Problem
Possible causes/consequences and
M
M
Solutions
The fuel filler flap cannot
be opened.
The fuel filler flap is not unlocked.
X
Unlock the vehicle (
Y
page 81).
The key battery is weak or discharged.
X
Unlock the vehicle using the emergency key element (
Y
page 83).
The fuel filler flap is unlocked, but the opening mechanism is jammed.
X
Consult a qualified specialist workshop.
AdBlue
®
(BlueTEC vehicles only)
General notes
To function properly, BlueTEC exhaust gas after-
treatment must be operated with the reducing
agent AdBlue
®
. Topping up AdBlue
®
is part of
the maintenance work. Under normal operating
conditions, a full tank of AdBlue
®
should last
until the next service due date.
When the supply of AdBlue
®
is down to approx-
imately 3.8 l, the
Refill AdBlue See Own‐
Refill AdBlue See Own‐
er's Manual
er's Manual
message is shown in the multi-
function display.
X
Add at least 3.8 l of AdBlue
®
.
X
Switch on the ignition for at least 60 seconds.
X
Start the engine.
i
You can also have the AdBlue
®
tank refilled
at a qualified specialist workshop.
Before driving your vehicle outside Europe, have
the AdBlue
®
supply checked at a qualified spe-
cialist workshop.
Further information about BlueTEC exhaust gas
aftertreatment and about AdBlue
®
can
be obtained from any Mercedes-Benz Service
Centre.
Important safety notes
AdBlue
®
is a water-soluble fluid for the exhaust
gas aftertreatment of diesel engines. It is:
R
non-toxic
R
colourless and odourless
R
non-flammable
If you open the AdBlue
®
tank, small amounts of
ammonia vapour may be released.
Ammonia vapours have a pungent odour and are
particularly irritating to the skin, mucous mem-
branes and eyes. You may experience a burning
sensation in your eyes, nose and throat. You
may also experience coughing and watery eyes.
Do not inhale any ammonia vapours that may be
released. Only fill the AdBlue
®
tank in well-ven-
tilated areas.
Do not swallow AdBlue
®
or let it come into con-
tact with skin, eyes or clothing. Keep AdBlue
®
away from children.
If you or others come into contact with AdBlue
®
,
observe the following:
R
immediately rinse AdBlue
®
off your skin with
soap and water.
R
if AdBlue
®
comes into contact with your eyes,
immediately rinse them thoroughly with clean
water. Seek medical attention immediately.
R
if AdBlue
®
is swallowed, immediately rinse
your mouth out thoroughly. Drink plenty of
water. Seek medical attention immediately.
R
change immediately out of clothing that has
come into contact with AdBlue
®
.
!
Only use AdBlue
®
in accordance with
ISO 22241. Do not mix any additives with
AdBlue
®
, and do not dilute AdBlue
®
with
water. This may destroy the BlueTEC exhaust
gas aftertreatment system.
!
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.
Fluctuations in capacity will thus be avoided.
Filling a vehicle standing on an uneven sur-
face is not permitted. There is a danger of
overfilling, which can cause damage to Blue-
TEC exhaust gas aftertreatment components.
166
Refuelling
Driving
and
parking
