Genuine OEM Volkswagen Reducing Agent Tank Wiring Harness, part number 5Q0971405. This wiring harness connects the reducing agent tank (e.g., for AdBlue/DEF) to the vehicle's electrical system, enabling communication with sensors and control units. It ensures proper monitoring and operation of the emissions reduction system. Weighing 0.332 kg, this harness features multiple connectors and protective sheathing. Choosing a genuine OEM harness guarantees correct routing, precise connector fitment, and durable insulation for reliable electrical performance in emissions control.