Genuine OEM Audi Timing Chain Guide Rail with Tensioner, part number 06M109450R. This critical component guides the engine's timing chain and maintains proper tension, ensuring precise valve timing and preventing chain slack. It is positioned on the right side of the engine. Weighing 0.495 kg, this assembly is engineered from durable materials to withstand continuous operation and high temperatures. Using a genuine OEM guide rail and tensioner ensures accurate chain alignment and optimal tension, vital for engine reliability and preventing catastrophic timing failures.