Genuine OEM Audi Exhaust Gas Cooler Coolant Hose, part number 3C0121157AB. This specialized hose is responsible for circulating coolant to and from the exhaust gas cooler, playing a critical role in managing exhaust temperatures and supporting the emissions control system. Its specific bent shape ensures correct routing within the engine bay. Constructed from robust, heat-resistant black rubber, it weighs 0.053 kg and measures approximately 0.13 meters in length. Using a genuine OEM hose guarantees the precise fit, material integrity, and resistance to thermal stress required for the demanding environment of the exhaust gas cooling system.