Problems with the fuel and fuel tank
If your vehicle is losing fuel, the fuel lines or thefuel tank are defective.
XTurn the key immediately to position 0in the
ignition lock and remove it.
XDo not restart the engine under any circum-
stances.
XConsult a qualified specialist workshop.
If the fuel tank has been run dry, after refueling
carry out the following steps:
XBefore starting the engine: switch on the igni-
tion three or four times.
XTurn the key to position 2in the ignition lock
(Ypage 119).
The % preglow indicator lamp in the instru-
ment cluster lights up briefly.
XOnce the %preglow indicator lamp goes
out, turn the key to position 3in the ignition
lock and release it as soon as the engine is
running.
You can start the diesel engine without preglow
when the engine is warm.
Diesel Exhaust Fluid (DEF)
Important safety notes
!Only use DEF in accordance with
ISO 22241. Never mix DEF with additives or
thin it with tap water. The exhaust gas after-
treatment may otherwise be damaged.
Observe the MB Specifications for Service
Products, Sheet 352.0.
Damage that results from the use of additives
or tap water leads to the loss of the New
Vehicle Limited Warranty.
!If DEF comes into contact with a painted or
aluminum surface, wash the surface off
immediately with plenty of water.
!DEF is not a diesel additive and must not be
mixed with fuel in the tank. Even small
amounts of DEF can cause engine damage.
Damage that results from the blending of DEF
will not be covered by the New Vehicle Limi-
ted Warranty.
iIf the outside temperature is below 12 ‡
( Ò 11 †) it may be difficult to top up. If the DEF
is frozen and there is an active warning indi- cator, topping up may not be possible. Park
the vehicle in a warm place, e.g. in a garage,
until the DEF has become liquid again. Top-
ping up is then possible again. Alternatively,
have the DEF tank refilled at a qualified spe-
cialist workshop.
iIf you add DEF at temperatures below 12 ‡
( Ò 11 †) it is possible that the level is not
shown correctly due to the frozen DEF.
Drive for at least 20 minute s(heating phase in
the tank activated) and then st
op the vehicle
for at least 30 seconds. The level is then
shown correctly.
You will find further information on DEF in the
"Service products" section (
Ypage 277).
Refueling procedure
DEF filler neck
Non-lockable DEF filler cap
Example: DEF filler cap in the engine compartment
XTo open: switch off the ignition.
XOpen the hood (Ypage 218).
XTurn filler cap :counter-clockwise and
remove it.
XTo close: replace cap :on the filler neck and
turn it clockwise.
You will hear a click when cap :is fully
closed.
XClose the hood (Ypage 219).
Refueling129
Driving and parking
Z
Lockable filler cap
Example: DEF filler cap in the engine compartment
XTo open:switch off the ignition.
XOpen the hood (Ypage 218).
XRemove tool ?for unlocking tank filler
cap :from the footwell on the front-
passenger side (
Ypage 240).
XPull cover =up, turn 90° and release.
XInsert tool ?into hole ;of tank filler cap :.
XTurn filler cap:counter-clockwise and
remove it. Make sure that tool ?remains in
tank filler cap :while doing so.
XTo close: replace filler cap :and turn it
clockwise until closed.
XPull tool ?out of tank filler cap :and stow
with the vehicle tool kit in the footwell on the
front-passenger side.
XPull cover =up over hole ;of tank filler
cap :, turn and release.
XTurn tank filler cap :.
If tank filler cap :turns freely, the DEF tank
is closed.
Parking
Important safety notes
GWARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot 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:
Rrelease the parking brake.
Rshift the automatic transmission out of the
parking position P.
Rstart 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.
!A moving vehicle can lead to damage to the
vehicle or damage to the drive train.
!When the vehicle is parked, always remove
the key to prevent the battery from becoming
discharged.
On vehicles with a battery isolating switch,
switch off the power supply if the vehicle is to
be out of use for a longer period of time.
130Parking
Driving and parking
ProblemPossible causes/consequences andMSolutions
7
The red seat belt
warning lamp
lights up continu-
ously or flashes. A
warning tone may
also sound.The warning lamp is to remind you to fasten your seat belt.
XFasten seat belt (Ypage 42).
bWhen the key is
turned to position
2in the ignition
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.
iDepending on the equipment, the bulb failure indicator can fail for
all lamps with the exception of the turn signal lamps.
XReplace the faulty bulb as soon as possible (Ypage 86).
1 The yellow "door
open" indicator
lamp is lit while
driving.The vehicle is moving without all doors or the hood being closed.
XClose the doors or hood.
1The yellow "door
open" indicator
lamp is lit.The electrical step has retracted or extended only partially or not at all.
XMake sure there is sufficient free space for the electrical step.
XOpen or close the sliding door again.
XIf the electrical step still does not extend or retract fully, push the
step in manually (Ypage 67). Before stepping out, remind the pas-
sengers that the step is missing.
Ð The indicator
lamp for the
steering is lit
when the ignition
is switched on.The power assistance for the steering has malfunctioned. You need to
steer more forcefully.
XCarefully continue to a qualified specialist workshop and have the
steering checked immediately.
Indicator and warning lamps in the instrument cluster203
On-board computer and displays
Z
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 possi-
ble. Note that your vehicle may not be equipped
with all of the described functions. This also
applies to systems and functions relevant to
safety.
Read the information on qualified specialist
workshops (
Ypage 26).
Engine compartment
Hood
Important safety notes
GWARNING
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.
GWARNING
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.
GWARNING
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:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
GWARNING
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 system
are, for example, the injectors.
GWARNING
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 com-
partment, only touch the following components:
RHood
ROil dipstick
REngine oil filler neck cap
RWasher fluid reservoir cap
RCoolant expansion tank cap
Opening the hood
!Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield wip-
ers or the hood.
218Engine compartment
Maintenance and care
Releasehandle for th ehoo d
Observe the safety notes when youopen the
hood.
XStop your veh icleas far away fr omtraff icas
possible on level ground.
XSwitch off the engine.
XSecure the veh icleto prevent itfrom rolling
away.
XPull release handle :onthe hood.
The hoodis released.
XReach into the gap and push lever ;onthe
hoo d catch up.
XSwin g the hood upwards unt ilsupport strut
= engages and the hood issupported.
Closing the hood
GWARNIN G
If the hoodis unlatched, it could tip forward
during rapid decelerati on ofthe vehicle and
hit persons or objectswithin its path. There is
a risk ofan accident and injury.
Therefore, always make sure that the hood is
closed and locked co mpletely before driv ing
off.
If the hood is not locked and you are alrea dy
driving at walkingpace:
Rthe yellow 1indicat or lamp in theinstru-
ment cluster goes onfor vehicles without
steering-wheel butto ns.
Rthe 1 Hoodopendisp lay appears for vehi-
cles with steering-wheel butto ns.
!When you press the support strut back,
make sure that you do not press it against the
detent position and cause itto bend.
!Do no t use your hands to push thehood
down .You could damage it otherwise.
XLift the hood slightly.
XPress support strut =towards the back.
XLowe r the hood and allow itto fall with
mom entum fr oma height of approximat ely
1 ft (30 cm).
The hood locks audibly.
XChec k that the hood is correctly locke d.
If the hood can beraised slightly, it is not
properly engaged. If the hood is not correctly
engaged, openthehood again. Let the hood
fall with a little moremom entum.
Engine compartment219
Maintenance and care
Z
EngineoilAdd1.0 quart
XAdd the amount of oil
shown (Ypage 222).
XCheck the engine oil level
again after a few minutes.
EngineoilAdd1.5quarts
EngineoilAdd2.0quarts
EngineoillevelReduceoillevel
The oil level is too high.
XHave excess oil removed.
Eng. oillev. Turnignitionon forlevel
XTurn the key to position2in
the ignition lock.
Observewait.period
XRepeat the engine oil
measurement after about
5 minutes if the engine is at
normal operating tempera-
ture.
XRepeat the engine oil
measurement after about
30 minutes if the engine is
not at normal operating
temperature.
Engineoillevel Notwhen eng.running
XSwitch off the engine when it is at normal operating
temperature and wait
approximately 5 minutes
before measuring the
engine oil level.
Measurement units in the display:
RqtsUSA only
RltrCanada only
Checking the oil level using the oil dip-
stick
Example: 4-cylinder diesel engine
Example: 6-cylinder diesel engine
For vehicles with a red oil dipstick, only check
the oil level when the engine is at normal oper-
ating temperature:
XStop your vehicle as far away from traffic as
possible on level ground.
XSecure the vehicle to prevent it from rolling
away.
XSwitch off the engine.
XWait 5 minutes.
For vehicles with a yellow oil dipstick, only check
the oil level when the engine is cold.
XStop your vehicle as far away from traffic as
possible on level ground.
XSecure the vehicle to prevent it from rolling
away.
XOpen the hood (Ypage 218).
XPull out oil dipstick :.
XWipe oil dipstick:using a lint-free cloth.
Engine compartment221
Maintenance and care
Z
XInsert oil dipstick:back into the guide tube
as far as it will go and remove it again.
If the level is between minimum mark =and
maximum mark ;, the oil level is correct.
XIf the oil level has dropped to or below mini-
mum mark=, open cap ?and add engine oil
(
Ypage 222).
The difference in quantity between marks ;
and =is approximately 2 qt (2 l).
XInsert the oil dipstick into the guide tube as far
as it will go.
XClose the hood (Ypage 219).
OM651 4-cylinder diesel engine:
At outside temperatures between 32 ‡ (–0 †)
and 86 ‡ (30 †), the oil level can be checked
when the engine is 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
XAdd engine oil (Ypage 222)
or
XHave engine oil siphoned off.
Adding engine oil
GWARNING
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 com-
ponents before starting the engine.
!The alternator is located below the engine
oil filler neck. If engine oil spills onto the alter-
nator, there is a danger of alternator damage.
Be very careful when adding engine oil.
HEnvironmental 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.
XOpen the hood (Ypage 218).
XUnscrew and remove cap ?.
XAdd engine oil.
XReplace cap?on the filler neck and tighten.
When doing so, make sure that the cap
engages correctly.
XCheck the oil level with the oil dipstick
(Ypage 221) or on the display (Ypage 220).
XClose the hood.
Coolant
GWARNING
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 cool-
ant if the vehicle is on a level surface and the
engine has cooled down. The coolant tempera-
ture 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 spe-
cialist workshop.
GWARNING
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.
222Engine compartment
Maintenance and care
Example: cap and coolant expansion tank
Checking the coolant level
XStop your vehicle as far away from traffic as
possible on level ground.
XSwitch off the engine.
XSecure the vehicle to prevent it from rolling
away.
XOpen the hood (Ypage 218).
XSlowly turn cap:half a turn counter-clock-
wise to allow excess pressure to escape.
XTurn cap :further and remove it.
XCheck the coolant level.
If the coolant reaches the maximum mark on
coolant expansion tank ;, there is enough
coolant in coolant expansion tank ;.
Adding coolant
XIf the coolant drops under the minimum mark
on coolant expansion tank ;, add coolant to
the maximum mark.
Observe the information on coolant mixture
ratio and water quality in the "Technical data"
section (
Ypage 283). To prevent damage to
the engine cooling system, use only approved
corrosion inhibitor and antifreeze that com-
plies with the Mercedes-Benz Specifications
for Service Products.
XReplace cap :and turn it clockwise to
tighten.
XStart the engine.
XAfter approximately 5 minutes, switch off the
engine and allow it to cool down.
XCheck the coolant level again and add coolant
if necessary.
XClose the hood.
Brake fluid
GWARNING
Service products may be poisonous and haz-
ardous to health. There is a risk of injury.
Comply with instructions on the use, storage
and disposal of service products on the labels
of the respective original containers. Always
store service products sealed in their original
containers. Always keep service products out
of the reach of children.
Brake fluid is hazardous to health. Also observe
the safety notes in the "Service products and
capacities" section (
Ypage 277).
GWARNING
The brake fluid constantly absorbs moisture
from the air. This lowers the boiling point of
the brake fluid. If the boiling point of the brake
fluid is too low, vapor pockets may form in the
brake system when the brakes are applied
hard. This would impair braking efficiency.
There is a risk of an accident.
You should have the brake fluid renewed at
the specified intervals.
!Brake fluid corrodes paint, plastic and rub-
ber. If paint, plastic or rubber has come into
contact with brake fluid, rinse with water
immediately.
Have the brake fluid renewed every 2 year sat a
qualified specialist workshop. Observe the infor- mation on brake fluid in the "Technical data"
section (
Ypage 283).
Check the brake fluid level regularly, e.g. weekly
or when refueling.
Engine compartment223
Maintenance and care
Z