Genuine OEM Audi Reducing Agent Metering Line, part number 4G0131984AE. This component is crucial for the selective catalytic reduction (SCR) system, delivering the precise amount of reducing agent, such as AdBlue or Diesel Exhaust Fluid (DEF), to the injector. It connects directly to the injector, ensuring accurate metering for NOx reduction. Weighing 0.223 kg, this line is designed for chemical resistance and precise fitment. Choosing a genuine OEM metering line guarantees correct flow rates and reliable emissions system operation.