Genuine OEM Audi Accessory Drive Belt, part number 079903137AA. This V-ribbed belt is a crucial component in the engine's accessory drive system, transmitting power from the crankshaft to various engine accessories such as the alternator, power steering pump, and air conditioning compressor. Positioned around multiple pulleys in the engine bay, it ensures all accessories operate simultaneously and efficiently. Constructed from high-quality, durable rubber compounds, it resists stretching, cracking, and wear under extreme temperatures and loads. Using a genuine OEM drive belt guarantees the correct length, tension, and material specifications, which are essential for preventing premature wear, slippage, and potential damage to engine accessories.