Purity
Assuring the purity of DEF is particularly important with respect to avoiding malfunctions in the exhaust gas aftertreatment system.
If DEF is pumped out of the DEF tank, e.g.
during repair work, it must not be returned to the tank. The purity of the fluid can no longer be guaranteed.
Impurities in DEF (e.g. due to other
service products, cleaning agents or dust)
lead to:
- increased emission values
- damage to the catalytic converter
- engine damage
- malfunctions in the BlueTEC exhaust gas aftertreatment system
See also:
Activating/deactivating
Turn the SmartKey to position 2 in the ignition lock.
To switch on: press the button.
The indicator lamp in the button
lights up. Airflow and air distribution are set to automatic mode.
...
Seat belt
Display messages
Possible causes/consequences and
Solutions
After starting the engine, the red seat belt warning lamp lights up for
six seconds.
The seat belt war ...
Switching to navigation mode
Press the function button once
or
twice.
or
Select Navi in the main function bar by
sliding and turning
the COMAND
controller and press to confirm.
In both cases, you will see ...