When pulling away again, the engine starts
automatically. The ECO start/stop function
thereby helps you to reduce the fuel con-
sumption and emissions of your vehicle.
The stop/start function is automatically acti-
vated each time you start the engine with the
ignition key.
If the ECO start/stop function has been man-
ually deactivated or a malfunction has caused
the system to be deactivated, 00A7sym-
bol 0044is not displayed. In addition, the indi-
cator lamp in the ECO button on the center
console does not light up.
Automatic engine switch-off The ECO start/stop function is operational
and the 00A7symbol is displayed in the mul-
tifunction display, if:
R the indicator lamp in the ECO button is lit
green
R the outside temperature is above 0 †
R the vehicle is below 2500 m above sea level
R the hood is closed
R the driver's seat belt is fastened
R on vehicles with a manual transmission, the
doors are closed
R on vehicles with an automatic transmis-
sion, the driver's door is closed
i All of the driving systems remain active
when the engine is switched off automati-
cally.
i The engine can be switched off automat-
ically a maximum of four times (initial stop,
then three subsequent stops) in succes-
sion. The automatic engine switch-off is
then available again after the ECO symbol
appears in the multifunction display.
Vehicles with automatic transmission If the vehicle is braked to a standstill in
Dor
N, the ECO start/stop function switches off
the engine automatically. Automatic engine start The engine is started automatically if:
R
you switch off the ECO start/stop function
by pressing the ECO button
R you engage reverse gear Ror park position
P
R the vehicle begins to roll away
R the battery's condition of charge is too low
R on vehicles with a manual transmission, the
driver's seat belt is not fastened or a door
is opened
R on vehicles with an automatic transmis-
sion, the driver's seat belt is not fastened
or the driver's door is opened
If you open the hood after an automatic
engine switch-off, automatic engine start is
deactivated. Once the hood is closed, you
have to start the engine manually.
Vehicles with automatic transmission The engine is started automatically if you:
R
release the brakes when in transmission
position Dor N
R depress the accelerator pedal
R open the driver's door
R unfasten your seatbelt
i If you shift the transmission from Rto D,
the ECO start/stop function is available
again as soon as the 00A7symbol reap-
pears in the multifunction display.
Activating/deactivating ECO Start Driving
141Driving and parking Z
i
If you switch off the engine at a low out-
side temperature and add DEF, restart the
engine after refueling. If you leave the vehi-
cle parked without restarting the engine
and the DEF freezes in the DEF tank, the
on-board computer will only be able to reg-
ister the new fill level after a defrosting
period of up to 60 minutes. During this time
the engine may only be operated in neutral.
You will find further information on DEF in the
"Service products" section (Y page 321).
Refueling procedure DEF filler neck in the engine compartment
X
Remove the key from the ignition lock.
X Switch off the auxiliary heating system
(Y page 130).
X Open the hood.
X Close all vehicle doors so that no ammonia
vapors can enter the vehicle.
i Do not inhale any ammonia vapor which
may escape when you unscrew cap 0043.
Ammonia vapors have a pungent odor.
However, they are neither toxic nor hazard-
ous to health in this concentration.
X Turn blue cap 0043counter-clockwise and
remove it.
X Only fill up the DEF tank until the DEF level
is visible in the filler neck.
X Replace blue DEF filler neck cap 0043on the
filler neck and turn clockwise.
You will hear a click when cap 0043is fully
closed. DEF filler neck on the right-hand vehicle
side The DEF reservoir on the right-hand side of the
vehicle (example: Cab Chassis)
Fuel filler cap
X
Remove the key from the ignition lock.
X Switch off the auxiliary heating system
(Y page 130).
X Remove tool 0083for unlocking tank filler
cap 0044from the footwell on the co-driver's
side (Y page 276).
X Close all vehicle doors so that no ammonia
vapors can enter the vehicle.
X Pull cover 0085up, turn 90° and release.
X Insert tool 0083into hole 0087of tank filler
cap 0044.
i Do not inhale any ammonia vapor that
may escape when you unscrew tank filler
cap 0044. Ammonia vapors have a pungent
odor. However, they are neither toxic nor
hazardous to health in this concentration.
X Turn blue filler cap 0044counter-clockwise,
remove it and let it hang from strap 0043.150
RefuelingDriving and parking
Display messages Possible causes/consequences and
0050
0050Solutions 003E
Hood open Hood open You are already driving at walking pace, even though the hood is
not closed.
X
Close the hood. 0064
Please enter PIN: Please enter PIN: You have not yet entered your PIN in the mobile phone.
X
Enter the PIN for the SIM card. 003E
Doors open Doors open You are already driving at walking pace, even though not all the
doors are closed.
X
Close the doors. 00B1
Check wash. fluid Check wash. fluid
level level The washer fluid level is too low.
X
Add washer fluid ( Ypage 257). Key
Display messages Possible causes/consequences and
0050 0050Solutions 0039
Replace key Visit Replace key Visit
workshop workshop The key is no longer working.
X
Visit a qualified specialist workshop. 220
Display
messagesOn-board computer and displays
Problem Possible causes/consequences and
0050
0050Solutions 0076
If you turn the
key in the igni-
tion lock to posi-
tion2, the red
seat belt warn-
ing lamp lights
up for approx-
imately
6 seconds. The warning lamp is to remind you to fasten your seat belt.
X
Fasten seat belt (Y page 48).0049
When the key is
turned to posi-
tion2in the igni-
tion lock, the
yellow bulb
warning lamp
lights up. One of the exterior lighting bulbs is faulty, with the exception of
the perimeter lamps and the trailer lighting.
i
Depending on the equipment, the bulb failure indicator can fail
for all lamps with the exception of the turn signal lamps.
X Replace the faulty bulb as soon as possible (Y page 100).003E
The yellow "door
open" indicator
lamp is lit while
driving. The vehicle is moving without all doors or the hood being closed.
X
Close the doors or hood. 003E
The yellow "door
open" indicator
lamp is lit. The electrical step has retracted or extended only partially or not
at all.
X
Make sure there is sufficient free space for the electrical step.
X Open or close the sliding door again.
X If the electrical step still does not extend or retract fully, push
the step in manually (Y page 74). Before stepping out, remind
the passengers that the step is missing. 230
Indicator and warning lamps in the instrument clusterOn-board computer and displays
Useful information
This Operator's Manual describes all models
as well as standard and optional equipment
of your vehicle that were available at the time
of going to print. Country-specific variations
are possible. Note that your vehicle may not
be equipped with all of the described func-
tions. This also applies to systems and func-
tions relevant to safety.
Read the information on qualified specialist
workshops (Y page 26). Engine compartment
Hood
Opening the hood G
WARNING
If the hood is unlatched, it may open up when
the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving. G
WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department. G
WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following. If you have to carry out work in the engine
compartment, only touch the following com-
ponents:
R
hood
R oil dipstick
R engine oil filler neck cap
R washer fluid reservoir cap G
WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is a risk of injury.
If you need to do any work inside the engine
compartment:
R switch off the ignition
R never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
R remove jewelery and watches
R keep items of clothing and hair, for exam-
ple, away from moving parts G
WARNING
The fuel injection system operates with a high
voltage. If you touch the live components, you
could receive an electric shock. There is a risk
of injury.
Never touch components of the fuel injection
system when the ignition is switched on.
The live components of the fuel injection sys-
tem are, for example, the injectors.
! Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield
wipers or the hood. 250
Engine compartmentMaintenance and care
Hood release lever in the driver's footwell
X Stop your vehicle as far away from traffic
as possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Pull release handle 0043on the hood.
The hood is released. X
Reach into the gap and push grip 0044on the
hood catch upwards. X
Swing the hood upwards until support strut
0087 engages and the hood is supported. Closing the hood G
WARNING
If the hood is unlatched, it could tip forward
during rapid deceleration of the vehicle and
hit persons or objects within its path. There is
a risk of an accident and injury.
Therefore, always make sure that the hood is
closed and locked completely before driving
off.
If the hood is not locked and you are already
driving at walking pace:
R the yellow 003Eindicator lamp in the
instrument cluster goes on for vehicles
without steering-wheel buttons.
R the 003E Hood open Hood open display appears for
vehicles with steering-wheel buttons.
! When you press the support strut back,
make sure that you do not press it against
the detent position and cause it to bend.
! Do not use your hands to push the hood
down. You could damage it otherwise.
X Lift the hood slightly.
X Press support strut 0087towards the back.
X Lower the hood and allow it to fall with
momentum from a height of approximately
1 ft (30 cm).
The hood locks audibly.
X Check that the hood is correctly locked.
If the hood can be raised slightly, it is not
properly engaged.
i If the hood is not correctly engaged, open
the hood again. Let the hood fall with a little
more momentum. Engine compartment
251Maintenance and care Z
For vehicles with a red oil dipstick, only check
the oil level when the engine is at normal
operating temperature:
X Stop your vehicle as far away from traffic
as possible on level ground.
X Secure the vehicle to prevent it from rolling
away.
X Switch off the engine.
X Wait for five minutes.
For vehicles with a yellow oil dipstick, only
check the oil level when the engine is cold.
X Stop your vehicle as far away from traffic
as possible on level ground.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 250).
X Pull out oil dipstick 0043.
X Wipe oil dipstick 0043using a lint-free cloth.
X Insert oil dipstick 0043back into the guide
tube as far as it will go and remove it again.
If the level is between minimum mark 0087
and maximum mark 0044, the oil level is cor-
rect.
X If the oil level has dropped to or below min-
imum mark 0087, open cap 0085and add
engine oil (Y page 254).
The difference in quantity between
marks 0044and 0087is approximately
2 US quarts (2 l).
X Close the hood.
OM651 4-cylinder diesel engine: At outside temperatures between 32 ‡
(–0 †) and 86
‡(30 †) you can measure the
oil level when cold.
Measuring the engine oil when the engine is
cold is less precise than measuring when the
engine is at normal operating temperature.
When the appropriate warning is shown in the
display
X Adding engine oil (Y page 254)
Or
X Have engine oil siphoned off.
Adding engine oil G
WARNING
If engine oil comes into contact with hot com-
ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next
to the filler neck. Let the engine cool down
and thoroughly clean the engine oil off the
components before starting the engine.
! The alternator is located below the engine
oil filler neck. If engine oil spills onto the
alternator, there is a danger of alternator
damage. Be very careful when adding
engine oil. H
Environmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful
to the environment.
! Do not add too much oil. adding too much
engine oil can result in damage to the
engine or to the catalytic converter. Have
excess engine oil siphoned off.
! Do not use any additives in the engine oil.
This could damage the engine.
X Open the hood (Y page 250).
X Unscrew and remove cap 0085.
X Add engine oil. 254
Engine compartmentMaintenance and care
X
Place cap 0043on the filler neck and tighten.
When doing so, make sure that the cap
engages correctly.
X Check the oil level with the oil dipstick
(Y page 253) or on the display
(Y page 252).
X Close the hood. Coolant
G
WARNING
The engine cooling system is pressurized, par-
ticularly when the engine is warm. When
opening the cap, you could be scalded by hot
coolant spraying out. There is a risk of injury.
Let the engine cool down before opening the
cap. Wear eye and hand protection when
opening the cap. Open the cap slowly half a
turn to allow pressure to escape.
Only check the coolant level and/or fill the
coolant if the vehicle is on a level surface and
the engine has cooled down. The coolant tem-
perature must be below 122 ‡ (50 †).
! Check the engine cooling and heating sys-
tem regularly for leaks.
If a large quantity of coolant is lost, have
the cause traced and rectified at a qualified
specialist workshop. G
WARNING
Coolant contains glycol and is therefore toxic.
Do not swallow the coolant. See a doctor
immediately if you swallow coolant.
Make sure that coolant does not come into
contact with skin, eyes or clothing. In case of
contact with eyes, rinse immediately with
plenty of clean water. Clean affected areas of
skin and clothing with soap and water imme-
diately. Change any affected clothing imme-
diately. G
WARNING
If antifreeze comes into contact with hot com-
ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Let the engine cool down before you add anti-
freeze. Make sure that antifreeze is not spilled
next to the filler neck. Thoroughly clean the
antifreeze from components before starting
the engine.
! Take care not to spill any coolant on
painted surfaces. You could otherwise
damage the paintwork. Example: cap and coolant expansion tank
Checking the coolant level
X
Stop your vehicle as far away from traffic
as possible on level ground.
X Switch off the engine.
X Secure the vehicle to prevent it from rolling
away.
X Open the hood (Y page 250).
X Slowly turn cap 0043half a turn counter-
clockwise to allow excess pressure to
escape.
X Turn cap 0043further and remove it.
X Check the coolant level.
If the coolant reaches the maximum mark
on coolant expansion tank 0044, there is
enough coolant in coolant expansion
tank 0044. Engine compartment
255Maintenance and care Z