Genuine OEM Volkswagen Alternator Poly-V-Belt, part number 05E903159B. This critical component transmits power from the engine crankshaft to drive the alternator, as well as other essential engine accessories like the power steering pump or air conditioning compressor. It is a multi-ribbed belt designed for high efficiency and durability. Weighing approximately 0.105 kg, this belt ensures reliable power transfer. Choosing a genuine OEM poly-V-belt guarantees the correct length, rib profile, and material composition for optimal tension, reduced slippage, and a long service life.