Genuine OEM Audi Serpentine Drive Belt, part number 059903137R. This belt is a critical engine component, responsible for driving multiple peripheral devices such as the alternator, power steering pump, and air conditioning compressor. It is located within the engine bay, connecting various pulleys. Weighing 0.254 kg and measuring 1.17 meters in length, this belt is engineered for optimal performance. Choosing a genuine OEM serpentine belt ensures the correct tension, material composition, and ribbed profile for long-lasting, quiet, and efficient power transfer, preventing premature wear and system failure.