Genuine OEM Audi Timing Chain Tensioner, part number 06E109218AQ. This critical engine component is responsible for maintaining the correct tension on the timing chain, preventing slack and ensuring precise synchronization of the engine's camshafts and crankshaft. It is positioned on the right side of the engine assembly. Constructed from durable cast metal with integrated chain guides, it weighs approximately 0.69 kg. Using a genuine OEM tensioner ensures factory-specified spring rates and damping characteristics for reliable, long-term engine performance and reduced wear.