Genuine OEM Audi Emissions System Breather Line, part number 4G0201992C. This component plays a vital role in the vehicle's evaporative emissions control system by allowing for the controlled venting of fuel vapors and other gases. It is typically routed along the underbody, often in conjunction with the fuel tank and charcoal canister. Weighing 0.058 kg and measuring 0.665m in length, this line is engineered to specific dimensions and material properties. Using a genuine OEM breather line ensures correct routing, proper sealing, and resistance to fuel vapors and environmental factors, which is essential for maintaining emissions compliance and preventing fuel system issues.