Genuine OEM Volkswagen Fuel System Leak Diagnosis Pump, part number 1K0906201D. This critical component is part of the vehicle's fuel and emissions system. Its primary function is to test the fuel system for any leaks, ensuring compliance with emissions regulations and preventing fuel vapor loss. The assembly includes the pump, associated hoses, and a canister mounted on a metal bracket. A genuine OEM leak diagnosis pump provides accurate testing and reliable performance, crucial for maintaining vehicle efficiency and environmental standards.