
cases, oil of
the type in the engine is not availa‐
ble, use ano ther appr oved mineral or synthetic
engine oil.
Ve hicles with a diesel engine: ifth e grade is
not available, you may also refill with engine oils
acco rding toMB-F reigabe or MB-Appr oval 228.5,
229.3 or 229.5. The top-up quantity is then limi‐
te dto maximum 1.1 US qt (1.0 liter).
Yo u must then ha vean oil change car ried out at
th e earliest possible opportunit y.
Ve hicles with a gasoline engine: ifth e grade is
not available, you may refill with engine oils
acco rding toMB-F reigabe or MB-Appr oval 229.3
or AC EA A3/B4. The top-up quantity is then limi‐
te dto maximum 1.1 US qt (1.0 liter).
Yo u must then ha vean oil change car ried out at
th e earliest possible opportunit y.
Engine oils are di stinguished by:
R engine oil brand
R grade (MB-F reigabe or MB-Appr oval)
R SAE classi fication (viscosity)
Oil change inter val
The on-board computer automatically sho wsthe
date of the next oil change as an event messa ge
on the displa y.
Mercedes-Benz recommends having the oil
ch anged at a qualified specialist workshop.
Engine oil capacities Engine
Engine oil
M2 74 around11.2 qt
(10.5 li ters)
OM642 around13.2 qt
(12.5 li ters)
OM651 (rear wheel
drive) around
12qt
(1 1. 5 liters) Information on oil consum
ption
Depending on the driving style, theve hicle con‐
sumes a maximum of 1.1 US qt (1.0 liter) of
engine oil per 620 miles (1000 km).
In thefo llowing cases, oil consum ption may also
exc eed this limit:
R theve hicle is ne w.
R you use theve hicle mostly under arduous
conditions.
R you drive frequently at a high engine speed. Re
gular maintenance is a prerequisite forfa vo ra‐
ble consum ption figures. You can on lyassess the
oil consum ption af ter a long journe y.Check the
oil le vel in the engine regularly, e.g. weekly or
ev ery time youre fuel. Note
s on brake fluid Obser
vethe no tes on operating fluids
(/ page 263). &
WARNING Risk of an accident due to
va por poc kets form ing in the brake sys‐
tem
The brake fluid con stantly absorbs moisture
from the air. This lo wersthe boiling point of
th e brake fluid. If the boiling point is too lo w,
va por poc kets may form inthe brake sy stem
when the brakes are applied hard.
This causes the braking ef fect to be impaired. #
Have the brake fluid rene we d at the
specified inter vals. *
NO
TEDama getopaint, plastic or rubber
by brake fluid There is a
risk of damage toproperty if brake
fl uid comes into con tact wi thpaint, plastic or
ru bber. #
If paint, plastic or rubber comes into
con tact wi thbrake fluid, rinse wi th
wate r immediatel y. Obser
vethe no tes on paintwork/matte finish
paintwork care (/ page 211).
Ha ve the brake fluid replaced regular lyat a quali‐
fi ed specialist workshop.
Only use brake fluid appr ovedby Mercedes-Benz
in accordance with MB-F reigabe or MB-Appr oval
33 1.0.
Fu rther information on brake fluid:
R inthe MB Specifications for operating fluids
at http://be vo.mercedes-benz.com
R at a qualified specialist workshop Coolant
Note
s on coolant
Obser vethe no tes on operating fluids
(/ page 263). Te
ch nical da ta269

Display messages
Possible causes/consequences and 0050 0050Solutions &
WARNING Risk of accident if the electrical parking brake
has insuf ficient holding force
If th e electrical parking brake does not ha vesuf ficient holding
fo rc e on a steep incline, theve hicle may rollaw ay. #
Park theve hicle on a le vel sur face only and secu reit
against rolling away. #
Shift the automatic transmission toposition 005D. Obser
vethe no tes on parking theve hicle (/ page132).
0024
Parking Brake See Oper-
ator's Manual *T
he on-board voltage is low or a malfunction has occur red in the
sy stem; the closing forc e may not be suf ficient forth e incline. &
WARNING Risk of an accident due toa brake sy stem mal‐
function
If th e brake sy stem is malfunctioning, braking characteristics
may be impaired. #
Drive on carefull y. #
Have the brake sy stem checked immediately at a qualified
specialist workshop. #
Park theve hicle on a le vel sur face only and secu reit against
ro lling away. #
Vehicles with automatic transmission: shiftthe transmission
to position 005D. #
Have the brake sy stem checked at a qualified specialist work‐
shop immediatel y.
Check Brake Pads See
Operator's Manual *T
he brake pads ha vereached their wear limit. &
WARNING Risk of accident due torestricted braking po wer
When the brake pads ha vereached their wear limit, the braking
po we r may be restricted. #
Drive on carefully. #
Have the brake sy stem checked immediately at a qualified
specialist workshop. #
Visit a qualified specialist workshop.
004D
Check Brake Fluid Level *T
here is not enough brake fluid in the brake fluid reser voir. &
WARNING Risk of an accident due tolow brake fluid le vel
If th e brake fluid le vel is too lo w,the braking ef fect and the brak‐
ing characteristics may be impaired. #
Pull over and stop theve hicle safely as soon as possible,
paying attention toroad and traf fic conditions. Do not con‐
tinue driving under any circums tances. #
Consult a qualified specialist workshop. #
Do not add brake fluid. Display messages and
warning and indicator lamps 279

Display messages
Possible causes/consequences and 0050 0050Solutions
Active Lane Keeping
Assist Camera View
Restricted See Opera-
tor's Manual Po
ssible causes:
R dirt on the windshield in the camera's field of vision
R heavy precipitation or fog
Driving sy stems and driving saf ety sy stems may be malfunctioning
or temp orarily una vailable.
When the causes ha vebeen eliminated, the driving sy stems and
driving saf ety sy stems will be available again.
If th e display message does not disappear: #
Stop in a safe location. #
Clean the windshield.
Active Lane Keeping
Assist Inoperative *A
ctive Lane Keeping Assist is malfunctioning (/ page155). #
Visit a qualified specialist workshop.
Active Lane Keeping
Assist Currently Unavail-
able See Operator's Man-
ual *A
ctive Lane Keeping Assist is temp orarily una vailable (/ page155).
The ambie nt conditions are outside the sy stem limits (/ page155). #
Continue driving.
When the ambient conditions are within the sy stem limits, the
sy stem will be available again.
If th e display message does not disappear: #
Stop in a safe location. #
Clean the windshield.
00AD
ATTENTION ASSIST Inop-
erative *T
heATTENTION ASSIST is malfunctioning. #
Visit a qualified specialist workshop.
00AD
ATTENTION ASSIST:
Take a Break! *T
heATTENTION ASSIST has de tected fatigue or increasing inatten‐
tiveness on the driver's part (/ page151). #
Ifnecessa ry,ta ke a break. Engine
Displ
aymessages
Possible causes/consequences and 0050 0050Solutions
00D4
Fuel Level Low *T
he fuel supplies ha vereached there ser veleve l. #
Refuel.
009E
Replace Air Filter *
Ve hicles with a diesel engine: The engine airfilter is clogged and
must be replaced. #
Visit a qualified specialist workshop. Display messages and
warning and indicator lamps 285

Display messages
Possible causes/consequences and 0050 0050Solutions #
Stop in a safe location immediately and switch off the engine. #
Consult a qualified specialist workshop.
00AC
Coolant Too Hot Stop
Vehicle Turn Engine Off *T
he coolant is too hot. #
Stop in a safe location immediately and switch off the engine. &
WARNING Danger of bu rns when opening the hood
If yo u open the hood when the engine has overheated or during
a fire inthe engine compartment, you could come into con tact
wi th hot gases or other escaping operating fluids. #
Before opening the hood, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the
hood closed and call thefire service. &
WARNING Risk of scalding from hot coolant
The engine cooling sy stem is pressurized, particularly when the
engine is warm. If you open the cap, you could be scalded byhot
coolant spr aying out. #
Let the engine cool down before opening the cap. #
When opening the cap, wear pr otective glove s and saf ety
gl asses. #
Open the cap slowly torelease pressure. #
Wait until the engine has cooled down. #
Ensure that the air supply tothe engine radiator is not obstruc‐
te d.
00AC Check Coolant Level See
Operator's Manual *T
he coolant le vel is too lo w. &
WARNING Risk of scalding from hot coolant
The engine cooling sy stem is pressurized, particularly when the
engine is warm. If you open the cap, you could be scalded byhot
coolant spr aying out. #
Let the engine cool down before opening the cap. #
When opening the cap, wear pr otective glove s and saf ety
gl asses. #
Open the cap slowly torelease pressure. *
NO
TEEngine damage due toinsuf ficient coolant #
Avoid long journe yswith insuf ficient coolant. #
Top up coolant (/ page 206).
Regeneration not possi-
ble *N
otall conditions ha vebeen met forre ge neration of the diesel par‐
ticulate filter . #
Continue driving as normal until all conditions ha vebeen met for
re ge neration of the diesel particulate filter. 288
Display messages and warning and indicator lamps

Display messages
Possible causes/consequences and 0050 0050Solutions
XXX See Operator's Man-
ual The
exhaust gas af tertre atment sy stem is defective or an emissions-
re leva nt malfunction has occu rred. This malfunction or defect can
damage theex haust gas af tertre atment sy stem.
Af terth e message appears forth efirs t time, the engine can only be
st ar ted ano ther 10 times. The number of remaining engine starts XX
(10 to1) is shown in the message everytime the engine is star ted. #
Visit a qualified specialist workshop immediately.
0099 Additive System Fault
Emergency Op.: XXX
mph See Operator's
Manual *
In addition, theye llow 00B9 Check Engine warning lamp on the
instrument clus ter lights up and a warning tone sounds.
Yo u can only drive theve hicle at a maximum speed of 5 mph
(8 km/h). #
Visit a qualified specialist workshop immediately. Ti
res Display messages
Possible causes/consequences and 0050 0050Solutions
Tire Pressure Monitor
Inoperative No Wheel
Sensors *T
he ins talled wheels do not ha vesuitable tire pressure sensors. The
tire pressure monitor has been switched off. #
Install wheels with suitable tire pressure sensors.
0077
Tire Press. Sen. Missing *T
he tire pressure sensor signal is missing from one or more tires.
No pressure value is displa yedfo rth e tire in question. #
Have thefa ulty tire pressure sensor replaced at a qualified spe‐
cialist workshop.
Tire Press. Monitor Cur-
rently Unavailable *T
here is inter fere nce from a po werful source of radio wav es As a
re sult, no signals from the tire pressure sensors are received. The
tire pressure monitor is temp orarily una vailable. #
Continue driving.
As soon as the cause has been eliminated, the tire pressure
monitor automatically switches on.
0077 Warning Tire Malfunction *T
he pressure in one or more tires suddenly falls. The wheel position
is shown. &
WARNING Risk of an accident from driving wi thaflat tire
Flat tires are dangerous in thefo llowing ways:
R The tires can overheat and cause a fire.
R The driving characteristics, as well as steering and braking,
may be greatly impaired.
Yo u could then lose cont rol of theve hicle. #
Do not drive with a flat tire. #
Obse rveth e no tes on flat tires. In
fo rm ation about flat tires (/ page218). #
Stop theve hicle in accordance with the tra ffic conditions. 290
Display messages and warning and indicator lamps

Display messages
Possible causes/consequences and 0050 0050Solutions #
Check the tires.
0077 Check Tires *T
he pressure in one or more tires has fallen significantl y.The wheel
position is shown. &
WARNING Risk of an accident due toinsuf ficient tire pres‐
sure
Ti re pressures that are too low pose thefo llowing hazards:
R The tires may bur st, especially as the load and vehicle speed
increase.
R The tires may wearexc essively and/or une venly, which may
greatly impair tire traction.
R The driving characteristics, as well as steering and braking,
may be greatly impaired.
Yo u could then lose cont rol of theve hicle. #
Obser vethere commended tire pressu re. #
Adjust the tire pressure if necessar y. #
Stop in accordance with the tra ffic conditions. #
Check the tire pressure (/ page 234) andthe tires.
0077 Please Correct Tire Pres-
sure *T
he pressure in at least one tire is too low or the pressures of the
individual tires deviate too much from each other. #
Check the tire pressure, and add air if necessar y. #
When the tire pressure has been set cor rectl y,re-sta rt the tire
pressure monitor (/ page240).
Tire Pressure Monitor
Inoperative *T
he tire pressure monitor is malfunctioning. #
Visit a qualified specialist workshop. Key
Display messages
Possible causes/consequences and 0050 0050Solutions
00AF
Don't Forget Your Key *T
his message reminds you not tolea veyour key in theve hicle. #
Take theke y with you when youget out of theve hicle.
00AF Place the Key in the
Marked Space See Oper-
ator's Manual *K
eydetection is malfunctioning. #
Change theke y's position in theve hicle. #
Start theve hicle with theke y in the slot(/ page104).
00AF *T
hekey is not de tected and may no longer be in theve hicle.
The key is no lon ger in theve hicle and you swit chthe engine off:
R You can no lon gerst art the engine. Display messages and
warning and indicator lamps 291

Display messages
Possible causes/consequences and 0050 0050Solutions
003B
Inoperative See Opera-
tor’s Manual *S
tationary heating is temp orarily malfunctioning. #
When theve hicle is at a standstill in a horizontal position and
th e engine has cooled down: try toswitch on thest ationary
heating four times, leaving a gap of se veral minutes between
each attem pt. #
Ifth est ationary heating does not swit chon: visit a qualified spe‐
cialist workshop.
003B Inoperative Refuel Vehi-
cle *T
here is too little fuel in the fuel tank.The stationary heating cannot
be swit ched on. #
Refuel theve hicle.
003B
Inoperative Battery Low *T
he on-board voltage is too lo w.
The stationary heating has swit ched off. #
Drive an extended di stance until the battery has been suf fi‐
ciently charge d again.
00CC
Steering Malfunction
Increased Physical Effort
See Operator's Manual *T
hesteering po wer assi stance is malfunctioning. &
WARNING Risk of an accident due toaltered steering char‐
acteristics
If th e po wer assi stance of thesteering fails partially or com‐
ple tely,yo u will need touse more forc eto steer. #
If safe steering is possible, drive on carefully. #
Visit or consult a qualified specialist workshop immedi‐
atel y. #
If safe steering is possible, drive on carefully. #
Visit or consult a qualified specialist workshop immediately.
00CC
Steering Malfunction
Stop Immediately See
Operator's Manual *T
hesteering is malfunctioning. Steerability is heavily impaired. &
WARNING Risk of accident if steering capability is impaired
If th esteering does not function as intended, theve hicle's oper‐
ating saf ety is jeopardized. #
Pull over and stop theve hicle safely as soon as possible,
paying attention toroad and traf fic conditions. Do not con‐
tinue driving under any circums tances. #
Consult a qualified specialist workshop. #
Stop in a safe location immediately. Do not continue driving. #
Consult a qualified specialist workshop.
Shift to 'P' or 'N' to Start
Engine *
Yo u ha veattem pted tostart the engine in transmission position 005B
or 005E. #
Shift the transmission toposition 005Dor005C.
* Yo u ha vetried toshift from position 005Bor005C toposition 005E. #
Press the brake pedal. Display messages and
warning and indicator lamps 293

Display messages
Possible causes/consequences and 0050 0050Solutions
To Engage Transmiss.
Position R First Depress
the Brake #
Shift the transmission toposition 005E.
Air Conditioning Malfunc-
tion See Operator's Man-
ual *T
he climate contro l system is functional, subject totemp orary
re strictions. The air quantity and fresh air supply are controlled
automaticall y. #
Have the climate cont rol sy stem checked at a qualified specialist
wo rkshop.
Auxiliary Battery Mal-
function *T
he bac kup battery forth e transmission is not being charge d. #
Visit a qualified specialist workshop. #
Until then, alw ays shift the transmission toposition 005Dmanually
before you swit choff the engine. #
Before leaving theve hicle, apply the parking brake.
Reversing Not Possible
Service Required *T
he transmission is malfunctioning. It is no longer possible toshift
to reve rsege ar. #
Visit a qualified specialist workshop.
Transmission Malfunc-
tion Stop *T
he transmission is malfunctioning. The transmission automatically
shifts toposition 005C. #
Stop in a safe location immediately. #
Shift the transmission toposition 005D. #
Consult a qualified specialist workshop.
0072
Vehicle Operational
Switch the Ignition Off
Before Exiting *Y
ou are about toexitth eve hicle while it is ready tostart. #
When youex itth eve hicle, switch off the ignition and take the
ke y with you. #
Ifyo u do not exitth eve hicle, switch off the electrical consum‐
ers, e.g. the seat heating. Otherwise, the12 ‑Volt‑battery may
discha rge and theve hicle can only be star ted using a boos ter
battery (jump start).
Service Required Do Not
Shift Gears Visit Dealer *T
he transmission is malfunctioning. The transmission position can
no longer be changed. #
Ifth e transmission is in position 005B, visit aqualified specialist
wo rkshop, without changing the transmission position. #
For all other transmission positions, park theve hicle in a safe
location. #
Inform a qualified specialist workshop or the breakdown service.
Only Shift to 'P' when
Vehicle is Stationary *
The transmission can only be brought into position 005Difth eve hicle
is at a standstill.
N Permanently Active
Risk of Rolling Away *W
hile theve hicle is rolling or driving, the transmission was shif ted
to position 005C. #
Tostop, press the brake pedal and, when theve hicle is at a
st andstill, shift the transmission toposition 005D. #
Tocontinue driving, shi ftthe transmission toposition 005Bor005E. 294
Display messages and warning and indicator lamps