
Driving and operating137Deactivation
Deactivate the stop-start system
manually by pressing Î.
Deactivation is indicated when the
LED in the button illuminates.
To reactivate, press Î again; LED
extinguishes in the button. The
system is reactivated automatically
the next time the ignition is switched
on.
Note
When the fast idle function is
activated, the stop-start system is
automatically deactivated and
cannot be reactivated by pressing
Î . LED in button illuminates to
indicate deactivation and a
corresponding message may
appear in the Driver Information Centre 3 102.
Idle speed control 3 136.
AutostopManual transmission
If the vehicle is at low speed or
standstill, activate an Autostop as
follows:
● depress the clutch pedal
● move the selector lever to neutral
● release the clutch pedal
Control indicator Ï may flash if the
clutch is not released sufficiently.Manual transmission automated
If the vehicle is at a standstill, activate an Autostop as follows:
● selector lever in position N (or
A/M )
● depress brake pedal firmly
● do not accelerate
The engine will be switched off while
the ignition stays on if the required conditions are fulfilled.
An Autostop is indicated when Ï
illuminates green in the instrument
cluster 3 100.
During an Autostop, the heating
performance, power steering and
brake performance will be
maintained. Brake assist, however, is
not available 3 156.
Note
If you exit the vehicle while the
engine is in an Autostop, a warning
chime will sound as a reminder that
the engine is on standby and has not been switched off.

Driving and operating139Bus
The engine is restarted automatically
when operating the power sliding
door switch on the instrument panel
during an Autostop.
Sliding door 3 28.
Restart of the engine by the stop- start system
If one of the following conditions occurs during an Autostop, the
engine may be restarted
automatically by the stop-start
system. Control indicator Ï will flash
green in the instrument cluster during an automatic engine restart.
● the vehicle battery is discharged
● the ambient temperature is too low
● the defrosting function is activated
● the brake vacuum is not sufficient
● the brake pedal is operated repeatedly
● the vehicle starts to moveAn automatic engine restart may not
be possible if a door or the bonnet is
open.
If an electrical accessory, e.g. a
portable CD player, is connected to
the power outlet, a brief power drop during restart might be noticeable.
If the Infotainment system is active,
audio sound may briefly be reduced
or interrupted during the restart.
Fault
If control indicator Ï illuminates
yellow, or the LED illuminates in
deactivation button Î without first
being pressed to deactivate the
system, there is a fault in the stop-
start system 3 100. A corresponding
message also appears in the Driver
Information Centre 3 102.
Seek the assistance of a workshop. Warning chimes 3 103.Parking9 Warning
● Do not park the vehicle on an
easily ignitable surface. The
high temperature of the
exhaust system could ignite the
surface.
● Always apply parking brake without pressing release
button. Apply as firmly as
possible on a downhill slope or
uphill slope. Depress brake
pedal at the same time to
reduce operating force.
● Switch off the engine.
● If the vehicle is on a level surface or uphill slope, engage
first gear. On an uphill slope,
turn the front wheels away from
the kerb.
If the vehicle is on a downhill
slope, engage reverse gear.
Turn the front wheels towards the kerb.

Driving and operating143Malfunction indicator light 3 97.
AdBlue
General information The selective catalytic reduction
(BlueInjection) is a method to
substantially reduce the nitrogen
oxides in the exhaust emission. This
is achieved by injecting a Diesel
Exhaust Fluid (DEF) into the exhaust
system.
The designation of this fluid is
AdBlue ®
. It is a non-toxic, non-
flammable, colourless and odourless
fluid which consists of 32% urea and
68% water.9 Warning
Avoid contact of your eyes or skin
with AdBlue.
In case of eye or skin contact,
rinse off with water.
Caution
Avoid contact of the paintwork with AdBlue.
In case of contact, rinse off with water.
AdBlue freezes at a temperature of
approx. -11 °C. As the vehicle is
equipped with an AdBlue pre-heater,
the emissions reduction at low
temperatures is ensured. The AdBlue
pre-heater works automatically.
AdBlue gauge
In versions without AdBlue level
warnings in the Driver Information
Centre, an AdBlue gauge is present,
which shows the current AdBlue fluid
level remaining in the tank.
AdBlue gauge 3 91.
Level warnings
The AdBlue consumption is approx.
3.5 litres per 1000 km and depends
on the driving behaviour.
Version with level warnings in the
Driver Information Centre
If the AdBlue level falls below a
certain value, a level warning will be
displayed in the Driver Information
Centre 3 102.

144Driving and operating
Additionally, control indicator Õ
illuminates continuously together with a warning chime.
Refill the AdBlue tank as soon as
possible. Refer to "Refilling AdBlue"
below.
If AdBlue is not refilled within a certain
distance, further level warnings are
displayed in the Driver Information
Centre depending on the current
AdBlue level.
Engine restarts prevented
Subsequent requests to refill AdBlue
and finally the announcement that an engine restart will be prevented are
displayed in the Driver Information
Centre.Note
These restrictions are a legal
requirement.
Before the prevention of an engine
restart, a warning message with
0 km is displayed in the Driver
Information Centre, indicating that after switching off the ignition an
engine restart will be prohibited.
After the prevention of an engine
start, a warning message is displayed in the Driver Information Centre
reminding the driver that AdBlue level
is insufficient.
To allow the engine to be restarted,
the tank should be refilled completely
or with a volume of at least ten litres
of AdBlue, depending on AdBlue
consumption.Warning stages: level warnings,
engine restarts prevented 1. Y illuminates after the ignition is
switched on with warning
message LEVEL ADBLUE LOW :
Driving is possible without any
restrictions.
Refill the AdBlue tank as soon as
possible.2. Y illuminates during driving with
warning message TOP UP
ADBLUE :
Possible loss of engine power.
Refill the AdBlue tank as soon as
possible.
3. Y illuminates during driving with
warning message XXX KM STOP
ADD ADBLUE :
Vehicle speed may be limited to
20 km/h after switching the engine
off and on again until the range is
reduced to 0 km.
Refill the tank completely or with a volume of at least ten litres of
AdBlue (depending on AdBlue
consumption) as soon as
possible.
4. Y illuminates during driving with
warning message 0 KM STOP
ADD ADBLUE :
The engine cannot be restarted
after switching off the ignition.
To allow the engine to be
restarted, refill the tank
completely or with a volume of at
least ten litres of AdBlue
(depending on AdBlue

Driving and operating145consumption) as soon as
possible.
Illumination of control indicator Y may
be accompanied by a warning chime.
Warning chimes 3 103.High emission warnings
If the exhaust emission rises above a
certain value, warnings similar to the
range warnings as described above
will be displayed in the Driver
Information Centre. Control indicator
Õ illuminates continuously together
with A 3 97 and a warning chime.
Requests to have the exhaust system checked and finally the
announcement that an engine restart
will be prevented are displayed in the Driver Information Centre.
Note
These restrictions are a legal
requirement.
At an AdBlue range of 1100 km, a
warning message is displayed in the
Driver Information Centre showing
the remaining distance the vehicle
can travel before engine restarts are
prevented. This warning message is
repeated every 100 km.Seek the assistance of a workshop as
soon as possible.Warning stages: high emission
warnings 1. Y and A illuminate with warning
message CHECK ANTI-
POLLUTION :
Fault in the system that may result in a loss of engine power.
Seek the assistance of a
workshop as soon as possible.
2. Y and A illuminate with warning
message ANTIPOLLUTION xxx
KM FAIL :
Indicates that in less than 1100 km an engine restart will be
prohibited after switching off the
ignition.
This warning message will be
repeated every 100 km.
Vehicle speed may be limited to
20 km/h after switching the engine
off and on again until the range is
reduced to 0 km.Seek the assistance of a
workshop as soon as possible.
3. Y and A illuminate with warning
message ANTIPOLLUTION 0 KM
FAILURE :
The engine cannot be restarted
after switching off the ignition.
Seek the assistance of a
workshop.
Illumination of control indicators Y
and A may be accompanied by a
warning chime.
Warning chimes 3 103.
Version without level warnings in the Driver Information Centre

146Driving and operatingWhen the AdBlue gauge shows the
level is very low, control indicator Õ
first illuminates continuously, then as
AdBlue level drops to a certain
amount Õ flashes for a few seconds
then illuminates continuously.
Refill the AdBlue tank as soon as
possible. Refer to "Refilling AdBlue"
below.
Driving is possible without any
restrictions.Engine power loss
As the AdBlue level drops further,
control indicator Õ flashes for a few
seconds then illuminates
continuously, accompanied by a
warning chime and loss of engine
power.
Note
These restrictions are a legal
requirement.
If AdBlue is not refilled before the tank
is empty, Õ flashes and after the next
engine restart the vehicle speed will
be limited to approx. 20 km/h.Immediately refill the tank completely or with a volume of at least ten litres
of AdBlue, depending on AdBlue
consumption.Warning stages: level warnings,
engine power loss
1. Range A. No control indicator:
Driving is possible without any
restrictions.
2. Range B. Control indicator Y
illuminates:
Refill the AdBlue tank as soon as
possible.
3. Range C. Control indicator Y
flashes for a few seconds each
time the ignition is switched on,
then illuminates continuously:
Refill the AdBlue tank as soon as
possible.
4. Range D. Control indicator Y
flashes for a few seconds each
time the ignition is switched on
then illuminates continuously,
accompanied by a warning chime:
Loss of engine power.
Refill the tank completely or with a
volume of at least ten litres of
AdBlue (depending on AdBlue
consumption) as soon as
possible.
5. Range E. Tank is empty and Y
flashes accompanied by warning chimes:
Vehicle speed will be limited to
20 km/h after switching the engine
off and on again.
Refill the tank completely or with a
volume of at least ten litres of
AdBlue (depending on AdBlue
consumption) as soon as
possible.

Driving and operating147High emission warningsIf the exhaust emission rises above a
certain value, control indicator Õ
illuminates together with A 3 97.
Consult a workshop as soon as
possible.
If the fault is not rectified within a certain distance, Õ and A flash for
a few seconds then illuminate
continuously. Loss of engine power.
When the fault is critical, Õ and A
flash continuously and after the next
engine restart the vehicle speed will
be limited to approx. 20 km/h.
Note
These restrictions are a legal
requirement.
Seek the assistance of a workshop as soon as possible.Warning stages: high emission
warnings 1. Y and A illuminate:
Fault in the system.
Seek the assistance of a
workshop as soon as possible.2. Y and A flash when the engine
is started then illuminate
continuously:
Fault in the system resulting in a
loss of engine power.
Seek the assistance of a
workshop as soon as possible.
3. Y and A flash:
Fault in the system.
Vehicle speed will be limited to
20 km/h after switching the engine
off and on again.
Seek the assistance of a
workshop as soon as possible.
Illumination of control indicators Y
and A may be accompanied by a
warning chime.
Warning chimes 3 103.Refilling AdBlueCaution
Only use AdBlue that complies
with European standards
DIN 70 070 and ISO 22241-1.
Do not use additives.
Do not dilute AdBlue.
Otherwise the selective catalytic
reduction system could be
damaged.

Driving and operating149AdBlue canisterNote
Only use the designated AdBlue
canisters for refilling, to prevent a
topping-up of too much AdBlue.
Additionally, the fumes in the tank
are captured in the canister and do
not emerge.
Note
Since AdBlue has a limited
durability, check the date of expiry
before refilling.
1. Switch off engine and remove key
from ignition switch.
2. Open right-hand door and pull fuel
filler flap to open.3. Unscrew blue protective cap anticlockwise from the filler neck.
4. Open AdBlue canister.
5. Mount one end of the hose on the
canister and screw the other end
on the filler neck.
6. Lift the canister until it is empty, or
until the flow from the canister has stopped. This can take up to five
minutes.
7. Place the canister on the ground to empty the hose, wait 15
seconds.
8. Unscrew the hose from the filler neck.
9. Mount the protective cap and turn
clockwise until it engages.
10. Close filler flap and right-hand door.
Note
Dispose of AdBlue canister
according to environmental
requirements. Hose can be reused
after flushing with clear water before
AdBlue dries out.Note
Allow the vehicle to idle for at least
ten seconds to allow the system to
detect the AdBlue refill.
Failure to observe this procedure will
result in the system only recognising the AdBlue refill after approx.
20 minutes of driving.
If the AdBlue refill is detected
successfully, AdBlue level warnings
will disappear.
If the AdBlue refill is not detected
some time after running the engine,
seek the assistance of a workshop.
Filler cap
Only use genuine filler caps. AdBlue tank has a special filler cap.
Fault
If the system detects an operating
fault, control indicator Õ illuminates
together with A and a warning
chime. Seek the assistance of a
workshop immediately.
Depending on version, a
corresponding message may also
appear in the Driver Information
Centre 3 102.