Genuine OEM Audi Belt Tensioner Damper, part number 078903133AB. This crucial component is responsible for dampening vibrations and maintaining consistent, optimal tension on the engine's accessory drive belt. It ensures the smooth and efficient operation of various engine accessories like the alternator and power steering pump. Constructed from robust metal and rubber, it weighs 1.272 kg. Choosing a genuine OEM belt tensioner damper guarantees the correct spring rate, damping characteristics, and durable materials for reliable, long-lasting performance and prevention of premature belt wear or accessory damage.