2018 MERCEDES-BENZ A-CLASS SALOON sensor

The proportion of cor
rosion inhibitor/antifreeze
concentrate in the engine cooling sy stem should
be:
R a minimum of 50% (antifreeze pr otection
down toappr oximately -37 °C)
R a maximum of 55% (antifreeze pr otection
down to-45 °C) Note
s on windscreen washer fluid Obser
vethe no tes on operating fluids
(/ page 496). &
WARNING ‑ Risk of fire and injury due to
windscreen washer concentrate
Wi ndsc reen washer concentrate is highly
fl ammable. It could ignite if it comes into
con tact wi thhot engine component parts or
th eex haust sy stem. #
Make sure that no windsc reen washer
concentrate spills out next tothefiller
opening. *
NO
TEDama getotheex terior lighting
due tounsuitable windsc reen washer
fl uid Uns
uitable windsc reen washer fluids may
damage the plastic sur face of theex terior
lighting. #
Only use windscreen washer fluids
which are also suitable for use on plas‐
tic sur faces, e.g. MB SummerFit or MB
Wi nterFit. *
NO
TEBlocked spr aynozzles caused by
mixing windscreen washer fluids #
Do not mix MB SummerFit and MB Win‐
te rFit with other windscreen washer flu‐
ids. Do not use distilled or de-ionised
water asthefill
le ve l sensor may be triggered er roneously.
Re commended windscreen washer fluid:
R Abo vefreezing point: e.g. MB SummerFit
R Below freezing point: e.g. MB WinterFit Fo
rth e cor rect mixing ratio, referto the informa‐
tion on the antif reeze conta iner.
Mix thewa sher fluid with the windscreen washer
fl uid all year round. Ve
hicle data Ve
hicle dimensions The heights speci
fied may vary as a result of the:
R tyres
R load
R condition of the suspension
R optional equipment 504
Tech nical da ta

Display messages
Possible causes/consequences and M
MSolutions
ATTENTION ASSIST inoper-
ative
Active Blind Spot Assist
inoperative *A
ctive Blind Spot Assi stis malfunctioning. #
Consult a qualified specialist workshop.
Speed Limit Assist cur-
rently unavailable See Own-
er's Manual *S
peed Limit Assist is temp orarily una vailable. #
Drive on.
Once the cause of the problem is no longer present, the sy stem will be available again. Currently unavailable
Radar sensors dirty
*T
heradar sensor sy stem is malfunctioning. Possible causes:
R dirt on the sensors
R heavy rain or snow
R extended country driving wi thout other traf fic, e.g. in the desert
Driving sy stems and driving saf ety sy stems may be malfunctioning or temp orarily una vailable.
Once the cause of the problem is no longer present, driving sy stems and driving saf ety sy stems will be available
again.
If th e display message does not disappear: #
Pull over and stop theve hicle, paying attention toroad and traf fic conditions. #
Clean all senso rs (/ page442). #
Restart the engine. Display messages and
warning/indicator lamps 527

Engine oil
Display messages
Possible causes/consequences and M
MSolutions
5 Engine oil level cannot be
measured *T
he electrical connection tothe oil le vel sensor has been inter rupte d or the oil le vel sensor is faulty. #
Consult a qualified specialist workshop.
4 Engine oil level Reduce oil
level *D
isplay message only for cer tain engines:
The engine oil le vel is too high.
* NO
TEEngine dama gecaused bydriving with excess engine oil #
Avoid long journe yswith excess engine oil. #
Consult a qualified specialist workshop immediately and ha vethe engine oil siphoned off.
4 Engine oil level Stop vehi-
cle Switch engine off *D
isplay message only for cer tain engines:
The engine oil le vel is too lo w.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. Display messages and
warning/indicator lamps 535

Display messages
Possible causes/consequences and M
MSolutions
Yo u could then lose control of theve hicle. #
Obser vethere commended tyre pressures. #
Adjust the tyre pressure if necessar y. #
Stop theve hicle, paying attention toroad and traf fic conditions. #
Check the tyre pressure (/ page470) and the tyres.
h Rectify tyre pressure *T
he tyre pressure is too low in at least one of the tyres, or the tyre pressure dif fere nce between the wheels is too
great. #
Check the tyre pressure and add air, if necessar y. #
When the tyre pressure is cor rect, restart the tyre pressure monitoring sy stem (/ page473).
h Tyre press. monitor cur-
rently unavailable *T
here is inter fere nce from a po werful radio signal source. As a result, no signals from the tyre pressure sensors are
re cei ved. The tyre pressure monitoring sy stem is temp orarily una vailable. #
Drive on.
The tyre pressure monitoring sy stem restarts automatically as soon as the cause has been rectified.
h
Wheel sensor(s) missing *T
he tyre pressure sensor signal is missing from one or more tyre(s). The pressure of the af fected tyre is not dis‐
pl ay ed. #
Have thefa ulty tyre pressure sensor replaced at a qualified specialist workshop. Display messages and
warning/indicator lamps 547

Display messages
Possible causes/consequences and M
MSolutions
h Tyre press. monitor inoper-
ative No wheel sensors *T
he wheels fitted do not ha vesuitable tyre pressure sensors. The tyre pressure monitoring sy stem is deactivated. #
Fit wheels with suitable tyre pressure sensors.
h
Tyre press. monitor inoper-
ative *T
he tyre pressure monitoring sy stem is faulty. &
WARNING Thereis a risk of an accident if the tyre pressure monitoring sy stem is malfunctioning
If th e tyre pressure monitoring sy stem is malfunctioning, it is not able toissue a warning if there is pressure
loss in one or more of the tyres.
Ty res with insuf ficient tyre pressure ma y,forex ample, af fect theve hicle's handling characteristics, steering and
braking. ‑ #
Have the tyre pressure monitoring sy stem checked at a qualified specialist workshop. #
Consult a qualified specialist workshop.
Tyre(s) overheated *A
t least one tyre is overheating. The af fected tyres are displ ayed in red. At temp eratures close tothe limit value,
th e tyres are displa yed in yello w. #
Drive more sl owly.
Reduce speed *A
t least one tyre is overheating. The af fected tyres are displ ayed in red. At temp eratures close tothe limit value,
th e tyres are displa yed in yello w. 548
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
b Malfunction See Owner's
Manual *T
heexterior lighting is faulty. #
Consult a qualified specialist workshop.
Ve hicles with a trailer hitch: a fuse may haveblown. #
Pull over and stop theve hicle, paying attention toroad and traf fic conditions. #
Check the fuses and replace them if necessary (/ page 465).
b
Switch on headlamps *Y
ou are driving without lo w-beam headlamps. #
Turn the light switch totheL orà position.
b
Automatic driving lights
inoperative *T
he light sensor is faulty. #
Consult a qualified specialist workshop.
Adaptive Highbeam Assist
inoperative *A
daptive Highbeam Assist is malfunctioning. #
Consult a qualified specialist workshop.
Adaptive Highbeam Assist
currently unavailable See
Owner's Manual *A
daptive Highbeam Assist is temp orarily una vailable.
The sy stem limits ha vebeen reached (/ page132). Displ
aymessa ges and warning/indicator lamps 559

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
Start the engine thre eto four times af terre fuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency operation mode is cancelled. The vehicle need not
be checked.
æ Fu elreser ve wa rning lamp The
yellow fuel reser ve wa rning lamp lights up while the engine is running.
The fuel supp lyhas dropped into there ser verange. #
Refuel.
#
Electrical fault warning
lamp The
red elect rical fault warning lamp is lit.
There is a fault in the electrics. #
Obser vethe messages on the multifunction displa y.
?
Coolant warning lamp The
red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120 °C. Displ
aymessa ges and warning/indicator lamps 569

Cruise cont
rol off ................................ 529
Cur rently una vailable Camera view
re stricted ............................................. 530
Cu rrently unavailable Radar sensors
dirty .....................................................5 27
! currently una vailable See Own‐
er's Manual .......................................... 516
÷ currently una vailable See Own‐
er's Manual .......................................... 51 0
Dep ress clutch fully tostart engine .....5 42
Drive sy stem Malfunction Stop
Switch engine off ................................ 533
Drive sy stem Malfunction Visit work‐
shop ....................................................5 33
5Engine oil le vel cannot be
measured ............................................ 535
4Engine oil le velRe duce oil le vel...5 35
4Engine oil le velSt op vehicle
Switch engine off ................................ 535 4Engine oil pressure
Stop Switch
off engine ............................................ 536
6Fr ont left malfunction Consult
wo rkshop (Example) ............................5 21
Fr ont-passenger airbag disabled See
Owner's Manual ................................... 519
Fr ont-passenger airbag enabled See
Owner's Manual ................................... 51 8
& inope rative Battery low ............... 557
&inoperati veRefuel vehicle ........... 557
&inoperative See Owner's Man. ....556
!inoperative See Owner's Man‐
ual ........................................................ 517
÷ inope rative See Owner's Man‐
ual ....................................................... .517
T inope rative See Owner's Man‐
ual ....................................................... .514
G Inoperative .................................. 521
bIntellige nt Light System inoper‐
ative ....................................................5 57Á
Key not de tected (red displ ay
messa ge).............................................5 49
ÁKe y not de tected (white dis‐
pl ay messa ge).....................................5 50
bLeft dipped beam (Example) ....... 558
6Left wind owbag malfunction
Consult workshop (Example) ................518
Limiter inoperative .............................. 529
Limiter passive .................................... 530
bMalfunction See Owner's Man‐
ual ....................................................... 559
ðMaximum speed exceeded ..........5 30
Mercedes me connect Services limi‐
te d See Owner's Manual .....................520
N permanently active Risk of vehicle
ro lling .................................................. 542
ç Off............................................... 528
ëOff ............................................... 526
Only select Park (P) when vehicle is
st ationary ............................................ 543 Index
585