Genuine OEM Audi Engine Poly V-Belt, part number 057903137AB. This essential belt transmits power from the engine crankshaft to various accessories, such as the alternator, power steering pump, and air conditioning compressor. It is located on the front of the engine. Made from high-strength, flexible rubber compounds with multiple ribs, it measures approximately 0.42 meters in length when laid flat. Using a genuine OEM poly V-belt ensures the correct tension, durability, and resistance to stretching and cracking, which is vital for the reliable operation of all driven engine accessories.