Genuine OEM Audi Belt Tensioner With Damper, part number 07D903315J. This critical component maintains proper tension on the engine's accessory drive belt, ensuring efficient power transfer to components like the alternator, power steering pump, and air conditioning compressor. The integrated damper helps to absorb vibrations and shocks, extending belt life and reducing noise. Weighing approximately 0.78 kg, it is engineered for precise tensioning. Opting for a genuine OEM belt tensioner guarantees correct spring calibration and damper performance, vital for reliable accessory function and preventing premature belt wear.