A useful website for on-line access to workshop information and service procedures is erWin:
https://erwin.volkswagen.de/erwin/showHome.do;jsessionid=056A7B0172A67377F635784D520F5209.ASTPVWE1
"erWin is the
Electronic
Repair and
Workshop
Information service from Volkswagen AG for independent garages, vehicle fleets and all other companies which undertake professional level repairs and servicing to Volkswagen cars. erWin also is available to private persons who want to repair their Volkswagen vehicle themselves.
erWin shows you within seconds everything you need to repair and maintain your Volkswagen vehicle. The information is provided online. Always informed. Always up-do-date.
erWin contains information specific to individual vehicles, e.g. technical product information or maintenance tables. You have to log on first for this application.
erWin knows even the smallest differences between the models.
Because erWin contains all the workshop manuals from Volkswagen AG, together with many other useful information to improve service.
"