's active and passive safety systems. It plays a vital role in collision mitigation and occupant protection. Opting for a genuine OEM sensor guarantees accurate calibration, consistent signal characteristics, and reliable performance, which are essential for the correct and timely deployment of safety features.