Problems with the fuel and fuel tank
If your vehicle is losing fuel, the fuel lines or the
fuel tank are defective:
X
Turn the key immediately to position
0 in the
ignition lock and remove it.
X
Do not restart the engine under any circum-
stances.
X
Consult a qualified specialist workshop.
If the fuel tank has been run dry, after refuelling
carry out the following steps:
X
Before starting the engine: switch on the igni-
tion three or four times.
X
Turn the key to position
2 in the ignition lock
(
Y
page 159).
The
%
preglow indicator lamp in the instru-
ment cluster lights up briefly.
X
Once the
%
preglow indicator lamp goes
out, turn the key to position
3 in the ignition
lock and release it as soon as the engine is
running.
You can start the diesel engine without preglow
when the engine is warm.
AdBlue
®
General notes
To function properly, the exhaust gas aftertreat-
ment in BlueTEC vehicles must be operated with
the NOx reducing agent AdBlue
®
(
Y
page 33).
When the supply of AdBlue
®
is down to a reserve
of approximately 6.5 l, the first warning mes-
sage
Refill AdBlue See Owner’s Manual
is
shown in the display.
Have the vehicle's AdBlue
®
tank refilled at a
qualified specialist workshop. However, you can
also top up the AdBlue
®
tank:
R
with the pump nozzle at an AdBlue
®
filling
pump (
Y
page 175)
R
with an AdBlue
®
refill canister (
Y
page 176)
R
with AdBlue
®
refill bottles (
Y
page 176)
Before you travel outside Europe, check the
AdBlue
®
supply and get advice from a qualified
specialist workshop.
Further information on exhaust gas aftertreat-
ment in BlueTEC
®
vehicles as well as informa-
tion on AdBlue
®
can be obtained at a Mercedes-
Benz Service Centre.
Low ambient temperatures
AdBlue freezes at a temperature of approx-
imately -11 †. The vehicle is equipped with an
AdBlue
®
preheating system at the factory. Win-
ter operation can thus be guaranteed even at
temperatures below -11 †.
If you top up AdBlue
®
at temperatures under
-11 †, the AdBlue
®
level in the multifunction
display may not be displayed correctly. If the
AdBlue
®
is frozen, drive for at least 20 minutes
and then park the vehicle for a minimum of
30 seconds, so that the level is correctly dis-
played.
Important safety notes
!
Only use AdBlue
®
which meets the
ISO 22241 standard.
Do not mix AdBlue
®
with any additives and do
not dilute AdBlue
®
with water. Exhaust gas
aftertreatment may otherwise not function
correctly and its components may be dam-
aged.
!
In order to fill the AdBlue
®
tank, the vehicle
must be parked on a level surface. The
AdBlue
®
tank can only be filled as intended
with the vehicle parked on a level surface. In
this way, differences in filling quantities can
be avoided.
Filling a vehicle standing on an uneven sur-
face is not permitted. There is a danger of
overfilling. The components of the exhaust
gas aftertreatment system may be damaged
as a result.
!
Surfaces which have come into contact with
AdBlue
®
while refilling should be rinsed
immediately with water, or remove AdBlue
®
with a moist cloth and cold water. If AdBlue
®
has already crystallised, use a sponge and
cold water to clean the area. AdBlue
®
residue
crystallises after a certain amount of time and
soils the affected surfaces.
!
AdBlue
®
is not a fuel additive and must not
be added to the fuel tank. If AdBlue
®
is added
to the fuel tank, this can lead to engine dam-
age.
If you open the AdBlue
®
tank, small amounts of
ammonia vapour may be released.
Ammonia vapours have a pungent smell and are
particularly irritating to skin, mucous mem-
174
Refuelling
Driving and parking
