2018 MERCEDES-BENZ METRIS engine

Engine
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
;NThe yellow Check Engine warning lamp lights up while the engine is running.
There may be a malfunction, for example:
Rin the engine management
Rin the transmission management
Rin the fuel injection system
Rin the exhaust system
Rin the ignition system (for vehicles with a gasoline engine)
Rin the fuel system
The emission limit values may be exceeded and the engine may be running in
emergency mode.
XHave the vehicle checked as soon as possible at a qualified specialist workshop.
æN The yellow reserve fuel warning lamp is on while the engine is running.
The fuel level has dropped to the reserve range.
XRefuel at the nearest gas station.
?N The red coolant warning lamp comes on while the engine is running.
On vehicles without steering wheel buttons, the coolant temperature gage is at the
start of the bar display (
Ypage 175).
On vehicles with steering wheel buttons, the coolant temperature gage is at the
start of the scale in the instrument cluster (
Ypage 39).
The temperature sensor for the coolant temperature gage is faulty.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
XStop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine. Do not continue driving under any circumstances.
XSecure the vehicle to prevent it from rolling away (Ypage 135).
XConsult a qualified specialist workshop.
Indicator and warning lamps in the instrument cluster227
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
?NThe red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled sufficiently.
XObserve the display messages.
XStop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
XSecure the vehicle to prevent it from rolling away (Ypage 135).
XExit the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 255).
XIf you have to add coolant more frequently, have the engine cooling system
checked.
XMake sure that the air supply to the radiator is not obstructed, by frozen slush
for example.
XCheck the coolant temperature:
Rusing the display in the on-board computer on vehicles without steering wheel
buttons (Ypage 175)
Rusing the analog display in the instrument cluster on vehicles with steering
wheel buttons (Ypage 39)
XDo not start the engine again until the coolant temperature is below the maxi-
mum value specified below. The engine could otherwise be damaged.
XDrive to the nearest qualified specialist workshop.
Avoid heavy loads on the engine, e.g. driving in mountainous terrain, and stop-
start traffic.
Under normal operating conditions and with the specified coolant level, the cool-
ant temperature gage may rise to 248 ‡ (120 †).
?N The red coolant warning lamp comes on while the engine is running. An addi-
tional warning tone sounds.
The coolant temperature has exceeded the maximum value specified below. The
airflow to the engine radiator may be blocked or the coolant level may be too low.
GWARNING
The engine is not being cooled adequately and could become damaged.
Never drive with an overheated engine. Otherwise, fluids which may have leaked
into the engine compartment could catch fire.
In addition, steam from an overheated engine can cause serious burns, which can
occur just by opening the hood.
There is a risk of injury.
XObserve the display messages.
XStop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
XSecure the vehicle to prevent it from rolling away (Ypage 135).
228Indicator and warning lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
XExit the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 255).
XIf you have to add coolant more frequently, have the engine cooling system
checked.
XMake sure that the air supply to the radiator is not obstructed, by frozen slush
for example.
XCheck the coolant temperature:
Rusing the display in the on-board computer on vehicles without steering wheel
buttons (Ypage 175)
Rusing the analog display in the instrument cluster on vehicles with steering
wheel buttons (Ypage 39)
XIf the coolant temperature is below the maximum value specified below, you can
continue driving to the nearest qualified specialist workshop.
Avoid heavy loads on the engine, e.g. driving in mountainous terrain, and stop-
start traffic.
Under normal operating conditions and with the specified coolant level, the cool-
ant temperature gage may rise to 248 ‡ (120 †).
Driving systems
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
·NThe red distance warning lamp lights up while the vehicle is in motion.
The distance to the vehicle in front is too small for the speed selected.
XIncrease the distance.
·N The red distance warning lamp lights up while the vehicle is in motion. An
additional warning tone sounds.
You are approaching a vehicle or a stationary obstacle in your line of travel at too
high a speed.
XBe prepared to brake immediately.
XPay particular attention to the traffic situation. You may have to brake or take
evasive action.
Further information about the distance warning function can be found under
"COLLISION PREVENTION ASSIST" (
Ypage 146).
Indicator and warning lamps in the instrument cluster229
On-board computer and displays
Z

Vehicle
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
ÐNThe red power steering warning lamp is lit while the engine is running. An addi-
tional warning tone sounds.
The steering power assistance could be malfunctioning. You may need to steer
more forcefully.
XCarefully continue to a qualified specialist workshop and have the steering
checked immediately.
1N The yellow "door open" indicator lamp is lit.
A door is not fully closed.
XClose the doors.
Indicator and warning lamps in the instrument cluster231
On-board computer and displays
Z

Cigarette lighter in the front compart-
ment
XTo use the cigarette lighter:turn the key to
position 1in the ignition lock (Ypage 123).
XPress in cigarette lighter :.
The cigarette lighter will pop out automati-
cally when the heating element is red-hot.
XPull the cigarette lighter out of the socket by
its handle.
The cigarette lighter socket can be used for
accessories with a maximum power consump-
tion of 180 W (15A).
If you use th esockets to connec taccessories
fo rlon gperiod swhe nth eengin eis switched off,
th estarter battery may discharge. An emer -
gency cut-off ensures that th eon-boar dvoltage
doe sno tdro pto olow. If th eon-boar dvoltage is
to olow, powe rto th esocke tis automatically
cut .Thi sensures that ther eis sufficien tpowe r
to start th eengine.
12 Vsocket
Whe nth eke yis turned to position 1in th eigni-
tion lock, th esockets can be used fo raccesso- rie
swit h a maximum powe rconsumption of
18 0 W (15 A) .
If you use th esockets fo rlon gperiod swhe nth e
engin eis switched off, th estarter battery may
discharge. If th eon-boar dvoltage is to olow, it
might then no longer be possible to start th e
engine.
The socke tin th ecenter console an dth esocke t
in th esid eof th ecargo compartment are no t
automatically deactivated if th eon-boar dvolt -
age is low. The additional sockets in th erear
compartment are automatically deactivated if
th eon-boar dvoltage is low.
Additional 12 Vsockets may be located in th e
corner trim next to th etailgate an din th esid e
trim on th elef tan dright-han dsides.
XLif tup th ecove rof socke t: .
Mobile communications equipment
GWARNING
Operatin gmobile information systems an d
communication devices whil edrivin gwill dis -
tract you from traffic conditions. In addition ,
you could then los econtro lof th evehicle.
There is aris kof an accident.
Only operat ethese devices whe nth evehicle
is stationary.
Observe th elegal requirements fo rth ecountr y
in whic hyou are currently drivin gwhe noperat -
in g mobile communication equipment .
Please remember, anavigation syste mdoe sno t
supply information on th eload-bearin gcapacity
of bridge sor th eoverhead clearance of under -
passes. The drive rremains responsible fo r
safet yat all times.
You an dother scan suffe rhealth-related dam -
age through electromagnetic radiation .By usin g
an exterio rantenna, apossible health ris k
caused by electromagnetic fields ,as discussed
in scientific circles ,is take ninto account. Only
hav eth eexterio rantenn ainstalled by aqualifie d
specialis tworkshop .
Failur eto observe th eMercedes-Ben zinstalla-
tion specification scan result in th einvalidation
of your vehicle' soperatin gpermit .
You will fin d
i
nformation on retrofitting electrical
or electronic equipment under “Vehicle elec -
tronics” (
Ypage 305).
Mobile communications equipment243
Stowing an d features
Z

In the event of an accident, have a damaged
cargo compartment floor or loading area, the
cargo tie-down rings and the tie down checked
at a specialist workshop. Otherwise, the load
may not be correctly secured the next time any-
thing is stowed.
Even if you follow all loading guidelines, the load
increases the risk of injury in the event of an
accident. Observe the information in the "Secur-ing a load" (
Ypage 246) and "Load distribution"
(Ypage 245) sections.
You will find information about the maximum
roof load under "Cargo tie-down points and car-
rier systems" (
Ypage 314). You will find infor-
mation about roof carriers under "Carrier sys-
tems" (
Ypage 250).
Before loading
!
The anti-slip mats cannot be used for secur-
ing goods and must be replaced when they
show signs of:
RPermanent deformation and crushing
RCrack formation
RCuts
XTire pressure: check the tire pressure and
correct if necessary (Ypage 282).
XCargo compartment floor: clean the cargo
compartment floor.
The cargo compartment floor must be free
from oil and dust, dry and swept clean to pre-
vent the load from slipping.
XPlace non-slip mats (anti-slip mats) on the
cargo compartment floor if necessary.
During loading
XObserve the gross axle weight rating and per-
missible gross vehicle weight for your vehicle.
Take into account that your vehicle's curb
weight is increased if accessories or optional equipment are installed. The maximum pay-
load is thus reduced.
XObserve the notes on load distribution
(Ypage 245).
The overall center of gravity of the load should
always be as low as possible, centered and
between the axles near the rear axle.
XSecure the load (Ypage 246).
Observe the legal requirements of the country
in which you are currently driving.
Checks after loading
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tail-
gate/rear door is open when the engine is
running, particularly if the vehicle is moving,
exhaust fumes could enter the passenger
compartment. There is a risk of poisoning.
Turn off the engine before opening the tail-
gate/rear door. Never drive off with the tail-
gate/rear door open.
XSecuring luggage/loads: make sure that
the luggage and/or load is secure before
every journey and at regular intervals during a
long journey, and correct it if necessary.
XDoors/tailgate: close the sliding doors and
tailgate/door.
XTire pressure: adjust the tire pressure
according to the vehicle load (Ypage 282).
XDriving style: adapt your driving style
according to the vehicle load.
Load distribution
General notes
!
Excessive loads on individual points of the
cargo floor or on the load surface impair vehi-
cle handling characteristics and could cause
damage to the floor covering.
The overall center of gravity of the load should
always be as low as possible, centered and
between the axles near the rear axle.
Load distribution245
Transporting loads
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 31).
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. Before
every trip, ensure that the hood is locked.
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 ignition system operates with a high volt- age. If you touch the live components, you
could receive an electric shock. There is an
increased risk of injury.
Never touch components of the ignition sys-
tem if:
Rthe engine is running or being started
Rthe key is in radio position or drive position
in the ignition lock
The live components of the ignition system are,
for example:
Rignition coils
Rspark plug connectors
Rdiagnostic sockets
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
252Engine compartment
Maintenance and care

Opening the hood
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
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.
!Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield wip-
ers or the hood.
Observe the safety notes when you open the
hood.
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 (Ypage 135).
XPull release handle :on the hood.
The hood is released.
XReach into the gap and push lever ;on the
hood catch to the left.
XRaise the hood and hold it in that position.
XPull support strut ?out of retainer =and
guide it up in the direction of the arrow.
XLower the hood in such a way that support
strut ?glides into recess Aand the hood
engages.
Closing the hood
GWARNING
Cloths or other flammable materials left in the
engine compartment can ignite if they come
into contact with the exhaust system or parts
of the engine that heat up. There is a risk of
fire. After carrying out maintenance work,
make sure that no extraneous flammable
material is left in the engine compartment or
on the exhaust system.
!Do not use your hands to push the hood
down. You could damage it otherwise.
Engine compartment253
Maintenance and care
Z