
The Start/Stop button must be inserted in theignition lock and the SmartKey must be in the
vehicle.
Pressing the Start/Stop button several times
in succession corresponds to the different
SmartKey positions in the ignition lock. This is
only the case if you are not depressing the
brake pedal.
If you depress the brake pedal and press the
Start/Stop button, the engine starts immedi- ately.
The Start/Stop button can be removed from
the ignition lock. Then, you can insert the
SmartKey into the ignition lock.
iYou do not have to remove the Start/Stop
button from the ignition lock when you
leave the vehicle. You should, however,
always take the SmartKey with you when
leaving the vehicle. The vehicle can be star-
ted with the Start/Stop button if the Smart-
Key is in the vehicle. Electrically powered
equipment can be operated.
:Start/Stop button
;Ignition lock
X Insert Start/Stop button : into ignition
lock ;.
iWhen you insert Start/Stop button :
into ignition lock ;, the system needs
approximately 2 seconds recognition time.
You can then use Start/Stop button :.
Start/Stop button =
USA only
?Canada only
If Start/Stop button : has not yet been
pressed, this corresponds to the SmartKey
being removed from the ignition.
X To switch on the power supply: press
Start/Stop button : once.
You can now activate the windshield wip-
ers, for example.
iIf you then open the driver's door when in
this position, the power supply is deactiva-
ted.
X To switch on the ignition: press Start/
Stop button : twice.
iThe power supply is switched off again if:
R the driver's door is opened and
R you press Start/Stop button : once
when in this position.
As soon as the ignition is switched on, all the
indicator lamps in the instrument cluster light up. If an indicator lamp does not go out afterstarting the engine or lights up while driving,
see ( Y page 262).
150Driving
Driving and parking

Starting the engine
Important safety notes
GWARNING
If children are left unsupervised in the vehicle, they could:
R open the doors, thus endangering other
people or road users.
R get out and disrupt traffic.
R operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
R release the parking brake.
R shifting the automatic transmission out of
park position P
R Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases leads to poisoning. There is a risk of fatal injury. Therefore never leave
the engine running in enclosed spaces with-
out sufficient ventilation.
GWARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system orparts of the engine that heat up. There is a risk
of fire.
Carry out regular checks to make sure that
there are no flammable foreign materials in
the engine compartment or in the exhaust
system.
! Do not depress the accelerator when
starting the engine.
General notes
iVehicles with a gasoline engine: the
catalytic converter is preheated for up to
30 seconds after a cold start. The sound of the engine may change during this time.
Automatic transmission
X Shift the transmission to position P.
The transmission position display in the
multifunction display shows P.
iYou can also start the engine when the
transmission is in position N.
Starting procedure with the SmartKey
iTo start the engine using the SmartKey
instead of KEYLESS-GO, pull the Start/
Stop button out of the ignition lock.
X To start a gasoline engine: turn the
SmartKey to position 3 in the ignition lock
( Y page 149) and release it as soon as the
engine is running.
X To start a diesel engine: turn the Smart-
Key to position 2 in the ignition lock
( Y page 149).
The % preglow indicator lamp in the
instrument cluster lights up.
X When the % preglow indicator lamp
goes out, turn the SmartKey to position 3
( Y page 149) and release it as soon as the
engine is running.
iYou can start the engine without preglow
if the engine is warm.
Using KEYLESS-GO to start the engine
You can start the engine if a valid SmartKey
with the integrated KEYLESS-GO function is in the vehicle. Always take the SmartKey with
you when leaving the vehicle, even if you only
leave it for a short time. Pay attention to the
important safety notes.
iThe Start/Stop button can be used to
start the vehicle without inserting the
SmartKey into the ignition lock. The Start/
Driving151
Driving and parking
Z

Problems with the engine
ProblemPossible causes/consequences and M Solutions
The engine does not
start. The starter motor
can be heard.R
There is a malfunction in the engine electronics.
R There is a malfunction in the fuel supply.
X Turn the SmartKey back to position 0 in the ignition lock before
attempting to start the engine again.
or
X Press the Start/Stop button repeatedly until all indic ator lamps
in the instrument cluster go out.
X Try to start the engine again ( Y page 151). Avoid excessively
long and frequent attempts to start the engine as these w ill drain
the battery.
If the engine does not start after several attempts: X Consult a qualified specialist workshop.
The engine does not
start. You cannot hear
the starter motor.The on-board voltage is too low because the battery is t oo weak or
discharged.
X Jump-start the vehicle ( Y page 323).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop.
The starter motor was exposed to a thermal load that was t oo high.
X Allow the starter motor to cool down for approximately two
minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop.
Driving155
Driving and parking
Z

transmission automatically shifts up in
order to prevent engine damage.
X To shift down: pull on the left-hand steer-
ing wheel paddle shifter ( Y page 160).
The automatic transmission shifts down to the next gear.
iIf the engine exceeds the maximum
engine speed when shifting down, the auto- matic transmission protects against engine
damage by not shifting down.
iAutomatic down shifting occurs when
coasting.
Shift recommendation
The gearshift recommendations assist you in
adopting an economical driving style. The rec- ommended gear is shown in the multifunction
display.
X Shift to recommended gear ; according
to gearshift recommendation : when
shown in the multifunction display of the
instrument cluster.
Deactivating
If you have activated manual drive program
M , it will remain active for a certain amount of
time. Under certain conditions the minimum
amount of time is extended, e.g. in the case of lateral acceleration, during an overrun phase
or when driving on steep terrain.
If manual drive program M has been deacti-
vated, the automatic transmission shifts into
the automatic drive program that was last
selected, i.e. E or S. You can also deactivate manual drive pro-
gram
M yourself:
X Pull on the right-hand steering wheel pad-
dle shifter and hold it in place ( Y page 160).
or X Use the DIRECT SELECT lever to switch the
transmission position.
or
X Use the program selector button to change
the drive program ( Y page 159).
Manual drive program M is deactivated.
The automatic transmission switches into
the automatic drive program that was last
selected, i.e. E or S.
Automatic transmission161
Driving and parking
Z

If you or others come into contact with fuel,
observe the following:R Wash away fuel from skin immediately
using soap and water.
R If fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance with-
out delay.
R If fuel is swallowed, seek medical assis-
tance without delay. Do not induce vomit-
ing.
R Immediately change out of clothing which
has come into contact with fuel.
GWARNING
Electrostatic buildup can create sparks and
ignite fuel vapors. There is a risk of fire and
explosion.
Always touch the vehicle body before opening
the fuel filler flap or touching the fuel pump
nozzle. Any existing electrostatic buildup is
thereby discharged.
GWARNING
Vehicles with a diesel engine:
If you mix diesel fuel with gasoline, the flash
point is lower than that of pure diesel fuel.
When the engine is running, exhaust system
components could overheat without being
noticed. There is a risk of fire.
Never refuel with gasoline. Never mix gasoline with diesel fuel.
! Do not use diesel to refuel vehicles with a
gasoline engine. Do not switch on the igni-
tion if you accidentally refuel with the
wrong fuel. Otherwise, the fuel will enter
the fuel system. Even small amounts of the wrong fuel could result in damage to the
fuel system and the engine. Notify a quali-
fied specialist workshop and have the fuel
tank and fuel lines drained completely.
! Do not use gasoline to refuel vehicles with
a diesel engine. Do not switch on the igni-
tion if you accidentally refuel with the wrong fuel. Otherwise, the fuel will enter
the fuel system. Even small amounts of the
wrong fuel could result in damage to the
fuel system and the engine. The repair
costs are high. Notify a qualified specialist
workshop and have the fuel tank and fuel
lines drained completely.
! Overfilling the fuel tank could damage the
fuel system.
! Take care not to spill any fuel on painted
surfaces. You could otherwise damage the
paintwork.
! Use a filter when refueling from a fuel can.
Otherwise, the fuel lines and/or injection
system could be blocked by particles from
the fuel can.
Do not get into the vehicle again during the
refueling process. Otherwise, electrostatic
charge could build up again.
If you overfill the fuel tank, fuel could spray
out when the fuel pump nozzle is removed.
For further information on fuel and fuel quality ( Y page 373).
For further information on fuel and fuel qual-
ity, see the separate operating instructions.
Refueling
General information
The fuel filler flap is unlocked or locked auto-
matically when you open or close the vehicle with the SmartKey or with KEYLESS-GO.
The position of the 8 fuel filler cap is dis-
played in the instrument cluster. The arrow
next to the filling pump indicates the side of
the vehicle.
Refueling163
Driving and parking
Z

Opening the fuel filler flap
:To open the fuel filler flap
;To insert the fuel filler cap
=Tire pressure table
?Fuel type to be used
X Switch the engine off.
X Remove the SmartKey from the ignition
lock.
X KEYLESS-GO: open the driver’s door.
This corresponds to SmartKey position 0:
"SmartKey removed".
The driver’s door can be closed again.
X Press the fuel filler flap in the direction of
arrow :.
The fuel filler flap opens slightly.
X Open the fuel filler flap fully.
X Turn the fuel filler cap counterclockwise
and remove it.
X Insert the fuel filler cap into the holder
bracket on the inside of fuel filler flap ;.
X Completely insert the filler neck of the fuel
pump nozzle into the tank, hook in place
and refuel.
X Only fill the tank until the pump nozzle
switches off.
iVehicles with a diesel engine: the filler
neck is designed for refueling at diesel fill-
ing pumps.
iDo not add any more fuel after the pump
stops filling for the first time. Otherwise,
fuel may leak out.
Closing the fuel filler flap
X Replace the cap on the filler neck and turn
clockwise until it engages audibly.
X Close the fuel filler flap.
iClose the fuel filler flap before locking the
vehicle.
iIf you are driving with the fuel filler cap
open, the 8 reserve fuel warning lamp
flashes. A message appears in the multi-
function display ( Y page 248).
In addition, the ; Check Engine warning
lamp may light up ( Y page 267).
For further information on warning and indi- cator lamps in the instrument cluster, see
( Y page 267).
164Refueling
Driving and parking

Parking
Important safety notes
GWARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact withhot parts of the exhaust system or exhaust
gas flow. There is a risk of fire.
Park the vehicle so that no flammable mate-
rials come into contact with parts of the vehi- cle which are hot. Take particular care not to
park on dry grassland or harvested grain
fields.
GWARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect, for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
GWARNING
If you leave children unsupervised in the vehi- cle, they could set it in motion by, for example:
R release the parking brake.
R shift the automatic transmission out of the
parking position P.
R start the engine.
In addition, they may operate vehicle equip-
ment and become trapped. There is a risk of
an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
! Always secure the vehicle correctly
against rolling away. Otherwise, the vehicle
or its drivetrain could be damaged. To ensure that the vehicle is secured against
rolling away unintentionally:
R the parking brake must be applied.
R the transmission must be in position P and
the SmartKey must be removed from the
ignition lock.
R the front wheels must be turned towards
the curb on steep uphill or downhill gradi-
ents.
Switching off the engine
Important safety notes
GWARNING
The automatic transmission switches to neu-
tral position N when you switch off the engine.
The vehicle may roll away. There is a risk of an
accident.
After switching off the engine, always switch
to parking position P. Prevent the parked vehi-
cle from rolling away by applying the parking
brake.
Vehicles with automatic transmission
X Apply the parking brake firmly.
X Shift the transmission to position P.
Using the SmartKey
X Turn the SmartKey to position 0 in the igni-
tion lock and remove it.
The immobilizer is activated.
iThe SmartKey can only be removed if the
transmission is in position P.
Using KEYLESS-GO X Press the Start/Stop button ( Y page 149).
The engine stops and all the indicator
lamps in the instrument cluster go out.
iWhen the driver's door is closed, this cor-
responds to key position 1. When the driv-
er's door is open, this corresponds to key
position 0: "Key removed".
168Parking
Driving and parking

iIn the event of an emergency, the engine
can be turned off while the vehicle is in
motion by pressing and holding the Start/
Stop button for three seconds.
Parking brake
GWARNING
If you must brake the vehicle with the parking brake, the braking distance is considerably
longer and the wheels could lock. There is an
increased danger of skidding and accidents.
Only use the parking brake to brake the vehi-
cle when the service brake is faulty. Do not
apply the parking brake too firmly. If the
wheels lock, release the parking brake until
the wheels begin turning again.
GWARNING
If you leave children unsupervised in the vehi- cle, they could set it in motion by, for example:
R release the parking brake.
R shift the automatic transmission out of the
parking position P.
R start the engine.
In addition, they may operate vehicle equip-
ment and become trapped. There is a risk of
an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
If you brake the vehicle with the parking
brake, the brake lamps will not light up.
X To apply: depress parking brake ; firmly.
When the engine is running, the $ (USA
only) or J (Canada only) indicator lamp
lights up in the instrument cluster.
X To release: depress the brake pedal and
keep it depressed.
X Pull release handle :.
When the ignition is switched on or the
engine is running, the $ (USA only) or
J (Canada only) indicator lamp goes out
in the instrument cluster.
Parking the vehicle for a long period
If you leave the vehicle parked for longer than
four weeks, the battery may be damaged by
exhaustive discharging.
If you leave the vehicle parked for longer than six weeks, the vehicle may suffer damage as a
result of lack of use. X Visit a qualified specialist workshop and
seek advice.
iYou can obtain information about trickle
chargers from a qualified specialist work-
shop.
Driving tips
General driving tips
Important safety notes
GWARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect, for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving.
GWARNING
If you operate mobile communication equip-
ment while driving, you will be distracted from
Driving tips169
Driving and parking
Z