Genuine OEM Audi Voltage Regulator, part number 06E903803T. This critical electronic component controls the electrical system's voltage output, ensuring a stable power supply to all vehicle electronics and preventing damage from overvoltage. It is typically integrated with the alternator. Weighing 0.137 kg, this genuine OEM voltage regulator provides precise voltage control and reliable performance, crucial for the longevity of the vehicle's electrical system and battery.