check engine MERCEDES-BENZ G-CLASS SUV 2016 Owner's Guide

Engine
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ;
N
The yellow engine diagnostics warning lamp lights up whil ethe engine is run-
ning.
There may be afault with the following, for example:
R engine management
R fuel injection system
R exhaust system
R fuel system
The emission limit values may be exceeded and the engine may be runnin gin
emergenc ymode.
X Consult aqualified specialist workshop immediately.
Vehicles with adiesel engine: the fuel tank has been run dry (Y page 110).
X Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergenc ymode is
cancelled. The vehicle does not have to be checked. 8
N
The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops into the
reserve range.
X Refuel at the nearest filling station. %
N
On diesel engine vehicles, the preglow indicator lamp does not light up when the
key is in position 2(Y page 96).
The preglow system is malfunctioning.
X Consult aqualified specialist workshop immediately. ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature display is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored. The engine could be dam-
aged if the coolant temperature is too high.
X Stop the vehicle immediately,p aying attention to road and traffic conditions,
and switch off the engine. Do not continue driving.
X Secure the vehicle against rolling away (Y page 113).
X Consult aqualified specialist workshop. 162
Warning and indicator lamps on the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signa ltype
Possible causes/consequences and M
MSolutions ?
N
The red coolant warning lamp lights up 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 not being cooled sufficiently.
X Observe the additional display messages on the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X Secure the vehicle against rolling away (Y page 113).
X Leave the vehicle and keep asafe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 215).
X If you have to top up the coolant frequently, have the engine cooling system
checked.
X Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X Do not start the engine again until the coolant temperature is below 120 †. The
engine may otherwise be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic. ?
N
The red coolant warning lamp lights up while the engine is running.
The coolant temperature has exceeded 120 †. The airflow to the engine radiator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Drivin gwhen your engine has overheated
can cause any fluids that may have leaked into the engine compartment to catch fire.
In addition, steam from an overheated engine can cause serious burns, which can
occur just by opening the bonnet.
There is arisk of injury.
X Observe the additional display messages on the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X Secure the vehicle against rolling away (Y page 113).
X Leave the vehicle and keep asafe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 215).
X If you have to top up the coolant frequently, have the engine cooling system
checked. Warning and indicato
rlamps on the instrument cluster
163On-boardcomputer and displays Z

Warning/
indicator
lamp
N N
Signa ltype
Possible causes/consequences and M
MSolutions X
Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X If the coolant temperature is below 120 †, you can continue driving to the
nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic. Tyres
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions h
N
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction) is
lit.
The tyre pressure monitor has detected aloss of pressure in at least one of the
tyres.
G WARNING
Underinflated tyres pose the following risks:
R the tyres may burst, especially as the load and vehicle speed increase
R the tyres may wear excessively and/or unevenly, which may greatly impair tyre
traction
R the driving characteristics, as well as steerin gand braking, may be greatly
impaired
There is arisk of an accident.
X Stop the vehicle without making any sudden steerin gorbraking manoeuvres.
Pay attention to the traffic conditions as you do so.
X Secure the vehicle against rolling away (Y page 113).
X Observe the additional display messages on the multifunction display.
X Check the tyres and, if necessary, follow the instructions for aflat tyre
(Y page 224).
X Check the tyre pressure (Y page 239).
X If necessary, correc tthe tyre pressure. h
N
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction)
flashes for approximately one minute and then remains lit.
The tyre pressure monitor is faulty.
G WARNING
The system is possibly unable to detect or register low tyre pressure.
There is arisk of an accident.
X Observe the additional display messages on the multifunction display.
X Consult aqualified specialist workshop immediately. 164
Warning and indicator lamps on the instrument clusterOn-board computer and displays

The bonnet release lever is in the footwell on the
left-hand side of the vehicle when viewed in the
direction of travel.
X Make sure that the windscreen wipers are
switched off.
X Pull bonnet release lever :.
The bonnet is released. X
Lift the bonnet slightly.
X Push bonnet catch ;in the direction of the
arrow and lift the bonnet.
The bonnet is opened and held open auto-
matically by the gas-filled strut.
Closing the bonnet X
Lower the bonnet and let it fall from aheight
of approximately 20 cm.
X Check that the bonnet has engaged properly.
If the bonnet can be raiseds lightly, it is not
properl yengaged .Open it again and close it
with alittle more force. Radiator
Do not cover up the radiator. Do not use thermal mats, insect protection covers or anything sim-
ilar. Otherwise, the valuesoft he Europeanon-
board diagnostics may be affected .Some of
thes evalue sare required by la wand must
always be correct. Engine oil
Importan tsafety notes G
WARNING
Certain components in th eengine compart-
ment coul dbevery hot, e.g. the engine, the radiator and parts of the exhaust system.
There is
arisk of injury when accessing the
engine compartment.
As far as possible, allow the engine to cool
down and only touch the components descri- bed in the following. G
WARNING
There are moving components in the engine
compartment. Certain components may con-
tinue to move or suddenly move again even
after the ignitio nhas been switched off, e.g.
the radiator fan. There is arisk of injury.
If you have to carry out work in the engine
compartment:
R switch off the ignition
R never touch the dangerous area ssurround-
ing moving components, e.g. the rotation
area of the fan
R remove jewellery and watches
R keep items of clothing and hair, for exam-
ple,a wayfrom moving parts. G
WARNING
If engine oil comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is arisk of fire and injury.
Make sure that engine oil does not spil lout
over the filler neck. Allow the engine to cool
downa nd thoroughly clea nthe components
that have come into contact with engine oil
before you start the engine. G
WARNING
If you open the bonnet while the engine is
overheating or while there is afire in the
engine compartment, you coul dcome into
contact with hot gase sorother leaking ser-
vice products. There is adange rofinjury.
Allow an overheating engine to cool down
before opening the bonnet. If there is afire in
the engine compartment, leave the bonnet
closed and notify the fire brigade. 212
Engine compartmentMaintenanc
eand care

Note
sono illevel Depending on your drivin
gstyle ,the vehicle
consumes up to 0.8 litres of oi lper 1,000 km.
The oi lconsumption ma ybehighe rtha nt his
when the vehicl eisnew or if yo ufrequentl ydrive
at high engine speeds.
To check the oi llev el:
R park the vehicl eonalevel surface
R the engine shoul dbeswitched off for approx-
imatel yfivem inute sifthe engine is at normal
operating temperature
R if the engine is not at normal operating tem-
perature, e.g .ifthe engine wa sonlys tarted
briefly, wait approximately 30 minute sbefore
carrying out the measurement
Checking the oil level using the oil dip-
stick X
Pull dipstick :out of the dipstick tube.
X Wipe off dipstick :.
X Slowly slide oil dipstick :into the guide tube
to the stop and take it out again after approx- imately three seconds.
If the level is between MIN mark =and MAX
mark ;,the oil level is correct.
X If the oil level has dropped to MIN mark =or
below, top up with 1.0 lofe ngine oil.
Checking the oil level using the on-
board computer X
Make sure that the key is in position 2in the
ignition lock.
X Press 9or: on the steering wheel to
select the following message: Engine oil Engine oil
level Measuring now Measurement level Measuring now Measurement
accurate only if vehicle is level accurate only if vehicle is level The measurement takes
afew seconds. You will
see one of the following messages in the multi-
function display:
R Engine oil level OK Engine oil level OK
R Add 1.1 litres eng. oil when next
Add 1.1 litres eng. oil when next
refuelling refuelling
X Top up the oil if necessary.
If the engine is at normal operating temperature and the Engine oil Reduce oil level
Engine oil Reduce oil level dis-
play appears, too much oil has been added.
X Have excess oil siphoned off.
If the Switch ignition on to check
Switch ignition on to check
engine oil level
engine oil level message appears:
X Turn the key to position 2in the ignition lock
(Y page 96).
If the Waiting period for engine oil
Waiting period for engine oil
level not observed
level not observed message appears:
X If the engine is at normal operating tem-
perature:
repeat the measurement after
approximately five minutes.
X If the engine is not at normal operating
temperature:
e.g. if the engine was only star-
ted briefly, repeat the measurement after
approximately 30 minutes.
If the Engine oil level Not when engine Engine oil level Not when engine
on
on message appears:
X Switch off the engine.
X If the engine is at normal operating tem-
perature:wait approximately five minutes
before carrying out the measurement.
X If the engine is not at normal operating
temperature:
e.g. if the engine was only star-
ted briefly, wait approximately 30 minutes
before carrying out the measurement.
If you wish to cancel the measurement ,press
the 9 or: button on the multifunction
steering wheel.
Topping up engineo il !
Use only engine oils and oil filters that are
approved for vehicles with aservice system. A
list of the engine oils and oil filters that have
been tested and approved in accordance with
Mercedes-Benz Specifications for Service
Products is available at any Mercedes-Benz
Service Centre. Engine compartment
213Maintenance and care Z

Allow an overheating engine to coo
ldown
before opening the bonnet. If ther eisafirein
the engine compartment, leav ethe bonnet
closed and notify the fir ebrigade.
Checkin gthe coolant level Example: checking the coolant level
X Park the vehicl eonalevel surface.
Check the coolant level onl yifthe vehicl eis
on alevel surface and the engine ha scooled
down.
X Turn the key to position 2in the ignition lock
(Y page 96).
X Check the coolant temperatur edisplay in the
instrument cluster.
The coolant temperatur emustbeb elow
70 †.
X Slowl yturnc ap : half aturna nti-clockwise
and allo wexcess pressure to escape.
X Turn cap :furthe ranti-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the fille rneck when cold, there is enough
coolant in coolant expansio ntank ;.
If the coolant level is approximately 1.5 cm
above marker bar =in the fille rneck when
warm, there is enoug hcoolant in coolant
expansio ntank ;.
X If necessary ,top up with coolant tha thas
been teste dand approved by Mercedes-Benz.
X Replace cap :and tur nitclockwise as fa ras
it will go.
Furthe rinformatio noncoolant (Y page 253). Topping up the windscreen washe
rsys-
tem/headlamp cleanin gsystem G
WARNING
If wind screen washer concentrate comes into
contact with hot components of the engine or
the exhaust system, it can ignite. There is a
risk of fire and injury.
Make sure the windscreen washer concen-
trate does not come into contact with the filler neck. Example: topping up the windscreen washer
system
X To open: pull cap:upwards by the tab and
open.
X Top up with the premixed washe rfluid.
X To close: press cap :onto the fille rneck
unti lite ngages.
The washe rfluid reservoi risusedf or both the
windscree nwashe rs ystem and the headlamp
cleaning system.
If the washe rfluid level drops belo wthe recom-
mended minimu mof3.5 litres ,amessage
appear sinthe multifunctio ndisplay prompting
yo utot op up the washe rfluid (Y page 154).
Furthe rinformatio nonwashe rfluid
(Y page 254). Service
ASSYST service interval display
Service messages Yo
uc an obtain up-to-dat einformation concern-
ing the servicin gofyour vehicle from aqualified
specialis tworkshop, e.g. aMercedes-Ben zSer-
vice Centre. Service
215Maintenance and care Z

The ASSYST service interval display inform
syou
of the next service due date.
If as ervice due date has been exceeded, you
also hear awarning tone.
The multifunction display shows aservice mes-
sage for afew seconds, e.g.:
Service Ain999,999 km
Service Ain999,999 km
Service Ain..d ays
Service Ain..d ays
Service Adue
Service Adue
Service Aoverdue by 999,999 km
Service Aoverdue by 999,999 km
Service Aoverdue by .. days
Service Aoverdue by .. days
Maintaining the time-dependent service sched-
ule:
X Call up and noted own the service due date
before disconnectin gthe battery.
or X After reconnecting the battery, subtract the
battery disconnection periods from the ser-
vice date shown on the display.
The symbol and the letter indicate which type of service is due:
¯ Minor service A
A
± Major service B B
The ASSYST service interval display does not
take into account any periods of time during
which the battery is connected.
Hiding service messages X
To hide the service message, press the %
back button on the multifunction steering
wheel (Y page 132).
Displaying service messages Use the buttons on the multifunction steering
wheel.
X Switch the ignition on.
X Press =or; to select the standard
display menu on the steering wheel
(Y page 133).
X Press 9or: to select the ASSYST ser-
vice interval display.
The ¯ or± service symbol and the ser-
vice due date are displayed. Special service requirements The prescribed service interval is based on nor-
mal operation of the vehicle. Servic ework will
need to be performed more often if the vehicle is operated under arduous conditions or increased
loads, for example:
R regular city driving with frequent intermediate
stops
R if the vehicle is primarily used to travel short
distances
R for frequent operation in mountainous terrain
or on poor road surfaces
R if the engine is often left idling for long periods
In these or similar operating conditions, have,
for example, the air filter, engine oil and oil filter changed more frequently. The tyres must be
checked more frequently if the vehicle is oper-
ated under increased loads. Further information can be obtained at aqualified specialist work-
shop, e.g. aMercedes-Benz Servic eCentre. Fuel/water separator
! If you continue driving without having the
fuel/wate rseparato rserviced, this could
caus edamag etotheengine. An yresulting
damag eisnotcovered by th ewarranty. H
Environmenta
lnote
Dispose of servic eproduct sinane nviron-
mentally-responsible manner.
If th efuel/water separator needs servicing:
R the ! Clean
Clean the thefuel
fuel filter
filter message
is shown in th emultifunction display
R aw arning tone sounds
X Consult aqualifie dspecialist workshop. Care
General notes
! For cleaning your vehicle, do not use any of
the following:
R dry ,rough or hard cloths
R abrasive cleaning agents
R solvents
R cleaning agents containing solvents
Do not scrub. 216
CareMaintenanc
eand care

Removin
gthe spare wheel The spare wheel is heavy. Observ
ethis when
removing the spare wheel.
X Remove wheel nuts :.
X Remove the spare wheel.
Fitting the wheel After changing
awheel:
X Secure the damaged whee lonthe spare
whee lbracket with whee lnuts :.W hen
doing so, make sure tha tthe whee lcannot
come loose.
X Cover the whee lwitht he tyr eprotection
cover.
X For safety reasons ,regularly check to ensure
tha tthe whee lissecurel yfastened. Flat tyre
Preparing the vehicle
X Sto pthe vehicle as far away as possible from
traffic on solid, non-slippery and level ground.
X Switch on the hazard warning lamps.
X Secure the vehicle against rolling away
(Y page 113).
X If possible, bring the front wheels into the
straight-ahead position.
X Switch off the engine.
X Remove the key from the ignition lock.
The steering wheel lock is active as soon as
the key is removed.
X Make sure that the passengers are not endan-
gered as they get out of the vehicle. Make
sure that no one is near the danger area while
aw heel is being changed. Anyone who is not directly assisting in the wheel change should,
for example, stand behind the barrier.
X Get out of the vehicle. Pay attention to traffic
condition swhen doing so.
X Close the driver' sdoor.
X Place the warning triangle asuitable distance
away (Y page 222). Observe legal require-
ments. Batter
y(vehicle) Importan
tsafety notes
Wor kont hebattery, e.g. removing or fitting,
require sspecialist knowledge and th euse of
special tools. Therefore, always have wor kon
th eb attery carrie dout at aqualified specialist
workshop. G
WARNING
Work carried ou tincorrectly on the battery
can lead, for example, to ashort circui tand
thus damage the vehicl eelectronics. This can
leadtof unction restrictions applying to
safety-relevant systems ,e.g the lighting sys-
tem, the ABS (anti-lock braking system) or the
ESP ®
(Electronic Stability Program). The oper-
ating safety of yourv ehiclemay be restricted.
You coul dlose control of the vehicle, for
example:
R when braking
R in the event of abrupt steering manoeuvres
and/or when the vehicle's spee disnot
adapted to the road conditions
There is arisk of an accident.
In the event of ashort circui torasimilar inci-
dent, contact aqualified specialist workshop
immediately. Do not drive any further. Always have work on the battery carrie dout at a
qualified specialist workshop.
Further information about ABS (Y page52) and
ESP ®
(Y page5 4). G
WARNING
Electrostatic build-u pcan leadtot he creation
of sparks, which coul dignite the highly explo- 224
Battery (vehicle)Breakdown assistance

sive gases of
abattery. There is arisk of an
explosion.
Before handling the battery, touch the vehicle body to remove any existing electrostatic
build-up.
The highly flammable gas mixture is created
while the battery is charging and when jump-
starting.
Always make sure that neither you nor the bat-
tery is electrostatically charged. Electrostatic
charge is created, for example:
R by wearing synthetic-fibre clothing
R by friction between clothing and the seat
R if you pull or push the battery across carpet or
other synthetic materials
R if you rub the battery with acloth G
WARNING
During the charging process, abattery produ-
ces hydrogen gas. If ashort circui toccurs or
sparks are created ,the hydrogen gas can
ignite. There is arisk of an explosion.
R Make sure that the positive terminal of a
connected battery does not come into con-
tact with vehicl eparts.
R Never place metal objects or tools on abat-
tery.
R It is important that you observe the descri-
bed order of the battery terminal swhen
connecting and disconnecting abattery.
R When jump-starting, make sure that the
battery pole swith identical polarity are
connected.
R It is particularl yimportant to observe the
described order when connecting and dis-
connecting the jump leads.
R Never connect or disconnect the battery
terminal swhile the engine is running. G
WARNING
Battery acid is caustic. There is arisk of injury.
Avoid contact with the skin, eyesorc lothing.
Do not breathe in any battery gases. Do not
leano ver the battery .Keep the batterie sout
of the reach of children. Immediately rinse off battery acid thoroughly with plenty of clean
wate
rand seek medical attention at once. H
Environmenta
lnote Batteries contain pollutants.
It is illegal to dispose of them
with th ehousehold rubbish.
The ym ustb ec ollected sep-
arately and disposed of in an environmentall yresponsible
recycling system. Dispose of batteries in an
environmentall
yresponsible
manner. Take discharged
batteries to aquali fied spe-
cialist workshop or to acol-
lectio npoint for used batter-
ies.
! Hav
ethe battery checked regularly at a
qualified specialis tworkshop.
Observe the servic eintervals in the Service
Bookle torcontact aquali fied specialis twork-
sho pfor mor einformation.
! Alway
shavew orkont he batteries carried
ou tata qualified specialis tworkshop.
Shoul dit, in exceptiona lcircumstances ,be
absolutely necessary to disconnect the 12-
vol tbattery yourself, please observe the fol-
lowing:
R Secure the vehicl etoprevent it fro mrolling
away
R Switch off the ignition
R Disconnect the negative termina lfirst and
the nthe positive terminal
The transmission is locked in position j
after disconnecting the battery.
After the work is completed ,securel yrefit the
battery and the positive termina lcover.
Compl ywiths afety precautions and take pro-
tective measures when handling batteries. Risk of explosion.
Fire
,naked flames and smoking are
prohibited whe nhandling the bat-
tery .Avoid creating sparks. Batter
y(vehicle)
225Breakdown assis tance Z

Battery aci
discaustic.
Avoid contact with the skin, eyes and clothing. Wea
reye protection. Keep children at
asafe distance. Observe this Owner's Manual.
For safety reasons, Mercedes-Benz recom-
mends that you use only batteries that have
been tested and approved for your vehicle by
Mercedes-Benz. These batteries provide
increased impact protection to prevent the vehi-
cle occupants from suffering acid burns should
the battery be damaged in the event of an acci- dent.
In order for the battery to achieve the maximumpossible service life, it should always be suffi-
ciently charged.
Like other batteries, the vehicle battery may
discharge over time if you do not use the vehicle.
In such cases, have the battery disconnected at aq uali fied specialist workshop .However, you
can also charge the battery with acharger rec-
ommended by Mercedes-Benz. For more infor-
mation, please contact aquali fied specialist
workshop.
Have the battery charge checked more fre-
quently if yo uuse the vehicle mainly for short
trips or if yo uleave it standing idl efor an exten-
ded period .Consul taq ualified specialist work-
shop if yo uwishtol eave your vehicle parked up
for along period of time.
Whe nyou park the vehicle, remove the key if you
do not require any electrica lconsumers. The
vehicle will then use very little energy, thus con- serving battery power.
i If the power supply has bee
ninterrupted,
e.g. du etoad ischarged battery, yo uwillh ave
to set the clock . Chargin
gthe battery
! Only use battery chargers wit
hamaximum
chargin gvoltage of 14.8 V. G
WARNING
During charging an djump-starting, explosive
gase scan escap efrom the battery .There is a
risk of an explosion.
Particularl yavoi dfire, naked flames, creating
sparks and smoking. Ensure there is sufficient
ventilation while charging and jump-starting.
Do not leano verabattery. G
WARNING
Battery acid is caustic. There is arisk of injury.
Avoid contact with the skin, eyesorc lothing.
Do not breathe in any battery gases. Do not
leano ver the battery .Keep the batterie sout
of the reach of children. Immediately rinse off
battery acid thoroughly with plenty of clean
water and seek medical attention at once. G
WARNING
Ad ischarged battery can freeze at tempera-
tures below freezing point. When jump-start-
ing the vehicl eorcharging the battery ,gases
can escap efrom the battery .There is arisk of
an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting.
! Only charge the battery using the jump-start
connection point.
The jump-starting connection point is in the
engine compartment (Y page227).
X Open the bonnet.
X Connect the battery charge rtothe positive
terminal and earth point in the same order as when connecting the donor battery in the
jump-starting procedure (Y page227).
Keep awayf rom fire and naked flames. Do not
leano ver the battery .Never charge the battery
if it is still fitted to the vehicle, unless you are
using abattery charge rthat has been tested and
approved by Mercedes-Benz. Abattery charger
unit speciallya dapted for Mercedes-Benz vehi-
cles and tested and approved by Mercedes-
Benz is available as an accessory. This device 226
Battery (vehicle)Breakdown assistance