MERCEDES-BENZ S-CLASS SALOON LONG 2020 Owners Manual

Engine oil
Display messages
Possible causes/consequences and M
MSolutions
5 Add 1 litre engine oil when
next refuelling *T
he engine oil le vel has dropped tothe minimum le vel.
* NO
TEEngine dama gecaused bydriving with insuf ficient engine oil #
Avoid long journe yswith insuf ficient engine oil. #
When next refuelling, add 1 litre of engine oil (/ page 351).
No tes on engine oil (/ page 485).
5
Engine oil level Reduce oil
level *T
he 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 le velre duced.
5 Engine oil level Stop vehi-
cle Switch engine off *T
he 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. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. 548
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Switch off the engine. #
Add 1 l of engine oil (/ page 351). #
Check the engine oil le vel.
No tes on engine oil (/ page 485).
5
Engine oil pressure Stop
Switch off engine *T
he oil pressure is too lo w.
* NO
TEEngine dama gecaused bydriving with insuf ficient oil pressure #
Avoid driving with insuf ficient oil pressure. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Consult a qualified specialist workshop.
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. Display messages and
warning/indicator lamps 549

Wa
rning and indicator lamps Overview of indicator and
warning lamps Some sy
stems will per form a self-test when the
ignition is switched on. Some indicator and
wa rning lamps may briefly light up or flash. This
behaviour is non-critical. These indicator and
wa rning lamps indicate a malfunction only if they
light up or flash af terth e engine has been star‐
te d or during a journe y.
Driver display Driver display with driver camera
Indicator and
warning lamps:
6 Re
stra int sy stem (/ page 551)
ü Seat belt (/
page 551)
ï Trailer hit ch (/page 552)
Ù Powe rst eering (yellow)
(/ page 552)
Ù Powe rst eering (red) (/ page 552)
Ù Rear-axle steering (yellow)
(/ page 552)
Ù Rear-axle steering (red)
(/ page 552) ÿ
Coolanttemp erature (/ page 555)
; Engine diagnostics (/
page 555)
% Preglow
# Elect
rical fault (/ page 555)
8 Re
ser vefuel with fuel filler flap loca‐
tion indicator (/ page 555)
! Elect
ric pa rking brake (red)
(/ page 558)
! Electric parking brake (yellow)
(/ page 558)
J Brakes (yellow) (/
page 558)
J Brakes (red) (/
page 558)
L Distance warning (/ page 560)
ä AIRMATIC (/ page 560)
! ABS (/
page 562)
÷ ESP®
(/ page 562)
å ESP®
OFF (/ page 562)
H Mercedes me connect
(/page 564)
h Ty
re pressure monitoring sy stem
(/ page 565) 550
Display messages and warning/indicator lamps

T
St
anding lights (/ page152)
L Low beam (
/page 152)
K High beam (/
page154)
#! Tu
rn signal lights (/ page154)
R Re
ar fog light (/ page152) Occupan
t safety Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
6 Re stra int sy stem warning
lamp *T
he redre stra int sy stem warning lamp is lit while the engine is running.
The restra int sy stem is malfunctioning (/ page41). &
WARNING Risk of inju rydue tomalfunctions in there stra int sy stem
Components in there stra int sy stem may be activated unintentionally or not deploy as intended in an accident. #
Have there stra int sy stem checked and repaired immediately at a qualified specialist workshop. #
Drive on carefully. #
Comply with the messages on the driver displa y. #
Consult a qualified specialist workshop immediatel y. Displ
aymessa ges and warning/indicator lamps 551

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ü Seat belt warning lamp
fl ashes *T
he red seat belt warning lamp flashes and an intermit tent wa rning tone sounds.
The driver or front passenger has not fastened his/her seat belt while theve hicle is in motion. #
Fasten your seat belt (/ page 45).
There are objects on the front passenger seat. #
Remo vethe objects from the front passenger seat.
ü
Seat belt warning lamp
lights up *T
he red seat belt warning lamp lights up once the engine has star ted.
In addition, an intermittent warning tone may sound.
The red seat belt warning lamp reminds the driver and front passenger tofasten their seat belts. #
Fasten your seat belt (/ page 45).
If yo u ha veplaced objects on the front passenger seat, there d seat belt warning lamp may remain lit. Ve
hicle Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ï Tr ailer tow hit chwarning
lamp *T
hered trailer hitch warning lamp is lit.
The trailer hitch is not operational or is swivelling. &
WARNING Risk of an accident if the ball neck is not loc ked
The trailer may become de tach ed. 552
Display messages and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Uncouple the trailer and secure it against rolling away. #
Initiate a new swivel mo vement and do not re-couple the trailer until thewa rning/indicator lamp goes out. #
Notethe messages on the driver displa y.
If th e trailer hitch is swivelling: #
Wait until the ball neck has reached the operational position.
Ù
Po we rst eering warning
lamp (yellow) *T
he yellow po werst eering warning lamp is lit when the engine is running.
The po wer assi stance or thesteering itself is malfunctioning. #
Notethe messages on the driver displa y.
Ù Po we rst eering warning
lamp (red) *T
he red po werst eering warning lamp is lit while the engine is running.
The po wer assi stance or thesteering itself is malfunctioning. &
WARNING Risk of accident if steering capability is impaired
If th esteering does not function as intended, theve hicle's operating saf ety is jeopardised. #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances. Display messa
ges and warning/indicator lamps 553

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
Consult a qualified specialist workshop. #
Notethe messages on the driver displa y.
Ù Re ar axle steering warning
lamp (yellow) *T
he yellow rear axle steering warning lamp is lit while the engine is running.
The rear axle steering is malfunctioning. #
Notethe messages on the driver displa y.
Ù Re ar axle steering warning
lamp (red) *T
he redre ar axle steering warning lamp is lit while the engine is running.
The rear axle steering is malfunctioning. &
WARNING Risk of accident if steering capability is impaired
If th esteering does not function as intended, theve hicle's operating saf ety is jeopardised. #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances. #
Consult a qualified specialist workshop. #
Notethe messages on the driver displa y.554
Display messages and warning/indicator lamps

Engine
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ÿ Coolant warning lamp (red) *T
he 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
R The engine coolant pump is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120°C. &
WARNING Risk of bu rns when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
R You could come into contact with other hot, escaping operating 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. Display messages and
warning/indicator lamps 555

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. Do not continue
driving. #
Notethe messages on the driver displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop.
If th e coolant temp erature display is at the upper end of thete mp erature scale: #
Exit theve hicle and keep a safe dis tance from it until the engine has cooled down. #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that the
coolant temp erature display remains below 120°C.
ÿ Coolant warning lamp (yel‐
low) *T
he yellow coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The charge air, transmission oil or bat tery cooling is faulty
R The radiator shutters are bloc ked or defective #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. 556
Display messages and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
; Engine diagnosis warning
lamp *T
he yellow engine diagno stics warning lamp is lit while the engine is running.
A malfunction has occu rred in the engine, theex haust sy stem or the fuel sy stem.
The emissions limit value may ha vebeen exceeded and the engine may be running in emergency operation mode. #
Have theve hicle checked as soon as possible at a qualified specialist workshop.
Ve hicles with a diesel engine: the fuel tank may ha vebeen run dr y. #
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.
#
Elect rical fault warning
lamp *T
hered elect rical fault warning lamp is lit.
There is a fault in the electrics. #
Notethe messages on the driver's displa y.
8
Fu elreser ve wa rning lamp
lights up *T
he yellow fuel reser vewarning lamp lights up while the engine is running.
The fuel supply has dropped into there ser verange. #
Refuel. Displ
aymessa ges and warning/indicator lamps 557