Genuine OEM Audi Engine Belt Tensioner Damper, part number 05A903133C. This essential component is responsible for maintaining the correct tension on the engine's accessory drive belt, preventing slippage and ensuring efficient operation of connected components like the alternator and power steering pump. It is located within the engine's belt drive system. Weighing approximately 1.25 kg, this damper is built to precise factory specifications. Opting for a genuine OEM tensioner damper guarantees the correct spring rate and damping characteristics, crucial for preventing premature belt wear and ensuring quiet, reliable performance.