Genuine OEM Audi Poly V Rib Belt, part number 03L903137J. This multi-ribbed belt is crucial for transmitting power from the engine's crankshaft to various accessory components, such as the alternator, power steering pump, and air conditioning compressor. Its robust construction ensures reliable power transfer. Genuine OEM belts are manufactured from high-quality, durable rubber compounds, engineered to resist stretching, cracking, and wear, providing optimal tension and long service life for critical engine accessories.