
Other incidents
The illumination of the warning light can have the following reasons.
▶ The vehicle is loaded on one side. Distribute loads as evenly as possible.
▶ The wheels of one axle are loaded more heavily (e.g. when towing a trailer or
when driving uphill or downhill).
▶ Snow chains are mounted.
▶ A wheel has been changed.
CAUTION
Under certain circumstances (e.g. sporty style of driving, wintry or unpaved
roads) the warning light in the instrument cluster can be delayed or does
not light up at all.
Brake linings
Read and observe
on page 32 first.
illuminates - the brake pads are worn.
Check brake pad!BRAKE PADS PLEASE CHECK
Seek help from a specialist garage.
Fuel reserve
Read and observe
on page 32 first.
illuminates – the fuel level in the fuel tank is at the reserve level (approxi-
mately 6 litres).
Please refuel. Range: ...
kmPLEASE REFUEL RANGE …
km
An audible signal sounds as a warning.
Note
The text in the display goes out after refuelling and driving a short distance.
Lane following system (Lane Assist)
Read and observe
on page 32 first.
The warning lights
indicates the state of the Lane Assist system.
More information about the Lane Assist System » page 160.
Turn signal system
Read and observe
on page 32 first.
flashes – the left turn signal is turned on.
flashes – the right turn signal is turned on.
If there is a fault in the turn signal system, the warning light flashes at twice
its normal rate. This does not apply when towing a trailer.
Switching off the hazard warning light system is switched on will cause all of
the turn signal lights as well as both warning lights to flash.
Trailer turn signal lights
Read and observe
on page 32 first.
flashes – the trailer lights are switched on.
If a trailer is hitched and the warning light is not flashing, one of the trailer
turn signal lights has failed.
An example message in the display of the instrument cluster
Trailer: check left turn signal!TRAILER TURN SIG_ CHECK LEFT
Check the trailer bulbs.
Fog lights
Read and observe
on page 32 first.
illuminates – the fog lights are switched on.
Cruise control system
Read and observe
on page 32 first.
illuminates - the vehicle speed is limited by the speed regulator system
and/or the automatic distance control.
36Using the system

Current driving speed
The display is identical to the display on the speedometer.
Average speed
The indication is calculated continuously since the last deletion of the memory.
After erasing the memory, no data will appear for the first 300 m driven.
Distance travelled
The distance travelled since the memory was last erased is displayed.
The maximum distance indicated is 9999 km. The indicator is automatically set
back to zero if this period is exceeded.
Driving time
The time travelled since the memory was last erased is displayed.
The maximum distance indicated is 99 hours and 59 minutes. The indicator is
automatically set back to zero if this period is exceeded.
Convenience consumers
There, the total consumption of all consumer comfort in l / h is displayed.
Along with the consumption data, a list of the three consumers with the larg-
est share of fuel consumption (e.g. air conditioning and similar devices) is dis-
played.
Refuelling amount 1)
After the consumption of about 10 litres of fuel from the fully refuelled tank, an amount of fuel is displayed in l. This amount can now be safely refilled.
Natural gas quality
The details of the quality of natural gas are displayed as a percentage of be-
tween 70% to 100%.
The higher the value of natural gas, the lower is the consumption.
Coolant temperature
If the coolant temperature is in the range 80-110 °C, the engine operating tem-
perature is reached.
If the temperature lies below 80 °C or above 110 °C, avoid high engine revs, full
throttle and high engine loads.Warning when exceeding the set speed
Read and observe
on page 41 first.
The system offers the possibility to set a speed limit beyond which an audible
alarm will sound and the following warning message appears.
Speed ... exceeded.SPEED TOO HIGH
Adjust the speed limit while the vehicle is stationary
›
Select the menu item
Warning at
at (
) or
(
) and confirm.
›
Set the desired speed limit.
›
Confirm the set value, or wait several seconds; your settings will be saved
automatically.
The speed limit can be set in 5 km/h intervals.
Adjusting the speed limit while the vehicle is moving
›
Select the menu item
Warning at
at ( ) or
(
) and confirm.
›
Drive at the desired speed.
›
Confirm the current speed as the speed limit.
The set speed limit can be manually adjusted later if needed.
Deactivate speed limit
›
Select the menu item
Warning at
at ( ) or
(
) and confirm.
›
Confirm the stored value of the speed limits.
The speed limit will be disabled.
The speed limit set mode is stored even after the ignition is switched off and
on. After a gap between driving exceeding 2 hours, the pre-set speed limit is
deactivated.
1)
Only valid for some countries.
43Information system

MemoryFig. 31
Memory display: MAXI DOT dis-
play (
)/segment display (
)
Read and observe on page 41 first.
Following driving data is stored in three locations.
▶ Average fuel consumption.
▶ Distance driven.
▶ Average speed.
▶ Driving time.
Display of the selected memory in the display at position
A
» Fig. 31 .
Since start
(
) Or “1” (
)
The memory collates the driving information from the moment the ignition is
switched on until it is switched off.
New data will also flow into the calculation of the current driving information if
the trip is continued within 2 hours after switching off the ignition.
If the trip is interrupted for more than 2 hours, the memory is automatically
erased.
Long-term
( ) And “2” (
)
The memory gathers driving information from any number of individual jour-
neys up to a total of 99 hours and 59 minutes driving or 9999 kilometres driv-
en.
The indicator is automatically set back to zero if one of the indicated values is
exceeded.
Since refuel
( ) or “3” (
)
The memory gathers driving information since the last refuelling.
The memory is erased automatically the next time you fill up.
Select memory
▶ Select the driving data information desired.
▶ Confirm details again to select the desired memory.
Resetting ▶ Select the driving data information desired.
▶ Select the desired memory.
▶ Reset the selected memory with a long acknowledgement (holding pressed).
Note
Disconnecting the vehicle battery will delete all memory data.
MAXI DOT display
Introduction
This chapter contains information on the following subjects:
Main menu
45
Operation using the operating lever
45
Operation using the multifunction steering wheel
46
Menu item
Navigation46
Menu item
Audio47
Menu item
Telephone47
Menu item
Assist systems48
Menu item
Lap timer
(Stop watch)
48
Compass point display
49
Eco-tips
49
The MAXI DOT display (hereinafter referred to as display) is a user interface
which, depending on the equipment configuration, delivers information about
the Infotainment, the multifunction display, the assistance systems, etc.
WARNINGConcentrate fully at all times on your driving! As the driver, you are fully re-
sponsible for the operation of your vehicle.44Using the system

Opening›Turn regulator B » Fig. 138 or » Fig. 139 upwards.
Closing›
Turn regulator
B
» Fig. 138 or » Fig. 139 downwards.
Depending on the setting of the air distribution on the front panel of the heat-
er, the manual air conditioning or the Climatronic, the following air vents are
active.
Set the direction of the air outletActive air outlet nozzles » Fig. 138 and
» Fig. 139 1. 2 . 41. 2 . 4 . 5 . 7 3. 4 . 64 . 5 . 73 . 4 . 5 . 6 . 7
CAUTION
To ensure that the heating, the manual air conditioning and the Climatronic
systems work properly, do not block up the air outlet vents with any objects.
Auxiliary heating (auxiliary heating and ventilation)
Introduction
This chapter contains information on the following subjects:
Switching on/off
118
Radio remote control
119
Functional requirements of the auxiliary heating (auxiliary heating and ventila-
tion)
The charge state of the vehicle battery is sufficient.
The fuel supply is adequate (the warning light is not illuminated in the
instrument cluster).
Aux. heating
The auxiliary heating can be used when both when stationary, when the en-
gine is switched off, to preheat the vehicle and also while driving (e.g. during
the heating phase of the engine).
The auxiliary heating warms up the coolant by combusting fuel from the vehi-
cle tank. This heats the air flowing into the passenger compartment (if the
blower is turned on).
The auxiliary heating also warms up the engine.
Auxiliary ventilation
The auxiliary ventilation enables fresh air to flow into the vehicle interior by
switching off the engine, whereby the interior temperature is effectively de-
creased (e.g. with the vehicle parked in the sun).WARNING■ The auxiliary heating (auxiliary heating and ventilation) (hereinafter refer-
red to as aux. heating) must never be operated in closed rooms (e.g. garag-
es) – risk of poisoning!■
The auxiliary heating must not be allowed to run during refuelling – risk
of fire.
■
The exhaust pipe of the auxiliary heating is located on the underside of
the vehicle. If you want to use the heater, do not park the car in places
where the exhaust fumes can come into contact with flammable materials
such as dry grass, undergrowth, leaves, spilled fuel etc. - risk of fire.
CAUTION
■ The exhaust pipe of the auxiliary heating, which is located on the underside
of the vehicle, must not be clogged and the exhaust flow must not be blocked.■
If the auxiliary heating is running, the vehicle battery discharges.
■
The air inlet in front of the windscreen must be free (e.g. of ice, snow or
leaves) to ensure that the auxiliary heating operates properly.
117Heating and ventilation

Inspecting and replenishing
Fuel
Introduction
This chapter contains information on the following subjects:
Petrol and diesel refuelling
189
Lead-free petrol
190
Diesel fuel
191
Refuelling with CNG (compressed natural gas)
192
CNG
193
The correct fuels for your vehicle are specified on the inside of the fuel filler
flap » Fig. 199 on page 189 .
WARNING■
The operating instructions of the refuelling system must always be fol-
lowed.■
Do not smoke when refuelling and do not use a mobile phone.
■
The fuel and fuel vapours are explosive - risk to life!
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.
Petrol and diesel refuellingFig. 199
Open fuel filler flap/unscrew tank cap/place the tank cap on the
fuel filler flap
Fig. 200
Fuel filler tube on vehicles with
diesel engines
Read and observe and on page 189 first.
Refuelling can be done if the following conditions are met.
The vehicle is unlocked.
The engine and the ignition are switched off.
The auxiliary heating and ventilation is switched off » page 118.
›
Press on the fuel filler flap in the direction of arrow
1
» Fig. 199.
›
Open the flap in the direction of arrow
2
.
›
Unscrew the tank cap in the direction of arrow
3
.
›
Remove the tank cap and place in the recess on top of the fuel filler flap in
the direction of arrow
4
.
›
Insert the pump nozzle into the fuel filler neck as far as it will go, and refuel.
The fuel tank is full just as soon as the pump nozzle switches off for the first
time »
.
189Inspecting and replenishing

›Remove the pump nozzle from the fuel filler tube and put it back in the
pump.›
Place the filler cap onto the fuel filler neck and turn it in the opposite direc-
tion to arrow
3
until it securely engages.
›
Close the fuel filler flap until it clicks into place.
Check that the fuel filler flap is closed properly.
Incorrect refuelling guard on vehicles with diesel engines
The fuel filler tube on vehicles with diesel engines has been fitted with a in-
correct refuelling guard » Fig. 200. This guard means it is only possible to re-
fuel with the diesel pump nozzle.
If the diesel pump nozzle does not sit directly in the fuel filler tube, move it to
and fro with slight pressure to insert it correctly.
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.
■
We do not recommend carrying any fuel canisters in your vehicle for safe-
ty reasons. in the event of an accident this can get damaged 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.
■
The diameter of the diesel pump nozzle can be identical to that of the petrol
pump nozzle in some countries. When driving in these countries, the incorrect
fuelling protection should be removed by a specialist company.
Note
The fuel tank has a capacity of about 50 litres, including a reserve of approx.
6 litres .Lead-free petrol
The correct fuel grades for your vehicle are specified on the inside of the fuel
filler flap.
Read and observe
and on page 189 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).
Unleaded petrol 95/91 or 92 or 93 RON/ROZ
We recommend using unleaded fuel with an octane rating of 95 RON. Unlea-
ded petrol with the octane ratings 91, 92 or 93 RON can also be used, but may
result in a slight loss in performance and slightly increased fuel consumption.
Unleaded petrol min. 95 RON / ROZ
Use unleaded fuel with the octane rating 95 RON or higher.
In an emergency petrol with the octane ratings 91, 92 and/or 93 RON can also
be used, but may result in a slight loss in performance and slightly increased
fuel consumption. Continue driving at medium engine speeds and minimum
engine load »
.
Refuel using petrol of the prescribed octane number as soon as possible.
Unleaded petrol 98/(95) RON / ROZ
We recommend using unleaded fuel with an octane rating of 98 RON or higher.
Unleaded petrol 95 RON can also be used but this results in a slight loss in per-
formance and slightly increased fuel consumption.
In an emergency petrol with the octane ratings 91, 92 and/or 93 RON can also
be used, but may result in a slight loss in performance and slightly increased
fuel consumption. Continue driving at medium engine speeds and minimum
engine load »
.
Refuel using petrol of the prescribed octane number as soon as possible.
1)
In Germany also DIN 51626-1 or E10 for unleaded petrol with octane number 91 or 95 or DIN 51626-2 or E5
for unleaded petrol with octane number 95 and 98.
190General Maintenance

Preheating fuel
The vehicle is fitted with a fuel filter preheating system. This secures opera-
tion of a vehicle using diesel fuel down to an environmental temperature of
-24 °C.
Diesel fuel additives
The diesel fuel in accordance with the prescribed standards meets all the con-
ditions for a smooth running engine. We therefore recommend that no diesel
fuel additives are used. This can result in considerable damage to parts of the
engine or the exhaust system.
CAUTION
■ Just filling the tank once with diesel fuel that does not comply with the
standard, can cause severe damage to parts of the engine, the fuel and ex-
haust system.■
If a different fuel other than diesel fuel, which complies to the above men-
tioned standards (e.g. petrol) is used, do not start the engine or switch on the
ignition! Extensive damage to engine parts can occur.
■
Water which has collected in the fuel filter can cause engine faults.
CAUTION
■ The vehicle cannot be operated with bio fuel RME, therefore this fuel must
not be filled in the tank and used for driving the vehicle. The use of biofuel
RME can cause considerable damage to parts of the engine or fuel system.■
Do not mix any fuel additives, so-called “flow improvers” (petrol and similar
agents) into the diesel. This can result in considerable damage to parts of the
engine or the exhaust system.
Refuelling with CNG (compressed natural gas)
Fig. 201
Natural gas filler tubes
Read and observe and on page 189 first.
Natural gas refuelling can be carried out if the following conditions are met.
The vehicle is unlocked.
The engine and the ignition are switched off.
The auxiliary heating and ventilation is switched off » page 118.
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 cap
A
» Fig. 201 from gas filler tube
B
in direction of the arrow.
›
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 sealing ring
C
» Fig. 201 has remained inserted in the gas filler
tube.
If 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.
The natural gas refuelling systems have an overfill protection relating to the
outdoor temperature. At very high outside temperatures, it may happen that
the gas tank may not be fully refuelled.
The natural gas system of your vehicle is suitable both for “slow fuelling” (fuel-
ling from small compressors) and for “quick fuelling” (fuelling from natural gas
stations with large compressors).
If the vehicle is parked for a longer period of time immediately after refuelling,
the situation may arise in which the pointer of the fuel tank gauge does not
indicate exactly the same level as was the case immediately after refuelling
192General Maintenance

when the engine is restarted. This is not due to any system leakages but a
drop in pressure in the natural gas fuel tank due to technical reasons after a
cooling phase directly after refuelling.
The maximum lifetime of the gas tank is 20 years.
The capacity of the natural gas fuel tank is approximately 15 kg.
The capacity of the gasoline fuel tank is about 50 litres, of which about 6
lighters are in reserve.WARNING■
When refuelling, never get into the vehicle. If you have to get into your
vehicle in exceptional cases, touch a metal surface before you touch the
filling coupling again. This will avoid electrostatic discharges, which may
generate sparks. Sparks can cause a fire during refuelling.■
Natural gas is highly explosive and highly flammable.
Note
During the filling process sounds are heard which are harmless. If you are un-
sure which service station staff to use, ask the petrol station staff.
CNG
Fig. 202
Position of the CNG label(s).
Read and observe
and on page 189 first.
A G-TEC-vehicle may be operated with CNG and petrol.
In some countries, national legislation requires that vehicles with CNG opera-
tion be identified by one of the labels » Fig. 202.
Position of the CNG label » Fig. 202.
Natural gas quality and consumption
Depending on the natural gas supplier, the natural gas quality (heating value) may vary. The engine system adjusts automatically to the natural gas quality.
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.
Use all the petrol in the fuel tank at lease once every six months until the
warning light
illuminates and then refill with petrol. This is to ensure that
the fuel system functions correctly and to preserve the quality of the fuel.
Gas leak
If a gas leak is suspected (noticeable odour), proceed as follows. ▶ Stop the vehicle.
▶ Switch off the ignition.
▶ Put out any cigarettes, remove any spark-producing or incendiary items from
the vehicle and immediately switch the engine off.
▶ Open the doors and the boot lid to ventilate the vehicle sufficiently.
▶ Do not continue to drive if the odour persists.
▶ If it is not possible to leave an enclosed area with a vehicle with a gas leak
(e.g. in a tunnel, underpass, garage, ferry, etc.), call the emergency services
immediately.
Seek help from a specialist garage to correct the gas system fault.
In a traffic accident
If a gas leak is suspected in a traffic accident, proceed as follows.
▶ Switch off the ignition.
▶ Put out any cigarettes, remove any spark-producing or incendiary items from
the vehicle and immediately switch the engine off.
▶ Have all the occupants get out.
▶ Prevent people walking past/standing in the immediate vicinity of the acci-
dent vehicle. We recommend standing at least 10 metres from the vehicle.
▶ Inform the emergency services that it is a natural gas vehicle.
Regular gas system checks
Regular gas system checks must be carried out in a specialist workshop on
natural gas-powered vehicles. The vehicle owner is responsible for ensuring
tests are conducted properly. 193Inspecting and replenishing