Genuine OEM Audi Timing Belt Tensioner Pulley, part number 06D109243C. This essential component is responsible for maintaining the correct tension on the timing belt, which is vital for precise engine valve timing and overall engine performance. It is located within the engine's timing system, often featuring an eccentric or hydraulic mechanism for adjustment. Weighing approximately 0.462 kg, this tensioner pulley measures 85mm in length, 80mm in width, and 45mm in height. Opting for a genuine OEM tensioner pulley guarantees factory-specified spring rates, bearing quality, and mounting precision, preventing premature belt wear and ensuring long-term engine reliability.