Genuine OEM Audi Accessory Drive Belt Tensioner Damper, part number 06E903133AB. This critical engine component maintains the correct tension on the accessory drive belt, ensuring the reliable operation of various engine accessories such as the alternator, power steering pump, and air conditioning compressor. Weighing approximately 0.52 kg, it is designed for durability and precise function. Using a genuine OEM tensioner guarantees factory-specified tension, preventing belt slippage or excessive wear, and ensuring a long, vibration-free service life for the accessory drive system.