Genuine OEM Audi AdBlue Fuel Tank Cap, part number 5Q0131980C. This cap is specifically designed to seal the AdBlue (Diesel Exhaust Fluid) filler neck, preventing contamination, evaporation, and spillage of the fluid. Its distinct blue color and "AdBlue / DEF" marking ensure correct usage. Using a genuine OEM cap guarantees a perfect seal and chemical resistance to AdBlue, which is crucial for the proper functioning of the emissions reduction system.

Catalogue entry: COVER blue.