Genuine OEM Audi Vehicle Speed Sensor, part number 01F409191. This electronic sensor is responsible for accurately measuring the vehicle's road speed, providing essential data to the engine control unit, speedometer, and other onboard systems. It weighs approximately 0.031 kg. Choosing a genuine OEM speed sensor ensures precise calibration, reliable signal characteristics, and seamless integration with the vehicle's electronics, critical for accurate speed readings and proper system function.