Genuine OEM Audi Voltage Regulator, part number 07L903803D. This critical component is responsible for maintaining a stable electrical voltage within the vehicle's charging system, protecting sensitive electronics from overvoltage and undervoltage conditions. Weighing approximately 0.104 kg, this compact unit ensures consistent power delivery. Choosing a genuine OEM voltage regulator guarantees precise calibration and reliable performance, preventing potential damage to the alternator and other electrical systems.