Genuine OEM Audi Engine Coolant Hose, part number 04L121157AA. This hose is responsible for transporting vital coolant within the engine cooling system, ensuring efficient heat exchange and maintaining optimal engine operating temperatures. It is positioned on the right side of the engine assembly. Constructed from durable, heat-resistant rubber, it is designed for precise routing and secure connections. Using a genuine OEM coolant hose guarantees the correct routing geometry, material resistance to engine fluids, and reliable performance under varying temperature and pressure conditions.