Dont remember exactly, but I used one of the two and it worked for my vtg:
The easiest reset is using ISTA. Scan the vehicle and then select "vehicle management" tab then select "service functions" then go to
"Power train" then select " Transfer box/ transmission control" then select "repair." Click on display and this service function will take you through the transfer case reset.
Fahrzeugbehandlung -> Fehlersuche -> Antrieb -> Getriebe -> Prüfplan berechnen .....dann Prüfplan
abarbeiten bei dem Getriebefehler!
Hope this helps & cheers
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