2015 MERCEDES-BENZ S-Class engine

Engine
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ;
N
The yellow Check Engine warning lamp lights up while the engine is running.
There may be a malfunction, for example:
R in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignition system
R in the fuel system
The emission limit values may be exceeded and the engine may be in emer-
gency mode.
X Have the vehicle checked as soon as possible at a qualified specialist work-
shop.
i In some states, you must immediately visit a qualified specialist workshop
as soon as the yellow Check Engine warning lamp lights up. This is due to the
legal requirements in effect in these states. If in doubt, check whether such legal regulations apply in the state in which you are currently driving. 8
N
The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
X Refuel at the nearest gas station. 8
N
The yellow reserve fuel warning lamp flashes while the vehicle is in motion.
In addition, the ;Check Engine warning lamp may light up.
The fuel system pressure is too low. The fuel filler cap is not closed correctly or the fuel system is leaking.
X Check that the fuel filler cap is correctly closed.
X If the fuel filler cap is not correctly closed: close the fuel filler cap.
X If the fuel filler cap is closed: visit a qualified specialist workshop. Warning and indicator lamps in the instrument cluster
363On-board computer and displays Z

Warning/
indicator
lamp
N
N Signal type
Possible causes/consequences and M MSolutions ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature gage is at the start of the bar display.
The temperature sensor for the coolant temperature gage is defective.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
X Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions. Do not continue driving under any
circumstances.
X Secure the vehicle against rolling away (Y page 220).
X Consult a qualified specialist workshop. 364
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ?
N
The red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked
or the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled sufficiently.
X Observe the additional display messages in the multifunction display.
X Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 220).
X Leave the vehicle and keep a safe distance from the vehicle until the engine
has cooled down.
X Check the coolant level and add coolant, observing the warning notes
(Y page 408).
X If you need to add coolant more often than usual, have the engine coolant
system checked.
X Make sure that the air supply to the engine radiator is not blocked, e.g. by
snow, slush or ice.
X Do not start the engine again until the coolant temperature is below 257 ‡
(125 †). Otherwise, the engine could be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in mountainous
terrain, and stop-and-go traffic. ?
N
The red coolant warning lamp comes on while the engine is running. A
warning tone also sounds.
The coolant temperature has exceeded 255 ‡ (124 †). The airflow to the
engine radiator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Do not drive when your engine is overheated. This can cause some fluids which may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can also cause serious burns which can
occur just by opening the hood.
There is a risk of injury.
X Observe the additional display messages in the multifunction display.
X Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 220).Warning and indicator lamps in the instrument cluster
365On-board computer and displays Z

Warning/
indicator
lamp
N
N Signal type
Possible causes/consequences and M MSolutions X
Leave the vehicle and keep a safe distance from the vehicle until the engine
has cooled down.
X Check the coolant level and add coolant, observing the warning notes
(Y page 408).
X If you need to add coolant more often than usual, have the engine coolant
system checked.
X Make sure that the air supply to the engine radiator is not blocked, e.g. by
snow, slush or ice.
X At coolant temperatures below 257 ‡(125 †), you can continue driving to
the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in mountainous
terrain, and stop-and-go traffic. Hybrid system
Warning/
indicator
lamp
N
N Signal type
Possible causes/consequences and M MSolutions é
N
The yellow RBS (recuperative brake system) warning lamp is on. In addition,
there may be a warning tone.
G Risk of accident
RBS is malfunctioning. Pedal travel may be longer than usual and braking
performance may be affected. The automatic engine switch-off function may also be deactivated.
X Observe the messages in the multifunction display (Y page 316).
X Drive on carefully.
X Visit a qualified specialist workshop. 366
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Vehicle
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions Ð
N
The red power steering warning lamp is lit while the engine is running.
The power steering is malfunctioning.
A warning tone also sounds.
G WARNING
You will need to use more force to steer.
There is a risk of an accident. X Check whether you are able to apply the extra force required.
X If you are able to steer safely: carefully drive on to a qualified specialist
workshop.
X If you are unable to steer safely: do not drive on. Contact the nearest
qualified specialist workshop. Warning and indicator lamps in the instrument cluster
369On-board computer and displays Z

Useful information
i This Operator's Manual describes all
models and all standard and optional equip- ment of your vehicle available at the time of
publication of the Operator's Manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops (Y page 29). Stowage areas
Loading guidelines
G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engine is running,
especially if the vehicle is in motion. There is a risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
open. G
WARNING
If objects, luggage or loads are not secured or not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury, particu-
larly in the event of sudden braking or a sud-
den change in direction.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey. G
WARNING
The exhaust tail pipe and tail pipe trim can
become very hot. If you come into contact
with these parts of the vehicle, you could burn
yourself. There is a risk of injury. Always be particularly careful around the
exhaust tail pipe and the tail pipe trim. Allow
these components to cool down before touch-
ing them.
The handling characteristics of a laden vehi-
cle are dependent on the distribution of the
load within the vehicle. For this reason, you
should observe the following notes when
transporting a load:
R Never exceed the maximum permissible
gross vehicle weight or the gross axle
weight rating of the vehicle (including occu-
pants). The values are specified on the vehi-
cle identification plate on the B-pillar of the
driver's door.
R The trunk is the preferred place to carry
objects.
R Position heavy loads as far forwards as pos-
sible and as low down in the trunk as pos-
sible.
R The load must not protrude above the
upper edge of the seat backrests.
R Always place the load behind unoccupied
seats if possible.
R Secure the load with sufficiently strong and
wear-resistant tie-downs. Pad sharp edges
for protection. Stowage spaces
Important safety notes G
WARNING
If you do not correctly store objects in the
vehicle interior, they can slip or be flung
around, thus striking vehicle occupants.
There is a risk of injury, especially when brak- ing or abruptly changing directions.
R Always store objects so that they cannot be
flung around in these or in similar situa-
tions.
R Always make sure that objects do not pro-
trude from stowage compartments, parcel
nets or stowage nets. 372
Stowage areasStowage and features

X
Press in cigarette lighter :.
Cigarette lighter :will pop out automati-
cally when the heating element is red-hot.
X To close: press cover ;closed until it
locks. Vehicles with a Rear Seat Entertainment Sys-
tem:
X Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To open: briefly press cover ;at the top.
The compartment opens.
X Press in cigarette lighter :.
Cigarette lighter :will pop out automati-
cally when the heating element is red-hot.
X To close: press cover ;closed until it
locks.
Vehicles with individual seats in the rear Example: Sedan X
Press lid :of the socket compartment
briefly.
The socket compartment opens.
X Press in cigarette lighter ;.
Cigarette lighter ;will pop out automati-
cally when the heating element is red-hot. 12 V sockets
General notes X
Turn the SmartKey to position 1in the igni-
tion lock (Y page 189).
The sockets can be used for accessories with a maximum draw of 180 W (15 A). Accesso-
ries include such items as chargers for mobile
phones.
If you use the sockets for long periods when
the engine is switched off, the battery may
discharge.
An emergency cut-out ensures that the on-
board voltage does not drop too low. If the on-
board voltage is too low, the power to the
sockets is automatically cut. This ensures
that there is sufficient power to start the
engine.
Socket in the front-compartment center console X
To open: briefly press marking =.
Stowage compartment :opens.
X Lift up the cover of socket ;.
X To close: press stowage compartment :
closed until it locks. 384
FeaturesStowage and features

Problems with the 115 V power socket
Problem
Possible causes/consequences and
M
MSolutions The warning lamp on
the 115 V power socket
is not lit. The on-board voltage is too low because the battery is too weak.
X Start the engine.
or
X Charge the battery (Y page 430).
If the indicator lamp still does not light up:
X Visit a qualified specialist workshop. The temperature of the DC/AC converter is temporarily too high.
X Remove the electronic device connector from the 115 V socket.
X Let the DC/AC converter cool down.
If the indicator lamp still does not light up after cooling down the
converter: X Visit a qualified specialist workshop. You have connected an electronic device that has a constant
nominal power of less than 150 watts, but has a very high switch-
on current. This device will not work. If you connect such a device, the 115 V power socket will not supply it with power.
X Connect a suitable electronic device. Coolbox in the rear compartment
Important safety notes G
WARNING
If you cover the ventilation grille for the cool-
box, it may overheat. There is a risk of fire.
Always make sure that the ventilation grille is not covered.
The ventilation grille for the coolbox is in the
trunk.
The coolbox can bear a maximum load of
7.7 lb (3.5 kg).
If you want to store a bottle in the upper com-
partment of the coolbox, the capacity of the
bottle must not exceed 17 fl. oz. (0.5 l).
Store only plastic bottles in the upper com-
partment of the coolbox. Using the coolbox
X
Vehicles with rear seat armrest: fold
down the rear seat armrest.
X Pull handle :and fold down cover ;.388
FeaturesStowage and features