Genuine OEM Audi Upper Camshaft Timing Chain, part number 03H109503. This critical component synchronizes the rotation of the camshaft and crankshaft, maintaining precise engine timing. It is positioned as the upper camshaft timing chain within the engine assembly. Weighing approximately 0.41 kg, its compact design measures 0.11m x 0.11m x 0.014m. Choosing a genuine OEM timing chain ensures factory-specified material strength and link precision for reliable, long-term engine operation.