Genuine OEM Audi Belt Tensioner Damper, part number 057903133L. This component is crucial for maintaining consistent and proper tension on the engine's accessory drive belt system. It works within the belt tensioner assembly to absorb vibrations and prevent belt slippage or excessive wear. Weighing approximately 0.61 kg, it is engineered for durability. Choosing a genuine OEM belt tensioner damper ensures correct belt tension, reduces noise, and extends the life of the belt and associated pulleys.