See also:

High outside temperatures
If DEF heats up to over 122 °F (50 °C ) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result. WARNING When o ...

Switching COMAND on/off
Press the function button on the center console. If you switch off COMAND, playback of the current audio or video source will also be switched off. You cannot switch off COMAND while mak ...

Correct use of the seat belts
WARNING USE SEAT BELTS PROPERLY Seat belts can only work when used properly. Never wear seat belts in any other way than as described in this section, as that could result in serious i ...