Genuine OEM Audi Reducing Agent Storage Container, part number 8R0131907C. This container is designed to safely store the reducing agent, commonly known as AdBlue or Diesel Exhaust Fluid (DEF), which is crucial for the vehicle's selective catalytic reduction (SCR) emissions system. It is integrated into the exhaust aftertreatment system, typically located near the main fuel tank. Weighing approximately 0.50 kg, this container is engineered for chemical resistance and durability. Using a genuine OEM reducing agent storage container ensures proper material compatibility with the fluid, accurate sensor integration, and leak-free operation, which are vital for maintaining emissions compliance and system integrity.