Press phone and then ok within a second on the trip menu screen ,ign on , gets you into the service menu. Ad blue level is in there.
Yeah mines the same. I stick to 5 litres now as I read ad blue goes off and crystallises eventually.On my car - does not show level solely says "not full". I done the usual web seaches and no where can you see the level actually in the tank.
Later model cars can be accessed eg Mecredes Me, etc but on W212-026 suspect a oversight unless "techinicain only sub level".
I knowOP: replied on other side