Genuine OEM Audi Engine Timing Chain Tensioner, part number 03H109509A. This component is crucial for maintaining proper tension on the engine timing chain, ensuring precise valve timing and smooth engine operation. It is located within the engine's timing system. Weighing 0.0758 kg, it is engineered for durability and consistent performance. Using a genuine OEM tensioner ensures correct chain tension, preventing premature wear and potential engine damage.