Genuine OEM Audi Timing Chain Tensioner, part number 03H109507. This component is essential for maintaining proper tension on the engine's timing chain, which synchronizes the crankshaft and camshafts for precise valve timing. It prevents chain slack, reducing noise and preventing potential engine damage. Weighing 0.134 kg, this tensioner is designed for consistent hydraulic or mechanical operation. Choosing a genuine OEM timing chain tensioner ensures the correct spring rate, hydraulic pressure, and material quality, which are critical for engine reliability and longevity.