
Interrupt control (sprung position) Activate ACC (control deactivated)BTake control againa)
/ Increase speedCLaunch control / reduce speeda)
If no speed stored, the current speed is adopted.
After starting the system, the current speed is stored and the instrument clus-
ter illuminates the warning light
.
After the interruption in control, the stored speed can be resumed by pressing
the
B
button.
Automatic control interruption
Automatic control interruption occurs if any of the following conditions are
met.
› By pressing the brake or clutch pedal.
› When one of the brake assist systems (e.g. ESC) intervenes.
› Through an airbag deployment.
WARNING■
Always deactivate the cruise control system after use to prevent the sys-
tem being switched on unintentionally.■
Control may only be resumed if the stored speed is not too high for the
current traffic conditions.
Note
During control, speed can be increased by pressing the accelerator pedal. Re-
leasing the accelerator pedal will cause the speed to drop again to the set
speed.
START-STOP
Introduction
This chapter contains information on the following subjects:
Operating conditions of the system
88
Operation in vehicles with manual gearboxes
89
Operation in vehicles with automatic gearboxes
89
System related automatic start-up
89
Manually deactivating/activating the system
90The START-STOP system (hereinafter referred to as the system) saves fuel and
reduces polluting emissions and CO 2 emissions by turning the engine off, e.g.
when stopping at traffic lights, and starting the engine again when moving off.WARNING■ Never let the vehicle roll with the engine switched off.■The brake servo unit and power steering only operate if the engine is run-
ning.
Operating conditions of the system
Fig. 87
Above: Engine is automatically
switched off / down: automatic
cut off is not possible
Read and observe on page 88 first.
For system-dependent automatic engine shutdown
to work, the following conditions must be met.
The driver's door is closed.
The driver has fastened the seat belt.
The bonnet is closed.
The driving speed was higher than 4 km/h after the last stop.
Some additional conditions for the system to function correctly cannot be in-
fluenced or recognised by the driver. Therefore, the system can react differ-
ently in situations which are identical from the driver's perspective.
If, after stopping the vehicle, the check icon
» Fig. 87 appears on the display,
then the conditions for automatic engine shutdown are not met.
Running the engine is essential for the following reasons, for example.
› The engine temperature for the proper function of the system has not yet
been reached.
› The charge state of the vehicle battery is too low.
88Driving

›The current consumption is too high.
› High air-conditioning or heating capacity (high fan speed, big difference be-
tween the desired and actual interior temperature).
Note
■ If the vehicle remains outdoors for a long time in minus temperatures or in
direct sunlight, it can take several hours until the internal temperature of the
vehicle battery reaches a suitable temperature for proper operation of the
START STOP system.■
If the driver's seat belt is removed for more than approx. 30 seconds or the
driver's door is opened during stop mode, the engine will have to be started
manually.
■
After the manual engine start and with a manual gearbox the automatic en-
gine shutdown can take place only when a minimum distance required for the
system function has been covered.
Operation in vehicles with manual gearboxes
Read and observe
on page 88 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Stop the vehicle.
›
Put the gear stick into Neutral.
›
Release the clutch pedal.
Automatic engine shutdown then occurs and the indicator symbol appears in
the display
» Fig. 87 on page 88 .
Automatic engine start
›
Depress the clutch pedal.
The automatic re-start process takes place and the indicator symbol goes
out.
Operation in vehicles with automatic gearboxes
Read and observe
on page 88 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown›Bring the vehicle to a stop and depress the brake pedal.
Automatic engine shutdown then occurs and the indicator symbol appears in
the display
» Fig. 87 on page 88 .
Automatic engine start›
Release the brake pedal.
The automatic re-start process takes place and the indicator symbol
goes
out.
For more information about automated manual transmission
The automatic engine shut down takes place when the selector lever is in po-
sitions D, N , and in Tiptronic mode.
If the engine is off due to the automatic and the selector lever is put to the R
position then the automatic starts the engine.
If the gear selector is moved from position R to the position D or N the vehicle
must reach a speed of more than 10 km/h before the automatic engine shut-
down starts.
There is no automatic engine shutdown when the system detects a vehicle
moving due to a large steering angle.
No automatic engine shutdown takes place when the vehicle is moving at low
speed (e.g. during a traffic jam or when tuning) and remains stationary after
pressing the brake pedal lightly. Automatic engine shutdown takes place if you
press the brake pedal down with more force.
System related automatic start-up
Read and observe
on page 88 first.
When the engine is off, the system can automatically start the engine before
the desired journey continues. Some possible reasons for this are:
› The vehicle begins to roll, e.g. on a slope.
› The brake pedal has been actuated several times.
› The current consumption is too high.
89Assist systems

WARNING (Continued)■If the laser sensor is damaged or faulty.■When the vehicle is on a rolling test bench.■
When the windscreen is damaged in the region of the laser sensor.
■
For example, if the charge extends to the roof rack over the front edge of
the roof.
Tyre pressure monitoring
Introduction
This chapter contains information on the following subjects:
Save tyre pressure values
92
The tyre pressure monitoring function (hereinafter referred to only as a sys-
tem) monitors the tyre pressure while driving.
If the rolling circumference of a wheel is changed, the warning light in the
instrument cluster illuminates and an audible signal sounds.
Information on the procedure for the notification of change of tyre inflation
pressure » page 37 .
The system can only function properly if the tyres have the prescribed inflation
pressure and these pressure values are stored in the system.
WARNING■ Having the correct tyre inflation pressure is always the driver's responsi-
bility. Tyre pressure should be checked regularly » page 118.■
The system cannot warn in case of very rapid tyre inflation pressure loss,
e.g. in case of sudden tyre damage.
Save tyre pressure valuesFig. 91
Key for storing the pressure val-
ues
Read and observe on page 92 first.
Save the tyre pressure values as follows.
›
Inflate all the tyres to the specified pressure.
›
Switch on the ignition.
›
Press the symbol key
» Fig. 91 and hold down.
The warning light in the instrument cluster illuminates.
An acoustic signal and the control indicator provide information about the
storage of the tyre pressure values.
›
Release the symbol key .
Always save the tyre pressure values in the system if one of the following
events occurs.
› Change of tyre inflation pressure.
› Change one or more wheels.
› Change in position of a wheel on the vehicle.
› Illumination of the warning light
in the instrument cluster.
WARNINGBefore storing the pressures, the tyres must be inflated to the specified in-
flation pressure » page 118. If the wrong pressure valuesare stored, the
system may not issue any warnings, even if the tyre pressure is too low.
CAUTION
Save the tyre pressure values every 10,000 km or 1x annually to ensure correct
system functioning.92Driving

■Electrically heated seats must not be dried after cleaning by switching on the
heater.■
Do not sit on wet seats - risk of seat deformation.
■
Always clean the seats “from seam to seam”.
Safety belts
Read and observe
and on page 101 first.
Wash dirty seat belts with mild soapy water.
Remove coarse dirt with a soft brush.
WARNING■ The seat belts must not be removed for cleaning.■Never clean the seat belts chemically as chemical cleaning products could
destroy the fabric.■
The seat belts must not be allowed to come into contact with corrosive
liquids (e.g. acids).
■
The seat belts must be fully dried before being rolled up.
Inspecting and replenishing
Fuel
Introduction
This chapter contains information on the following subjects:
Petrol Refuelling
104
Lead-free petrol
104
Refuelling CNG (compressed natural gas)
105
CNG
106
The correct fuel grades for your vehicle are specified on the inside of the fuel
filler flap » Fig. 92 on page 104 .
WARNING■
Observe the local regulations regarding fuel handling.■The operating instructions of the refuelling system must always be fol-
lowed.■
Do not smoke when refuelling and do not use a mobile phone.
■
Fuel vapours are explosive - can be fatal!
CAUTION
■ Never drive until the fuel tank is completely empty! The irregular supply of
fuel can cause misfiring, which can result in damage to parts of the engine and
the exhaust system.■
Immediately remove any fuel that has spilled onto the vehicle's paintwork –
risk of paint damage!
■
If the vehicle was not purchased in the country where it was intended to be
operated, you should check whether the fuel specified by the manufacturer is
offered in the country where the vehicle will be operated. You should also per-
haps check whether the manufacturer has recommended a different fuel for
operation of the vehicle in the corresponding country. If no prescribed fuel is
available, then you must check whether it is permitted by the manufacturer to
operate the vehicle with another fuel type.
103Inspecting and replenishing

Petrol RefuellingFig. 92
Fuel filler
Read and observe and on page 103 first.
Refuelling can be done if the following conditions are met.The vehicle is unlocked.
The engine and the ignition are switched off.
›
Open the fuel filler flap.
›
Hold the fuel tank cap firmly and unlock with the key counter-clockwise.
›
Unscrew the filler cap by turning it in a counter-clockwise direction and place
the cap onto the top of the fuel filler flap » Fig. 92.
›
Insert the pump nozzle into the fuel filler tube as far as it will go.
The fuel tank is full just as soon as the pump nozzle switches off for the first
time »
.
›
Remove the pump nozzle from the fuel filler tube and put it back in the
pump.
›
Turn the filler cap to the right until it audibly clicks into place.
›
Hold the fuel cap hold firmly, lock with the key clockwise and remove the
key.
›
Close the filler cap.
WARNINGInstructions for filling the reserve canister■Never fill the reserve can inside the vehicle.■
Never place the reserve can on the vehicle.
■
Always place the reserve can on the floor.
WARNING (Continued)■ The national legal requirements must be observed if carrying a spare can-
ister in the vehicle.■
We do not recommend carrying any fuel canisters in your vehicle for safe-
ty reasons. in the event of an accident, these canisters can become dam-
aged and fuel may escape – risk of fire!
CAUTION
■ The fuel tank is full just as soon as the pump nozzle switches off for the first
time, provided the nozzle has been operated properly. Not continue refuelling.■
Be careful when filling diesel fuel from the spare canister and then do this
slowly and cautiously – danger of contaminating the body.
Note
The fuel tank has a capacity of about 35 litres, including a reserve of approx.
4 litres .
Lead-free petrol
Read and observe
and on page 103 first.
The vehicle can only be operated with unleaded petrol that meets the EN 2281)
standard.
All petrol engines can be operated using petrol that contains at most 10% bio-
ethanol (E10).
Prescribed fuel – unleaded petrol min. 95 RON
Use unleaded fuel with the octane rating 95 RON or higher.
If unleaded gasoline is not available with the octane number 95 RON, in an
emergency petrol with the octane rating of 91, 92 and 93 RON can be used to
fill the tank, but this leads to a slight loss of performance and a slightly in-
creased fuel consumption »
.
Fuel additives
Unleaded petrol in accordance with the EN 228 standard 1)
meets all the condi-
tions for a smooth-running engine. We therefore recommend that no fuel ad-
ditives are used. This can result in considerable damage to parts of the engine
or the exhaust system.
1)
In Germany, DIN 51626-1 or E10 for unleaded gasoline with octane number 95 and 91.
104General Maintenance

CAUTION■Even filling the tank with petrol that does not meet the standards once can
lead to serious damage to parts of the exhaust system!■
If a fuel other than unleaded fuel which complies to the above mentioned
standards (e.g. leaded petrol) is used by mistake, do not start the engine or
switch on the ignition! Extensive damage to engine parts can occur!
CAUTION
■ If, in an emergency, the vehicle has to be refuelled with petrol of a lower oc-
tane number than the one prescribed, the journey must only be continued at
medium engine speeds and a low engine load. Driving at high engine revs or a
high engine load can severely damage the engine! Refuel using petrol of the
prescribed octane number as soon as possible.■
Engine parts can be damaged if petrol with a lower octane number than the
one prescribed is used.
■
Even in the event of an emergency, petrol of a lower octane number than 91
RON must not be used, otherwise the engine can be severely damaged!
CAUTION
In no case may fuel additives with metal components be used, especially not
with manganese and iron content. Risk of causing considerable damage to
parts of the engine or exhaust system!
CAUTION
Fuels with metal components, such as LRP (lead replacement petrol) must
not be used. Risk of causing considerable damage to parts of the engine or
exhaust system!
Note
■ Unleaded petrol that has a higher octane number than that required by the
engine can be used without limitations.■
On vehicles using prescribed unleaded petrol of min. 95 RON, the use of pet-
rol with a higher octane number than 95 RON can increase the power and re-
duce fuel consumption.
Refuelling CNG (compressed natural gas)Fig. 93
Natural gas filler tubes
Read and observe and on page 103 first.
Natural gas refuelling can be done if the following conditions are met.
The vehicle is unlocked.
The engine and the ignition are switched off.
The gas filler tube for refuelling with natural gas is located behind the fuel fill-
er flap next to the petrol filler tube.
The filling couplings of the natural gas refuelling systems may differ in han-
dling. When refuelling with natural gas at unfamiliar refuelling systems, you
should seek help from trained fuel station staff. If unsure, have the refuelling
done by trained fuel station staff.
Open fuel filler flap
›
Open the fuel filler flap.
›
Remove the cap
A
» Fig. 93 from the gas filler tube
B
.
›
Plug the filling coupling of the refuelling system on the gas filler tube
B
.
The fuel tank is full when the compressor of the refuelling system automati-
cally switches off. To stop the refuelling operation prematurely, press the
“Stop ” button of the refuelling system.
Closing the filler cap
›
Check that the sealing ring
C
» Fig. 93 has remained inserted in the gas filler
tube.
If the sealing ring
C
has slipped onto the filling coupling, reinsert it into the
gas filler tube.
›
Plug the cap
A
onto the gas filler tube.
›
Close the bonnet.
105Inspecting and replenishing

Automatically switching over from natural gas mode to petrol mode
The vehicle automatically switches from natural gas to petrol, for example, if one of the following cases occurs.
› With an empty gas tank or not enough pressure in the tank.
› After refuelling with natural gas.
› At very low surrounding temperatures.
Gas smell
If you smell gas proceed as follows.
› Stop the vehicle.
› Put out cigarettes.
› Switch off the ignition.
› Open doors and the boot lid to ventilate the vehicle sufficiently.
› Remove any spark producing or incendiary items from the car and immedi-
ately switch off.
› Do not continue if the odour persists.
Seek help from a specialist garage to correct the gas system fault.
Regular gas system checks must be carried out in a specialist workshop on
natural gas-powered vehicles.WARNINGWhen operating a CNG-powered vehicle, the national legal requirements
must be observed.WARNINGDo not underestimate the smell of gas in the car or when refuelling - it may
result in fire, explosion and injury.
Engine compartment
Introduction
This chapter contains information on the following subjects:
Opening and closing the bonnet
108
Engine compartment overview
109
Radiator fan
109
Windscreen washer system
109WARNINGInjuries or scolding or risks of accident or fire may occur when working in
the engine compartment. For this reason, it is essential to comply with the
warning instructions outlined below and with the general applicable safety
rules. The engine compartment of your car is a hazardous area!WARNINGInstructions before beginning work in the engine compartment■Turn off the engine and withdraw the ignition key.■
Firmly apply the handbrake.
■
For vehicles with manual transmission the lever into the neutral position.
■
For vehicles with automated manual transmission, shift the lever to posi-
tion N.
■
Allow the engine to cool.
■
Never open the bonnet if you can see steam or coolant escaping from the
engine compartment – risk of scalding! Wait until no more steam or coolant
is escaping.
WARNINGInformation for working in the engine compartment■Keep all people, especially children, away from the engine compartment.■
Never touch the radiator fan while the engine is still warm. The fan might
suddenly start running!
■
Do not touch any hot engine parts – risk of burns!
WARNINGInformation for working in the engine compartment with the engine run-
ning■
Pay particular attention to moving engine parts, e.g. V-ribbed belt, gener-
ator, radiator fan - danger to life!
■
Never touch the electric wiring on the ignition system.
■
Avoid short circuits in the electrical system – particularly on the vehicle's
battery.
■
Always make sure that no jewellery, loose clothing or long hair can get
caught in rotating engine parts – risk to life! Always remove any jewellery,
tie back long hair and wear tight fitting clothing before completing any
work.
107Inspecting and replenishing

The oil can be checked and topped up, if the following conditions are satisfied.The vehicle is standing on a horizontal surface.
The engine operating temperature is reached.
The engine is turned off.
The bonnet is open.
Checking the level›
Wait a few minutes until the engine oil flows back into the oil trough.
›
Pull out the dipstick.
›
Wipe the dipstick with a clean cloth and insert it again to the stop.
›
Pull the dipstick out again and check the oil level.
›
Re-insert the dipstick.
The engine consumes a little oil. The oil consumption may be as much as 0.5 l/
1 000 km depending on your style of driving and the conditions under which
you operate your vehicle. Consumption may be slightly higher than this during
the first 5 000 km.
The oil level must be checked at regular intervals.
In case of the oil level being too low, the display of the instrument cluster
shows the control symbol
» page 35 . Check the oil level using the dipstick as
soon as possible. Add oil accordingly.
CAUTION
■ The oil level must never be above the A range » Fig. 100 – there is a risk of
damaging the exhaust system!■
Stop driving if for some reason it is not possible to top up the engine oil
under the current conditions. Switch off the engine and seek assistance from a
specialist garage.
■
If the oil level is above the range
A
,
stop driving! Switch off the engine
and seek assistance from a specialist garage.
Replenishing
Read and observe
and on page 110 first.
›
Unscrew the cap of the engine oil filler opening » Fig. 98 on page 109 .
›
Replenish the oil in portions of 0.5 litres in accordance with the correct speci-
fications » page 110 .
›
Check the oil level » page 110.
›
Screw the lid of the engine oil filler closed carefully.
›
Pull the dipstick out as far as the stop.
Coolant
Introduction
This chapter contains information on the following subjects:
Checking the coolant level
112
Replenishing
112
The coolant provides cooling for the motor.
It consists of water and coolant additive with additives that protect the cooling
system against corrosion and prevents furring.
The coolant additive level in the coolant must be at least 40%.
The coolant additive may be increased to a maximum of 60%.
The correct mixing ratio of water and coolant additive is to be checked if nec- essary by a specialist garage or is to be restored if necessary.
The description of the coolant is shown in the coolant expansion reser-
voir » Fig. 101 on page 112 .
WARNINGThe engine compartment of your car is a hazardous area. The following
warning instructions must be followed at all times when working in the en-
gine compartment » page 107.■
The coolant is harmful to health.
■
Avoid contact with the coolant.
■
Coolant vapours are harmful to health.
■
Never open the end cover of the coolant expansion reservoir while the
engine is still warm. The cooling system is pressurized!
■
When opening the end cover of the coolant expansion reservoir, cover it
with a cloth to protect your face, hands and arms from hot steam or hot
coolant.
■
If any coolant splashes into your eyes, immediately rinse out your eyes
with clear water and contact a doctor as soon as possible.
■
Always keep the coolant in the original container, safe from people who
are not completely independent, especially children - there is a danger of
poisoning!
■
If coolant is swallowed, consult a doctor immediately.
■
Never spill operating fluids over the hot engine - risk of fire.
111Inspecting and replenishing