Genuine OEM Audi Reduction Agent Tank, part number 4L0131907D. This component is designed to securely store the reduction agent, such as AdBlue or Diesel Exhaust Fluid (DEF), which is crucial for the vehicle's selective catalytic reduction (SCR) emissions system. It ensures a consistent supply of the agent to reduce harmful nitrogen oxide emissions. Weighing approximately 0.5233 kg, this tank is constructed from durable plastic, engineered to withstand the specific chemical properties of the reduction agent. Using a genuine OEM tank guarantees proper sealing, material compatibility, and integration with the vehicle's emissions monitoring system for reliable and compliant operation.