Audi Center Reservoir Breather Hose / Line 4G0121081CP

The center reservoir breather hose (OEM part number 4G0121081CP) plays a crucial role in the coolant management system of various Audi models, including the RS7, S6, and S7 from 2014 to 2018. Located at the rear of the engine compartment, this vent tube facilitates the proper circulation of coolant, preventing pressure build-up and helping maintain optimal engine temperatures. Common issues that may warrant its replacement include cracking, wear, or damage caused by heat exposure or coolant leaks. This hose ensures seamless integration with the cooling system and interacts closely with other components such as the coolant reservoir and radiator. Alternative terminology for this part includes breather line or vent tube. Incompatible engines are not an issue, as this part is designed specifically for models featuring a 4.0L engine. Whether you're dealing with worn out components or non-functioning lines, installing a genuine OEM breather hose guarantees reliability and performance.