Genuine OEM Audi Fuel In-Tank Transmitter Unit, part number 4F0201317. This unit is responsible for accurately measuring the fuel level within the tank and transmitting this information to the vehicle's fuel gauge. It is installed on the left side inside the fuel tank. Weighing approximately 0.40 kg and measuring 23 cm x 23 cm x 14 cm. Choosing a genuine OEM transmitter ensures accurate readings, correct electrical calibration, and robust construction resistant to fuel contaminants, providing reliable fuel level information.