See also:

Centrally locking and unlocking the vehicle from the inside
You can centrally lock or unlock the vehicle from the inside. The central locking/unlocking button does not lock or unlock the fuel filler flap. You cannot unlock the vehicle centrally from t ...

Important notes on the use of KEYLESSGO
The KEYLESS-GO key can be used like a conventional key. You can combine KEYLESS-GO functions with those of a conventional key, e.g. unlock with KEYLESS-GO and lock with the button. Always ...

Additives
Only use DEF in accordance with ISO 22241. Do not use additives with DEF and do not dilute DEF with water. This may destroy the BlueTEC exhaust gas aftertreatment system. ...