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 opening the filler cap of the DEF tank
ammonia gas vapors may escape. Refill DEF
in a well ventilated area only. Ammonia gas
vapors have a pungent odor and are
particularly irritating for your skin, mucous
membranes, and eyes. Inhaling ammonia gas
vapors will cause burning eyes, nose, and
throat, as well as coughing and watering eyes.
See also:
Restoring the factory settings
Press the
and
buttons simultaneously for
approximately six seconds until the battery check lamp flashes twice. ...
Problems with the seat ventilation
The seat ventilation has switched off
prematurely. The vehicle's electrical system
voltage is too low because too many electrical
consumers are switched on.
Switch off electrical consumers whi ...
Additives in gasoline
One of the main problems of poor fuel quality is the forming
of deposits that are caused during the gasoline combustion process. Mercedes-Benz
recommends that you use fuel brands that have the add ...