Page 129 of 225

Driving and operating127The engine will be switched off whilethe ignition stays on.
An Autostop is indicated by the
needle at the AUTOSTOP position in
the tachometer.
During an Autostop, the heating, power steering and brake
performance will be maintained.
Air conditioning system may or may
not inhibit the stop-start system
according to the cooling performance.
Caution
The steering assist can be
reduced during an Autostop.
Conditions for an Autostop
The stop-start system checks if each
of the following conditions is fulfilled.
● The stop-start system is not manually deactivated
● the bonnet is fully closed
● the driver's door is closed or the driver's seat belt is fastened
● the vehicle battery is sufficiently charged and in good condition
● the engine is warmed up
● the engine coolant temperature is
not too high or low
● the engine exhaust temperature is not too high, e.g. after driving
with high engine load
● the ambient temperature is not too low
● the defrosting function is not activated
● the climate control system does not inhibit an engine stop
● the brake vacuum is sufficient● the self-cleaning function of the diesel particle filter is not active
● the vehicle has moved since the last Autostop
Otherwise an Autostop will be
inhibited.
Certain settings of the climate control
system may inhibit an Autostop. See
"Climate control" chapter for more
details 3 116.
Immediately after motorway driving
an Autostop may be inhibited.
New vehicle running-in 3 124.
Vehicle battery discharge protection
To ensure reliable engine restarts,
several vehicle battery discharge
protection features are implemented
as part of the stop-start system.
Restart of the engine by the driver Depress the clutch pedal to restart the
engine.
The engine start is indicated by the
needle at the idle speed position in
the tachometer.
Page 130 of 225

128Driving and operatingIf the selector lever is shifted out of
neutral before depressing the clutch
first, control indicator - illuminates.
Control indicator - 3 90.
Restart of the engine by the stop- start system
The selector lever must be in neutral to enable an automatic restart.
If one of the following conditions occurs during an Autostop, the
engine will be restarted automatically
by the stop-start system.
● The stop-start system is manually deactivated
● the bonnet is opened
● the driver's seat belt is unfastened and the driver's door
is opened
● the engine temperature is too low
● the charging level of the vehicle battery is below a defined level
● the brake vacuum is not sufficient
● the vehicle is driven at least at walking speed
● the defrosting function is activated● the climate control systemrequests an engine start
● the air conditioning is manually switched on
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.
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 the electrical parking brake.
Pull switch m.
The electric parking brake is
applied when control indicator
m illuminates 3 85.
For maximum force, e.g.
parking with a trailer or on
inclines, pull switch m twice.
● Switch off the engine.
● If the vehicle is on a level surface or uphill slope, engage
first gear or move the selector
lever to P before removing the
ignition key. On an uphill slope, turn the front wheels away from
the kerb.
If the vehicle is on a downhill
slope, engage reverse gear or
move the selector lever to P
before removing the ignition
key. Turn the front wheels
towards the kerb.
● Close windows and sunroof.
● Turn the ignition key to position
LOCK , push key into ignition
switch and remove.
For vehicles with automatic
transmission, depress foot
brake and shift into P before
pushing key into ignition switch and removing.
Turn the steering wheel until
the steering wheel lock is felt to
engage.
Page 131 of 225

Driving and operating129● Lock the vehicle by pressing p
on the radio remote control 3 22.
Activate the anti-theft alarm
system 3 26.Engine exhaust9 Danger
Engine exhaust gases contain
poisonous carbon monoxide,
which is colourless and odourless and could be fatal if inhaled.
If exhaust gases enter the interior
of the vehicle, open the windows.
Have the cause of the fault
rectified by a workshop.
Avoid driving with an open load
compartment, otherwise exhaust
gases could enter the vehicle.
Malfunction indicator light 3 84.
Diesel particle filter
The diesel particle filter system filters
harmful soot particles out of the
exhaust gases. The system includes
a self-cleaning function that runs
automatically during driving without
any notification.
The filter is cleaned by periodically
burning off the soot particles at high
temperature. This process takes
place automatically under set driving
conditions and may take more than
15 minutes. Autostop is not available
and fuel consumption may be higher
during this period. The emission of
smells and smoke during this process is normal.
Under certain driving conditions, e.g.
short distances, the system cannot
clean itself automatically.
Page 132 of 225

130Driving and operatingIf cleaning of the filter is required andprevious driving conditions did not
enable automatic cleaning, it will be
indicated by control indicator %
3 88.
% illuminates, accompanied by a
warning chime, when diesel particle
filter is full. Start cleaning process as
soon as possible.
% flashes when diesel particle filter
has reached the maximum filling level. Start cleaning process
immediately to avoid damage to the
engine. A warning chime sounds
every 3 minutes until the cleaning
process is complete.
Cleaning process To activate the cleaning process,
continue driving, keeping engine
speed above 2000 revolutions per
minute. Shift down if necessary.
Diesel particle filter cleaning is then
started.
If control indicator Z illuminates
additionally in the instrument cluster
when the engine is running, there
may be a fault in the diesel particlefilter 3 84. Cleaning is not possible,
seek the assistance of a workshop
immediately.Caution
If the cleaning process is
interrupted, there is a risk of
provoking severe engine damage.
Cleaning takes place quickest at high engine speeds and loads.
Do not switch off the engine until the
cleaning process is complete. This is
indicated by the extinguished control
indicator %.
Catalytic converter
The catalytic converter reduces the
amount of harmful substances in the
exhaust gases.
Caution
Fuel grades other than those listed 3 207 could damage the catalytic
converter or electronic
components.
Unburnt fuel will overheat and
damage the catalytic converter.
Therefore avoid excessive use of the starter, running the fuel tank
dry and starting the engine by
pushing or towing.
In the event of misfiring, uneven
engine running, a reduction in engine performance or other unusual
problems, have the cause of the fault
rectified by a workshop as soon as
possible. In an emergency, driving
can be continued for a short period,
keeping vehicle speed and engine
speed low.
Malfunction indicator light 3 84.
Page 133 of 225

Driving and operating131AdBlue
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.
Note
AdBlue Ⓡ is a registered trademark
of the Verband der
Automobilindustrie e.V. (VDA).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.
The typical AdBlue consumption is
approx. two litres per 1000 km, but
can also be higher depending on
driving behaviour (e.g. high load or
towing).
Level warnings
If the AdBlue level falls below a
certain value, a level warning (e.g.
"AdBlue Range: 2400 km") will be
shown in the Driver Information
Centre 3 91, located in the centre of
the instrument cluster.
Refill the tank with a volume of at least
10 litres of AdBlue as soon as
possible. Refer to " Refilling AdBlue"
below.
Driving is possible without any
restrictions.
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132Driving and operatingIf AdBlue is not refilled within a certaindistance, further level warnings are
shown in the Driver Information
Centre, depending on the current
AdBlue level.
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.At an AdBlue range of 900 km, the following warning messages are
alternately displayed in the Driver
Information Centre:
● AdBlue Low Refill Now
● Engine Restart Prevented in
900 km
Additionally, control indicator Y
flashes continuously.
Engine restarts prevented
Before the prevention of an engine
restart, the following warning
messages are alternately displayed in the Driver Information Centre:
● AdBlue Empty Refill Now
● Engine Will Not Restart
These messages indicate that after
switching off the ignition, an engine
restart will be prohibited.
Additionally, control indicator Y
flashes continuously.
After the prevention of an engine
start, a warning message (e.g. "Refill
AdBlue To Start Vehicle") 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 filled with at least
10 litres of AdBlue.
High emission warningsIf 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.
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.
Page 135 of 225

Driving and operating133Note
These restrictions are a legal
requirement.
Seek the assistance of a workshop as
soon as possible.
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.
Note
If AdBlue must be refilled at very low temperatures, the refilling of AdBlue
may not be detected by the system.
In this case, park the vehicle in a
space with a higher ambient
temperature until AdBlue is
liquefied.
Note
If engine starting is prohibited due to low AdBlue level, we recommend
refilling the tank completely or with a volume of at least ten litres of AdBlue(depending on AdBlue
consumption).
Avoid minor top-ups (e.g. less than five litres), otherwise the system
may not detect a refill.
Note
When unscrewing the protective cap
from the filler neck, ammonia fumes
may emerge. Do not inhale as the
fumes have a pungent smell. The
fumes are not harmful by inhalation.
The vehicle must be parked on a level surface.
The filler neck for AdBlue is located at
the rear bumper on the left-hand side of the vehicle.9 Danger
Vehicles with stop-start system:
The engine must be switched off
and the ignition key removed, to
avoid risk of engine being
restarted automatically by the
system.
Capacities 3 211.
Page 136 of 225

134Driving and operatingFilling station9Danger
Follow the operating and safety
instructions of the filling station
when refilling AdBlue.
1. Switch off engine and remove key
from ignition switch.
2. Disengage the cover using a suitable screwdriver and remove.
3. Unscrew protective capanticlockwise from the filler neck.
4. Fully insert the pump nozzle intothe filler neck and switch it on.
5. When refilling is complete, mount the protective cap and turn
clockwise until it engages.
6. Replace the cover by inserting the
right side first.
AdBlue canister Note
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. Disengage the cover using a suitable screwdriver and remove.
3. Unscrew protective cap anticlockwise from the filler neck.