Genuine OEM Audi Alternator Idler Pulley, part number 059903341AH. This pulley is specifically designed to guide the serpentine belt, ensuring proper alignment and smooth operation of the alternator within the engine's accessory drive system. It plays a crucial role in maintaining consistent power generation. Weighing 0.245 kg, this metallic, ribbed pulley is built for durability. Choosing a genuine OEM idler pulley ensures precise bearing quality and robust construction, vital for preventing belt slippage, noise, and premature wear of the accessory drive components.