Genuine OEM Audi Coolant Hose Exhaust Gas Cooler, part number 03L121157. This hose is designed to transfer coolant, playing a vital role in regulating engine temperature by connecting components within the engine cooling system, specifically to the exhaust gas cooler. It has a weight of 0.387 kg and a length of 0.58 meters. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition, and resistance to temperature and pressure fluctuations, preventing leaks and maintaining optimal engine performance.