Display messages
Possible causes/consequences and 0050 0050Solutions
0049
AUTO lights inoperative *T
he light sensor is faulty. The automatic driving lights are malfunc‐
tioning. #
Swit chthe light functions on/off manually (/page105). #
Consul t aqualified specialist workshop.
Intell. Light System inop-
erative *T
he Intelligent Light Sy stem is malfunctioning. The lighting sy stem
re mains available without the Intelligent Light Sy stem functions. #
Consult a qualified specialist workshop.
0049
Malfunction See Own-
er's Manual *T
heexterior lighting is malfunctioning. #
Consult a qualified specialist workshop. Wa
rning and indicator lamps Indicator and
warning lamps on the instru‐
ment clus ter Some sy
stems will per form a self-test when the
ignition is switched on. Some indicator and warn‐
ing lamps may briefly light up or flash. This
behaviour is non-c ritical. These indica tor and
wa rning lamps indicate a malfunction only if they
light up or flash af terth e engine has been star ted
or during a journe y. Saf
ety sy stems Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
0075
Re stra int sy stem warning
lamp *The
redwa rning lamp forth ere stra int sy stem is on while the engine
is running.
The restra int sy stem is malfunctioning. &
WARNING Risk of injury duetomalfunctions in there stra int
sy stem
Components in there stra int sy stem may be activated unintention‐
ally or not deploy as intended in an accident. #
Have there stra int sy stem checked and repaired immediately
at a qualified specialist workshop. #
Pay attention tothe display messages. #
Drive on carefull y. #
Have there stra int sy stem and its components checkedby aqu ali‐
fi ed specialist workshop immediately.
Fu rther information on there stra int sy stem and its components can
be found under "Occupant saf ety". 302
Display messages and warning and indicator lamps
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
004D
Brake sy stem warning
lamp *T
he red brake sy stem warning lamp is on while the engine is running.
EBD is not available due toa malfunction. As a result, BAS, hill start
assist and ESP ®
as well as their driving saf ety sy stems are not availa‐
ble.
AT TENTION ASSIST has been deactivated and additional driving sys‐
te ms may ha vebeen switched off automatically. &
WARNING Risk of skidding if EBD, ABS and ESP ®
are mal‐
functioning
The wheels may blo ckduring braking and ESP ®
does not per form
any vehicle stabilization.
The steerability and braking characteristics are heavily impaired
and the braking dis tance may increase. In addition, other driving
saf ety sy stems are switched off. #
Drive on carefull y. #
Have the brake sy stem checked immediately at a qualified
specialist workshop. #
Switch off the engine, wait a while and restart the engine. #
Check whe ther the display message has disappeared and ESP ®
is
operational.
If th e display message continues tobe displa yed: #
Drive on carefull y. #
Consult a qualified specialist workshop immediatel y.
004D Brake sy stem warning
lamp *The
red brake sy stem warning lamp is on while the engine is running.
A wa rning tone also sounds.
The brake forc e boosting is malfunctioning. &
WARNING Risk of accident and injury if brake forc e boosting
is malfunctioning
If brake forc e boosting is malfunctioning, increased brake pedal
fo rc e may be necessary for braking. The braking characteristics
may be impaired. The braking dis tance can increase in eme rgency
braking situations. #
Stop in a safe location immediately. Do not continue driving! #
Consult a qualified specialist workshop. #
Secure theve hicle against rolling away.
004D
Brake sy stem warning
lamp *T
he red brake sy stem warning lamp is on while the engine is running.
The reis insuf ficient 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. Display messages and
warning and indicator lamps 303
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions #
Stop theve hicle as soon as possible, paying attention to
ro ad and traf fic conditions. Do not continue driving. #
Consult a qualified specialist workshop. #
Do not top up the brake fluid. #
Secure theve hicle against rolling away.
0025
ABS warning lamp *T
he yellow ABS warning lamp is on while the engine is running.
ABS has been switched off due toa malfunction. As a result, BAS, hill
st art assist and ESP ®
as well as their driving saf ety sy stems ha vealso
been swit ched off.
AT TENTION ASSIST has been deactivated and additional driving sys‐
te ms may ha vebeen switched off automaticall y. &
WARNING Risk of skidding if ABS and ESP ®
are malfunction‐
ing
The wheels may blo ckduring braking and ESP ®
does not per form
any vehicle stabilization.
The steerability and braking characteristics are heavily impaired
and the braking dis tance may increase. In addition, other driving
saf ety sy stems are switched off. #
Drive on carefull y. #
Have ABS and ESP ®
ch ecked immediately at a qualified spe‐
cialist workshop. #
Switch off the engine, wait a while and restart the engine. #
Check whe ther the display message has disappeared and ESP ®
is
operational.
If th e display message continues tobe displa yed: #
Drive on carefull y. #
Consult a qualified specialist workshop immediatel y.
If th e ABS cont rol unit is defective, other sy stems may be available
only with restrictions or may be una vailable, e.g. the navigation sys‐
te m or the automatic transmission.
00E5 ESP ®
wa rning lamp *
The yellow ESP ®
wa rning lamp flashes while theve hicle is in motion.
ESP ®
or traction contro l intervenes because there is a risk of skidding
or at least one wheel is spinning.
Cruise contro l orActive Dis tance Assi stDISTRONIC has been au to‐
matical lyswitched off. #
When pulling away, accelerate only as much as is necessar y. #
Dep ress the accelerator pedal less during your journe y. #
Adapt your driving style to suit thero ad and weather conditions. #
Do not swit choff ESP ®
. 304
Display messages and warning and indicator lamps
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
In exc eptional cases, it may be better toswitch off
ESP ®
(/ page 154).
00E5 ESP ®
wa rning lamp *
The yellow ESP ®
wa rning lamp is on while the engine is running.
ESP ®
,BA S and hill start assist are una vailable due toa malfunction.
AT TENTION ASSIST is deactivated and other driving sy stems could be
automatically deactivated. &
WARNING Risk of skidding if ESP ®
is malfunctioning
If ESP ®
is malfunctioning, ESP ®
cannot car ryout vehicle stabilisa‐
tion. In addition, other driving saf ety sy stems are switched off. #
Drive on carefull y. #
Have ESP ®
ch ecked at a qualified specialist workshop. #
Pay attention tothe display messages. #
Drive on carefull y. #
Consult a qualified specialist workshop immediatel y.
00BB ESP ®
OFF warning lamp *
The yellow ESP ®
OFF warning lamp is on while the engine is running
or the ECO start- stop function is active.
ESP ®
has been switched off. &
WARNING Risk of skidding when driving with ESP®
deacti va‐
ted
ESP ®
does not act tostabilise theve hicle. The availability of fur‐
th er driving saf ety sy stems is also limited. #
Drive on carefull y. #
Deactivate ESP ®
only for as long as the situation requires.
If ESP ®
cannot be activated, ESP ®
is malfunctioning. #
Have ESP ®
ch ecked immediately at a qualified specialist
wo rkshop. #
Switch ESP ®
on again.
In exceptional cases, it may be better toswitch off
ESP ®
(/ page 154). #
Adapt your driving style to suit thero ad and weather conditions.
If ESP ®
cannot be swit ched on: #
Drive on carefull y. #
Have ESP ®
ch ecked at a qualified specialist workshop. Display messages and
warning and indicator lamps 305
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
0024
Indicator lamp for park‐
ing brake *The
red indicator lamp forth e parking brake flashes or is on and/or
th eye llow warning lamp forth e parking brake is on.
The parking brake is malfunctioning or the display sho wsan instruc‐
tion torelease the parking brake.
If only there d indicator lamp forth e parking brake lights up, the park‐
ing brake has been applied.
Pa y attention tothe display messages. Seat belt
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
00E9
Seat belt warning lamp *The
red seat belt warning lamp lights up or flashes af terth e engine
has star ted. A warning tone may also sound.
Fo r cer tain countries only: The red seat belt warning lamp lights up
fo r a maximum of six seconds af terth e ignition has been switched on.
The seat belt warning lamp reminds the driver and front passenger to
fa sten their seat belts. #
Fasten your seat belt (/ page 30).
00E9
Seat belt warning lamp *The
redwa rning lamp forth e seat belt lights up af terth e engine
st arts as soon as the driver's or front passenger door has been
closed.
The driver's or front passenger's seat belt is not fastened. #
Fasten your seat belt (/ page 30).
The warning lamp will go out.
In vehicles with automatic front passenger airbag deactivation, there
are objects on the front passenger seat. #
Take the objects off the front passenger seat and stowthem in a
we ll-secured place.
The warning lamp will go out.
00E9 Seat belt warning lamp *The
red seat belt warning lamp flashes and an intermit tent wa rning
to ne sounds.
The driver's or front passenger's seat belt is not fastened. You are
driving at a speed greater than 25 km/h or ha vebriefly exceeded
25 km/h. #
Fasten your seat belt (/ page 30).
The warning lamp and the intermittent warning tone will go out.
In vehicles with automatic front passenger airbag actuation, there are
objects on the front passenger seat. You are driving at a speed
grea terth an 25 km/h or ha vebrief lyexceeded 25 km/h. #
Take the objects off the front passenger seat and stowthem in a
we ll-secured place.
The warning lamp and the intermittent warning tone will go out. 306
Display messa ges and warning and indicator lamps
Driving sy
stems Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
00BA
Wa rning lamp for dis‐
ta nce warning function *The
red dis tance warning lamp lights up while theve hicle is in motion.
The dis tance totheve hicle in front is too small forth e selected
speed. #
Incre asethe dis tance totheve hicle in front.
00BA Wa rning lamp for dis‐
ta nce warning function *The
red dis tance warning lamp lights up while theve hicle is in motion.
A wa rning tone also sounds.
Yo u are approaching a vehicle or a stationary obs tacle on your antici‐
pated route at excessive speed. #
Beready toapply the brakes immediatel y. #
Pay careful attention tothe tra ffic situation. If necessar y,apply
th e brakes or avoid an obs tacle.
Yo u can find fur ther information about the dis tance warning function
in "Active Brake Assist" (/ page156). Ve
hicle Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
00CC
Po we rst eering sy stem
wa rning lamp *The
red po werst eering sy stem warning lamp is on while the engine is
ru nning. A warning tone also sounds.
The po wer assi stance forth esteering may be malfunctioning. Yo u
may need touse more forc eto steer. #
Carefully drive on toaqu alified specialist workshop and ha vethe
st eering checked immediatel y. Engine
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
00B9
Engine diagnostics warn‐
ing lamp *The
yellow engine diagnostics warning lamp is on while the engine is
ru nning.
The remay be a malfunction in thefo llowing vehicle sy stems:
R engine management
R injection
R exhaust sy stem
R ignition sy stem (in vehicles with a petrol engine)
R fuel sy stem
This can cause the emissions limit values tobe exc eeded and the
engine torun in eme rgency mode. #
Have theve hicle checked immediately at a qualified specialist
wo rkshop. Display messages and
warning and indicator lamps 307
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
00B4
Fu elreser ve wa rning
lamp *The
yellow fuel reser ve wa rning lamp is on while the engine is run‐
ning.
The fuel supp lyhas dropped into there ser verange.
Ope ration of the auxiliary heating (s tationary hea ter) is deactivated in
th ere ser verange. #
Refuel theve hicle.
00AC
Coolant warning lamp *
The red coolant warning lamp is on while the engine is running and
th e coolant temp erature display is at thest art of the scale.
The temp erature sensor forth e coolant temp erature display is defec‐
tive.
The coolant temp erature is no longer being monitored. If the coolant
is too hot, the engine may be damaged. #
Stop immediately in accordance with the traf fic conditions and
switch off the engine. Do not continue driving! #
Secure theve hicle against rolling away. #
Consult a qualified specialist workshop.
00AC
Coolant warning lamp *T
he red coolant warning lamp is on while the engine is running.
The coolant le vel is too lo w.
If th e coolant le vel is cor rect, the air supply tothera diator may be
impaired or thera diator's electric fan may be faulty.
The coolant is too hot and the engine is not being adequately cooled. #
Pay attention tothe display messages. #
Stop immediately in accordance with the traf fic conditions and
switch off the engine. #
Secure theve hicle against rolling away. #
Exit theve hicle and keep a safe dis tance from it until the engine
has cooled down. #
Check the coolant le vel and top up with coolant, complying with
th e instructions (/ page 225). #
Ifth e coolant has tobe topped up frequentl y,ha ve the engine
cooling sy stem checked at a qualified specialist workshop. #
Ensure that the air supply tothera diator is not impaired, e.g. by a
plastic bag that has been blown onto the grille. #
Monitor the coolant temp erature display on the instrument clus‐
te r. #
Do not restart the engine until the coolant temp erature is below
12 0°C. If you do, the engine may be damaged. #
Drive on tothe nearest qualified specialist workshop. Avoid high
engine loads, e.g. driving on hilly roads or stop-and-go driving.
00AC Coolant warning lamp *The
red coolant warning lamp is on while the engine is running. A
wa rning tone also sounds.
The coolant has exceeded thete mp erature of 120°C. The air supply
to thera diator may be impaired or the coolant le vel may be too lo w.
The engine has not been suf ficiently cooled and may be damaged. 308
Display messages and warning and indicator lamps
Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions &
WARNING Risk of burn s when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when
th ere is a fire inthe engine compartment, thefo llowing situations
may occur:
R You could come into con tact with hotgases.
R You could come into con tact with other hot, escaping operat‐
ing fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the
bonn etclosed and call thefire service. #
Pay attention tothe display messages. #
Stop immediately in accordance with the traf fic conditions and
switch off the engine. #
Secure theve hicle against rolling away. #
Exit theve hicle and keep a safe dis tance from it until the engine
has cooled down. #
Check the coolant le vel and top up with coolant, complying with
th e instructions (/ page 225). #
Ifth e coolant has tobe topped up frequentl y,ha ve the engine
cooling sy stem checked at a qualified specialist workshop. #
Ensure that the air supply tothera diator is not impaired, e.g. by a
plastic bag that has been blown onto the grille. #
Monitor the coolant temp erature display on the instrument clus‐
te r. #
Ifth e coolant temp erature is below 120°C, you can continue driv‐
ing tothe nearest qualified specialist workshop. #
Avoid high engine loads, e.g. driving on hilly roads or stop-and-go
driving. Ty
res Wa
rning/indicator
lamp Po
ssible causes/consequences and 0050 0050Solutions
0077
Ty re pressure monitoring
sy stem warning lamp *The
yellow tyre pressure monitoring sy stem warning lamp (pressure
loss/malfunction) is on.
The tyre pressure monitoring sy stem has de tected a loss of pressure
in at least one tyre. Display messages and
warning and indicator lamps 309