Genuine OEM Audi Alternator Belt Idler Pulley, part number 079903341F. This component is crucial for maintaining proper tension and guiding the alternator belt within the accessory drive system. It ensures smooth and efficient power transfer to the alternator and other engine accessories. Weighing approximately 0.20 kg with a diameter of 79mm, this pulley is engineered to factory specifications. Using a genuine OEM idler pulley ensures precise fitment, correct belt alignment, and long-term durability, preventing premature belt wear and potential system failures.