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:
Calling up a stored setting
•► Press and hold the relevant storage
position button 1, 2 or 3 until the seat,
steering wheel and exterior mirrors are in
the stored position.
The setting procedure is interrupted as
...
Driving systems
Display messages
Possible causes/consequences and
Solutions
Based on specific criteria, ATTENTION ASSIST has determined that the
driver is tired or paying less attentio ...
Engine emergency off
If the engine cannot be switched off as
described, observe the following procedure:
Take the fuse allocation chart out of the
vehicle document wallet.
Search for “Emergency engine shutdown”
...