Genuine OEM Audi Timing Chain Tensioner, part number 079109217R. This vital engine component is responsible for maintaining the correct tension on the timing chain, ensuring precise synchronization of the engine's camshafts and crankshaft. It is located within the engine's timing system. Constructed from durable metal and wear-resistant plastic, it weighs approximately 0.466 kg. Using a genuine OEM timing chain tensioner is crucial for accurate engine timing, preventing costly damage and ensuring reliable, long-term engine performance.