check engine MERCEDES-BENZ GLA SUV 2017 Owner's Manual

Observe the following notes:
R Stop the vehicle before driving off-road. If
necessary, activate the off-road program
(Y page 151).
R To avoid damaging the vehicle, make sure
there is always sufficient ground clearance.
R Make sure that items of luggage and loads are
stowed safely and are well secured
(Y page 293).
R Always keep the engine running and in gear
when driving on a downhill gradient. Activate
DSR (Y page 190).
R Drive slowly and evenly, if necessary at walk-
ing pace.
R Ensure that the wheels are in contact with the
ground at all times.
R Drive with extreme care on unknown off-road
routes where visibility is poor. For safety rea-
sons, get out of the vehicle first and survey
the off-road route.
R Check the depth of water before fording rivers
and streams.
R Watch out for obstacles.
R Take care when turning on an uphill or down-
hill slope or when driving across a slope. The
vehicle could otherwise tip over.
R Always keep the side windows and the pano-
rama sliding sunroof closed during the jour-
ney.
R Do not deviate from marked routes.
R Do not use the HOLD function when driving
off-road, on steep uphill or downhill gradients
or on slippery or loose surfaces. The HOLD
function cannot hold the vehicle on such sur- faces.
Checklist before off-road driving X
Engine oil level: check the engine oil and top
it up if necessary.
When driving on steep gradients, the oil level must be sufficiently high to ensure a correct
oil supply in the vehicle.
X Wheels and tyres: check the tyre tread
depth and tyre pressure.
X Check for damage and remove any foreign
objects, e.g. small stones, from the wheels/
tyres.
X Replace any missing valve caps. X
Replace dented or damaged wheels.
X Wheels: dented or bent wheels can lead to a
loss of tyre pressure and damage to the tyre
bead. Before driving off-road, check the
wheels and replace them if necessary.
Checklist after off-road driving !
If you detect damage to the vehicle after
driving off-road, have the vehicle checked
immediately at a qualified specialist work-
shop.
X Deactivate the off-road program
(Y page 151).
X Deactivate DSR (Y page 190).
X Clean the headlamps and rear lights and
check for damage.
X Clean the front and rear licence plates.
X Clean the wheels and tyres with a water jet
and remove any foreign objects.
X Clean the wheels, wheel arches and the vehi-
cle underside with a water jet; check for any
foreign objects and damage.
X Check whether twigs or other parts of plants
have become trapped. These increase the risk
of fire and can damage fuel pipes, brake
hoses or the air bellows of the axle joints and propeller shafts.
X After the trip, examine without fail the entire
undercarriage, wheels, tyres, brakes, body-
work structure, steering, chassis and exhaust
system for damage.
X After driving in sand, mud, gravel, water or
similar dirty conditions, have the following
checked and cleaned:
R brake discs
R wheels
R brake pads
R axle joints
X If you detect strong vibrations after driving
off-road, check for foreign objects in the
wheels and drive train and remove them if
necessary. Foreign objects can disturb the
balance and cause vibrations.
Driving over poor road surfaces places greater
demands on your vehicle than driving on normal roads. After driving off-road, check the vehicle.
This allows you to detect damage promptly and
reduce the risk of an accident to yourself and
other road users. 174
Driving tipsDriving and parking

Driving on sand
Observe the following rules when driving on
sand:
R Activate the off-road program (Y page 151).
R Avoid high engine speeds.
R Use the left-hand steering wheel gearshift
paddle to shift to a lower gear appropriate to
the terrain.
R Drive quickly to overcome the rolling resist-
ance. Otherwise, the vehicle could dig itself
into the sand.
R Drive in the tracks of other vehicles if possi-
ble. Make sure that:
- the tyre ruts are not too deep
- the sand is firm enough
- your vehicle has sufficient ground clear-
ance
Tyre ruts and unpaved roads !
Check that the ruts are not too deep and
that your vehicle has sufficient clearance.
Otherwise, your vehicle could be damaged or bottom out and get stuck.
Observe the following rules when driving along
ruts in off-road terrain or on roads with loose
gravel: R Activate the off-road program (Y page 151).
R Avoid high engine speeds.
R Shift to a lower gear using the left-hand steer-
ing wheel gearshift paddle.
R Drive slowly.
R Where ruts are too deep, drive with the
wheels on one side on the middle section of
turf if possible. Travelling uphill
Approach/departure angle G
WARNING
If you drive on a steep incline at an angle or
turn on a steep incline, the vehicle could slip
sideways, tip and overturn. There is a risk of
an accident.
When driving on an incline, drive into the line of fall (upwards or downwards in a straight
line) and do not turn. R
Observe the warnings for off-road driving
(Y page 173).
R Follow the line of fall when driving on slopes
and steep inclines.
R Before driving on extreme uphill and extreme
downhill gradients, select the off-road pro-
gram (Y page 151).
R Drive slowly.
R Accelerate gently and make sure that the
wheels are gripping.
R Avoid high engine speeds, except when driv-
ing on sandy and muddy routes with high driv-
ing resistance.
R Use the left-hand steering wheel gearshift
paddle to shift to a lower gear appropriate to
the gradient.
R Use the left-hand gearshift paddle to shift to a
lower gear on long and steep downhill gradi-
ents.
Hill start assist will aid you when pulling away on
a hill. Further information on hill start assist
(Y page 147).
Do not shift into transmission position iwhen
driving off-road. You could lose control of the
vehicle if you attempt to brake the vehicle using
the service brake. If the gradient is too steep for your vehicle, back up in reverse gear.
Always observe the approach/departure angle
values (Y page 359).
Maximum gradient-climbing capability Always observe the maximum gradient climbing
ability values (Y page 359).
Hilltops When driving up an uphill gradient, slightly
reduce pressure on the accelerator immediately
before reaching the brow of the hill. Make use of the vehicle's own impetus to travel over the
brow.
This style of driving prevents:
R the vehicle from lifting off the ground on the
brow of a hill
R the vehicle from travelling too quickly down
the other side Driving tips
175Driving and pa rking Z

Driving downhill
R
Drive slowly.
R Do not drive at an angle down steep inclines.
Steer into the line of fall and drive with the
front wheels aligned straight forwards. Oth-
erwise, the vehicle could slip sideways, tip
and overturn.
R Before tackling steep downhill gradients, use
the left-hand steering wheel gearshift paddle
to shift to a lower gear.
R Activate DSR. If this is not sufficient, brake
gently. When doing so, make sure that the
vehicle is facing in the direction of the line of fall.
R Check that the brakes are working normally
after a long downhill stretch.
Off-road ABS is activated when the off-road pro- gram is selected.
At speeds below 30 km/h the front wheels lock
cyclically during braking. The digging-in effect
achieved in the process reduces the stopping
distance during off-road driving. The steerability of the vehicle is considerably reduced if the
wheels lock. Driving systems
Cruise control
General notes Cruise control maintains a constant road speed
for you. It brakes automatically in order to avoid
exceeding the set speed. You must select a
lower gear in good time on long and steep down-
hill gradients, especially if the vehicle is laden or towing a trailer. For vehicles with automatic
transmission, you need to shift manually using
the steering wheel gearshift paddles. By doing
so, you will make use of the braking effect of the engine. This relieves the load on the brake sys-
tem and prevents the brakes from overheating
and wearing too quickly.
When the engine is running, you can use the
cruise control lever to limit the speed to any
speed between 30 km/h and the maximum
design speed of the vehicle. If the set value of
the permanent limiter is lower, then this value
applies (Y page 180).
Use cruise control only if road and traffic con-
ditions are appropriate for maintaining a steady speed for a prolonged period. The speed indicated in the speedometer may
differ slightly from the speed stored.
Important safety notes If you fail to adapt your driving style, cruise con-
trol can neither reduce the risk of an accident
nor override the laws of physics. Cruise control
cannot take into account road, weather or traffic conditions. Cruise control is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time
and for staying in lane.
Do not use cruise control:
R in road and traffic conditions that do not allow
you to maintain a constant speed, e.g. in
heavy traffic or on winding roads.
R on icy or slippery roads. Braking or acceler-
ating can cause the drive wheels to lose trac-
tion and the vehicle could then skid.
R in poor visibility, e.g. due to fog, heavy rain or
snow.
If a new driver takes over, advise the new driver
of the speed stored.
Cruise control lever :
To activate or increase speed
; LIM indicator lamp
= To activate at the current speed/last stored
speed
? To activate or reduce speed
A To switch between cruise control and the
variable speed limiter
B To deactivate cruise control
You can operate cruise control and the variable
speed limiter with the cruise control lever. 176
Driving syste
msDriving and parking

The LIM indicator lamp on the cruise control
lever indicates which system you have selected:
R LIM indicator lamp off: cruise control is
selected
R LIM indicator lamp on: variable limiter is
selected
When you activate cruise control, the stored
speed is shown in the multifunction display for
five seconds.
Selecting cruise control X
To select cruise control: check whether LIM
indicator lamp ;is on or off.
If it is off, cruise control is already selected.
X If it is not, press the cruise control lever in the
direction of arrow A.
LIM indicator lamp ;in the cruise control
lever goes out. Cruise control is selected.
Activation conditions To activate cruise control, all of the following
activation conditions must be fulfilled:
R the electric parking brake must be released
R you are driving faster than 30 km/h
R ESP ®
must be switched on, but not interven-
ing
R cruise control must be selected
Storing, maintaining and calling up a
speed Storing and maintaining the current
speed
You can store the current speed if you are driv-
ing faster than 30 km/h. X Accelerate the vehicle to the desired speed.
X Briefly press the cruise control lever up :or
down ?.
X Remove your foot from the accelerator pedal.
Cruise control is activated. The vehicle auto-
matically maintains the speed.
i Cruise control may be unable to maintain
the stored speed on uphill gradients. The
stored speed is resumed when the gradient
evens out. Cruise control maintains the
stored speed on downhill gradients by auto-
matically braking the vehicle. i
Vehicles with manual transmission:
R always drive at adequate, but not exces-
sive, engine speeds.
R change gear in good time.
R if possible, do not change down several
gears at a time.
Storing the current speed or re-calling the last stored speed G
WARNING
If you call up a stored speed and this is dif-
ferent from the current speed, the vehicle
accelerates or brakes. If you do not know
what the stored speed is, the vehicle may
accelerate or brake unexpectedly. There is a
risk of an accident.
Take the traffic conditions into account
before calling up the stored speed. If you do
not know what the stored speed is, store the
desired speed again.
X Briefly pull the cruise control lever towards
you =.
X Remove your foot from the accelerator pedal.
The first time cruise control is activated, it
stores the current speed or regulates the
speed of the vehicle to the previously stored
speed.
Setting a speed Bear in mind that it may take a brief moment
until the vehicle has accelerated or braked to
the set speed.
X To adjust the set speed in 10 km/h incre-
ments: briefly press the cruise control lever
up : beyond the pressure point for a higher
speed, or down ;for a lower speed.
or
X Keep the cruise control lever pressed beyond
the pressure point until the desired speed is
set. Press the cruise control lever up :for a
higher speed or down ;for a lower speed.
X To adjust the set speed in 1 km/h incre-
ments:
briefly press the cruise control lever
up : to the pressure point for a higher speed
or down ;for a lower speed.
or
X Keep the cruise control lever pressed to the
pressure point until the desired speed is set. Driving systems
177Driving and parking Z

?
To activate or reduce speed
A To switch between cruise control and the
variable speed limiter
B To switch off the speed limiter
With the cruise control lever, you can operate
cruise control or Distance Pilot DISTRONIC and
the variable speed limiter.
The LIM indicator lamp on the cruise control
lever indicates which system you have selected:
R LIM indicator lamp off: cruise control or Dis-
tance Pilot DISTRONIC is selected.
R LIM indicator lamp on: variable speed lim-
iter is selected.
When the engine is running, you can use the
cruise control lever to limit the speed to any
speed between 30 km/h and the maximum
design speed of the vehicle. If the set value of
the permanent limiter is lower, then this value
applies (Y page 180).
Selecting the variable speed limiter
X Check whether LIM indicator lamp ;is on.
If it is on, the variable speed limiter is already
selected.
If it is not, press the cruise control lever in the direction of arrow A.
LIM indicator lamp ;in the cruise control
lever lights up. The variable limiter is selected.
Storing the current speed You can use the cruise control lever to limit the
speed to any speed above 30 km/h while the
engine is running.
X Briefly press the cruise control lever up :or
down ?.
The current speed is stored and shown in the multifunction display.
Storing or calling up the speed G
WARNING
If you call up the stored speed and it is lower
than the current speed, the vehicle deceler-
ates. If you do not know the stored speed, the vehicle could decelerate unexpectedly. There
is a risk of an accident.
Pay attention to the road and traffic condi-
tions before calling up the stored speed. If you do not know the stored speed, store the
desired speed again. X
Briefly pull the cruise control lever towards
you =.
Setting a speed
X To adjust the set speed in 10 km/h incre-
ments: briefly press the cruise control lever
up : beyond the pressure point for a higher
speed, or down ?for a lower speed.
or X Keep the cruise control lever pressed beyond
the pressure point until the desired speed is
set. Press the cruise control lever up :for a
higher speed or down ?for a lower speed.
X To adjust the set speed in 1 km/h incre-
ments:
briefly press the cruise control lever
up : to the pressure point for a higher speed
or down ?for a lower speed.
or X Keep the cruise control lever pressed to the
pressure point until the desired speed is set.
Press the cruise control lever up :for a
higher speed or down ?for a lower speed.
Switching the speed limiter to passive
If you depress the accelerator pedal beyond the pressure point (kickdown), the limiter is
switched to passive mode. The Limiter pas‐
Limiter pas‐
sive sive message appears in the multifunction dis-
play.
You can then exceed the stored speed. The lim-
iter is activated again if, without kickdown, you:
R drive more slowly than the stored speed
R set a new speed or
R call up the last speed stored again
The Limiter passive
Limiter passive message in the multi-
function display disappears.
Switching off the variable speed limiter You cannot switch the variable speed limiter offby braking.
There are several ways to deactivate the varia-
ble speed limiter:
X Briefly press the cruise control lever forwards
B.
or
X Briefly press the cruise control lever in the
direction of arrow A.
LIM indicator lamp ;in the cruise control
lever goes out. The variable speed limiter is
switched off. Driving systems
179Driving and parking Z

Due to the nature of the system:
R warnings may be issued in error when driving
close to crash barriers or similar solid boun-
daries
R warnings may be interrupted when you are
driving alongside particularly long vehicles,
such as lorries, for a prolonged time
Warning display :
Warning display
Blind Spot Assist is not active at speeds below
approximately 30 km/h. Vehicles in the moni-
toring range are then not indicated.
If Blind Spot Assist is activated, indicator
lamp :in the exterior mirrors lights up yellow
up to a speed of 30 km/h. At speeds above
30 km/h, the indicator lamp goes out and Blind
Spot Assist is operational.
If a vehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
30 km/h, warning lamp :on the correspond-
ing side lights up red. This warning always
occurs when a vehicle enters the blind spot
monitoring range from behind or from the side.
When you overtake a vehicle, the warning only
occurs if the difference in speed is less than
12 km/h.
The yellow indicator lamp goes out if reverse
gear is engaged. Blind Spot Assist is then deac- tivated.
The brightness of the indicator/warning lamps
is adjusted automatically according to the ambi-
ent light.
Collision warning
If a vehicle is detected in the blind spot moni-
toring range and you switch on the correspond-
ing turn signal, a double warning tone sounds.
Red warning lamp :flashes. If the turn signal
remains on, detected vehicles are indicated by the flashing of red warning lamp
:. There are
no further warning tones.
Activating Blind Spot Assist X Make sure that Blind Spot Assist is activated
in the on-board computer (Y page 227).
X Turn the key to position 2in the ignition
lock.
Warning lamps :in the exterior mirrors light
up red for approximately 1.5 second s and
then turn yellow.
Towing a trailer
If you couple up a trailer, make sure that you
have correctly established the electrical con-
nection. This can be accomplished by checking
the trailer lighting. Blind Spot Assist is then
deactivated. The indicator lamps in the exterior
mirrors light up yellow and the Blind Spot
Blind Spot
Assist not available when towing a Assist not available when towing a
trailer See Owner's Manual trailer See Owner's Manual message
appears in the multifunction display.
i You can deactivate the indicator lamps in
the exterior mirrors.
To do so, you will need to deactivate Blind
Spot Assist if:
R the key is in position 2in the ignition lock
R the engine is not running
R the electrical connection to the trailer has
been established
Lane Keeping Assist General notes
Lane Keeping Assist monitors the area in front of
your vehicle by means of multifunction cam-
era :attached at the top of the windscreen.
Lane Keeping Assist detects lane markings on 210
Driving systemsDriving an
d parking

The warning vibration occurs earlier in the fol-
lowing situations if:
R you approach the outer lane marking on a
bend
R the road has very wide lanes, e.g. a motorway
R the system detects solid lane markings
The warning vibration occurs later in the follow-
ing situations if:
R the road has narrow lanes
R you cut the corner on a bend Towing a trailer
Important safety notes
G
WARNING
You could lose control of the vehicle/trailer
combination if it begins to swerve. The vehi-
cle/trailer combination could even overturn.
There is a risk of an accident.
On no account should you attempt to
straighten out the vehicle/trailer combina-
tion by increasing speed. Decrease your
speed and do not countersteer. Brake if nec-
essary. G
WARNING
If the maximum permissible load for a carrier system is exceeded, the carrier could come
loose from the vehicle and endanger other
road users. There is a risk of an accident and injury.
Never exceed the maximum permissible load
when using a carrier.
! If you have a trailer tow hitch retrofitted,
changes to the engine cooling system may be necessary, depending on the vehicle type.
If you have a trailer tow hitch retrofitted,
observe the anchorage points on the chassis.
Retrofitting a trailer tow hitch is only permissible
if a trailer load is specified in your vehicle docu-
ments. If this is not the case, then the vehicle is not approved for towing a trailer.
For more information, please contact a qualifiedspecialist workshop. Exceeding the maximum permissible nose-
weight of the trailer drawbar on the ball coupling
may cause damage to the following:
R your vehicle
R trailer
R ball coupling
R trailer tow hitch
The vehicle/trailer combination could become
unstable.
The vehicle/trailer combination could also
become unstable if the noseweight used is lower than the minimum permissible noseweight.
To avoid hazardous situations:
R make sure to check the noseweight before
each journey
R the noseweight should be as close as possible
to the maximum noseweight
R do not exceed the maximum permissible
noseweight
R the noseweight must not be lower than the
minimum permissible noseweight
Make sure that the following values are not
exceeded:
R the permissible noseweight
R the permissible trailer load
R the permissible rear axle load of the towing
vehicle
R the maximum permissible gross vehicle
weight of both the towing vehicle and the
trailer
The applicable permissible values, which must
not be exceeded, can be found:
R in your vehicle documents
R on the identification plates of the trailer tow
hitch and the trailer
R on the vehicle identification plate
If the values differ, the lowest value applies.
You will find the values approved by the manu-
facturer on the identification plates and for the
towing vehicle under "Technical data"
(Y page 359). G
WARNING
If you release the ball coupling or it does not
engage correctly when folding in, it will swing out. Within pivoting range of the ball coupling,
there is an increased risk of an accident and
injury. 212
Towing a trailerDriving and parking

Only release the ball coupling if the pivoting
range is unobstructed. Always make sure that the ball coupling engages when folding in.
When reversing the towing vehicle, make sure
there is nobody between the trailer and the vehi- cle.
Couple and uncouple the trailer carefully. If youdo not couple the trailer to the towing vehicle
correctly, the trailer could become detached.
When towing a trailer, your vehicle's handling
characteristics will be different to when driving
without a trailer.
The vehicle/trailer combination:
R is heavier
R is restricted in its acceleration and gradient-
climbing capability
R has an increased braking distance
R is affected more by strong crosswinds
R demands more sensitive steering
R has a larger turning circle
This can impair the vehicle's handling charac-
teristics. Adapt your driving style accordingly.
Maintain a safe distance. Drive carefully.
When towing a trailer, always adjust your speed to the current road and weather conditions. Do
not exceed the maximum permissible speed for
your vehicle/trailer combination. Notes on towing a trailer
General notes Trailer towing is not possible on the following
models:
R Mercedes‑AMG GLA 45 4MATIC
Items of optional equipment may influence the
effective trailer loads for the vehicle. Please find the applicable trailer loads for your vehicle on
the registration certificate.
When towing a trailer, set the tyre pressure on
the rear axle of the towing vehicle for a maxi-
mum load. Further information on the tyre pres-
sure table in the fuel filler flap (Y page 337).
Please note that when towing a trailer, the fol-
lowing driving systems have limited availability
or are not available at all:
R Parking Assist PARKTRONIC (Y page 193)
R Blind Spot Assist (Y page 209) The height of the ball coupling changes with the
load of the vehicle. If necessary, use a trailer
with a height-adjustable drawbar.
You will find fitting dimensions and loads under"Technical data" (Y page 359).
Driving tips Observe the information on ESP
®
trailer stabili-
sation (Y page 75).
The maximum permissible speed for vehicle/
trailer combinations depends on the type of
trailer. Before beginning the journey, check the
trailer's documents to see what the maximum
permitted speed is. Observe the legally prescri-
bed maximum speed in the relevant country.
For certain Mercedes-Benz vehicles, the maxi-
mum permissible rear axle load is increased
when towing a trailer. See the "Technical data"
section to find out whether this applies to your
vehicle. If when towing, the rear axle load is
increased even partly, the vehicle/trailer com-
bination may not exceed a maximum speed of
100 km/h for reasons concerning the operating
permit. This also applies in countries in which
the permissible maximum speed for vehicle/
trailer combinations is above 100 km/h.
When towing a trailer, your vehicle's handling
characteristics will be different to when driving
without a trailer and the vehicle will consume
more fuel.
Shift to a lower gear in good time on long and
steep downhill gradients. For vehicles with auto-
matic transmission, you need to have selected
manual drive program M(Y page 161).
This also applies if you have activated cruise
control, the speed limiter or Distance Pilot
DISTRONIC.
This will use the braking effect of the engine, so less braking will be required to maintain the
vehicle speed. This relieves the load on the
brake system and prevents the brakes from
overheating and wearing too quickly. If you need
additional braking, depress the brake pedal
repeatedly rather than continuously.
Briefly depressing the accelerator pedal on
downhill gradients while the manual drive pro-
gram Mis temporarily activated (vehicles with
automatic transmission): the automatic trans-
mission may switch back to the last active auto-
matic drive program Eor S. The automatic trans-
mission may shift to a higher gear. This can
reduce the engine's braking effect. Towing a trailer
213Driving and parking Z

Important safety notes
G
WARNING
If you operate information and communica-
tion equipment integrated in the vehicle when driving, you could be distracted from the traf-
fic situation. This could also cause you to lose control of the vehicle. There is a risk of an
accident.
Only operate this equipment when the traffic
situation permits. If you cannot be sure of this,
stop the vehicle paying attention to road and
traffic conditions and operate the equipment
with the vehicle stationary.
You must observe the legal requirements for the
country in which you are currently driving when operating the on-board computer. G
WARNING
If the instrument cluster has failed or mal-
functioned, you may not recognise function
restrictions relevant to safety. The operating
safety of your vehicle may be impaired. There is a risk of an accident.
Drive on carefully. Have the vehicle checked
at a qualified specialist workshop immedi-
ately.
The on-board computer shows only display mes- sages or warnings from certain systems on the
multifunction display. You should therefore
make sure your vehicle is operating safely at alltimes.
If the operating safety of your vehicle is
impaired, park the vehicle safely as soon as pos-
sible. Contact a qualified specialist workshop.
For an overview, see the instrument cluster illus-
tration (Y page 34). Displays and operation
Instrument cluster lighting
The light sensor in the instrument cluster auto-
matically controls the brightness of the multi-
function display. In daylight, the displays in the
instrument cluster are not illuminated. The lighting in the instrument cluster, in the dis-
plays and the controls in the vehicle interior can
be adjusted using the brightness control knob.
The brightness control knob is located on the
bottom left of the instrument cluster
(Y page 34).
X Turn the brightness control knob clockwise or
anti-clockwise.
If the light switch is set to the Ã,Tor
L position, the brightness is dependent
upon the brightness of the ambient light. Speedometer with segments
The speedometer is divided into segments on
vehicles with Distance Pilot DISTRONIC.
The segments in the speedometer indicate
which speed range is available.
R Variable speed limiter is activated
(Y page 178):
The segments light up from the start of the
scale to the selected speed limitation.
R Distance Pilot DISTRONIC is activated
(Y page 180):
One or two segments in the stored speed
range light up.
R Distance Pilot DISTRONIC detects a vehicle in
front moving more slowly than the stored
speed:
The segments between the speed of the vehi- cle in front and the stored speed light up. Rev counter
! Do not drive in the overrevving range. Doing
so will damage the engine.
The red band in the rev counter indicates the
engine's overrevving range.
The engine is limited within a range to protect
the engine when the red band is reached. Outside temperature display
You should pay special attention to road condi-
tions when temperatures are around freezing
point.
Bear in mind that the outside temperature dis-
play indicates the measured air temperature
and not the road surface temperature. Displays and operation
217On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions J
Check brake fluid Check brake fluid
level level There is insufficient brake fluid in the brake fluid reservoir.
In addition, the red Jwarning lamp lights up on the instrument
cluster and a warning tone sounds.
G WARNING
Braking efficiency may be impaired.
There is a risk of an accident.
X Stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not drive on.
X Secure the vehicle against rolling away (Y page 166).
X Consult a qualified specialist workshop.
X Do not top up the brake fluid. This does not correct the fault. #
Check Check
brake
brakepad
padwear
wear The brake pads/linings have reached their wear limit.
X Consult a qualified specialist workshop. G
Inoperative Inoperative One or more main features of the Mercedes-Benz Contact system is/
are malfunctioning.
X Consult a qualified specialist workshop. Active
Active
Brake
BrakeAssist
Assist
Functions
Functions currently
currently
limited
limited See
SeeOwner's
Owner's
Manual
Manual Active Brake Assist is temporarily inoperative.
Possible causes:
R the radar sensor system is temporarily inoperative, e.g. due to elec-
tromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation
R the system is outside the operating temperature range
R the on-board voltage is too low
Once the causes listed above no longer apply, the display message
disappears.
Active Brake Assist is operational again.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 166).
X Restart the engine. Active Brake Active Brake
Assist: Assist:
System
Systeminop‐
inop‐
erative
erative Active Brake Assist is unavailable due to a malfunction. Situation-
dependent braking assistance may also have failed.
X Consult a qualified specialist workshop immediately. PRE-SAFE inopera‐
PRE-SAFE inopera‐
tive See Owner's tive See Owner's
Manual Manual
Important PRE-SAFE
®
functions have failed. All other occupant safety
systems, e.g. airbags, remain available.
X Consult a qualified specialist workshop immediately. Display
messages
241On-board computer and displays Z