On-Vehicle Service: Filling
WARNING: This page is about a different car, the 1999 Audi A8, 1998 Audi A8, and 1997 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
To add washer fluid, just lift the filler cap by the small tab. See Fig 1 . After filling the container, press the cap onto the filler neck.