Genuine OEM Volkswagen Belt Tensioner Damper, part number 057903133AH. This component absorbs vibrations and maintains proper tension on the accessory drive belt. It ensures the belt runs smoothly and efficiently, preventing slippage and premature wear. Located in the accessory drive belt system. Genuine OEM tensioner dampers are engineered for precise damping characteristics and durability, ensuring reliable operation of the alternator, A/C compressor, and other belt-driven accessories.