Genuine OEM Audi Belt Idler Pulley, part number 079903389A. This pulley plays a crucial role in the engine's accessory drive system by guiding and maintaining proper tension on the serpentine belt. It ensures smooth and efficient operation of various engine accessories. Weighing 0.265 kg, this pulley features a durable bearing for reliable rotation. Selecting a genuine OEM pulley guarantees the correct dimensions, bearing quality, and factory tolerance for vibration-free and long-lasting service life.