Genuine OEM Audi Engine Drive Belt Idler Pulley, part number 079903389D. This essential component guides and tensions the engine's accessory drive belt, ensuring proper alignment and consistent power transfer to various engine-driven accessories. Constructed from durable composite material with a high-quality internal bearing, it measures approximately 7cm in diameter. Using a genuine OEM idler pulley guarantees the correct dimensions, bearing quality, and material strength, which are vital for preventing belt slippage, premature wear, and noise in the accessory drive system.

Catalogue entry: CASTER.