Genuine OEM Audi Engine Coolant Hose, part number 4M0121053S. This vital component is responsible for transporting engine coolant, playing a crucial role in regulating engine temperature and preventing overheating. It is integrated into the engine cooling system. Measuring 0.14 meters in length and weighing 0.0705 kg, this hose features a complex, multi-branching design for specific routing. Using a genuine OEM hose ensures the correct material composition for resistance to heat, pressure, and coolant chemicals, preventing leaks and maintaining cooling system efficiency.