the tachometer. There is otherwise a risk of
engine damage. :
Gear indicator
; Upshift indicator
Before the engine speed reaches the red area, an upshift indicator will be shown in the mul-
tifunction display.
X If the color in the speedometer multifunc-
tion display changes to red and the UP UPdis-
play message is shown, shift up a gear
using the right-hand steering wheel paddle
shifter.
The automatic transmission shifts up to the
next gear if this is permissible.
Downshifting X
Pull the left-hand steering wheel paddle
shifter (Y page 201).
The automatic transmission shifts down to
the next gear if this is permissible.
Maximum acceleration X Pull the left-hand steering wheel paddle
shifter until the transmission selects the
optimum gear according to the speed.
If you slow down or stop without shifting
down, the automatic transmission automati-
cally shifts down.
Switching off the manual drive program X
Press the program selector button
(Y page 200) repeatedly until Cor S
appears in the multifunction display. 204
Automatic transmissionDriving an
d parking
Problems with the transmission
Problem
Possible causes/consequences and
M
MSolutions The transmission has
problems shifting gear. The transmission is losing oil.
X Have the transmission checked at a qualified specialist work-
shop immediately. The acceleration ability
is deteriorating.
The transmission no
longer changes gear. The transmission is in emergency mode.
It is only possible to shift into
secondgear and reverse gear.
X Stop the vehicle.
X Shift the transmission to position P.
X Switch off the engine.
X Wait at least ten seconds before restarting the engine.
X Shift the transmission to position Dor R.
If D is selected, the transmission shifts into secondgear; ifRis
selected, the transmission shifts into reverse gear.
X Have the transmission checked at a qualified specialist work-
shop immediately. Problems with PLUG-IN HYBRID operation (Y
page 290).Transfer case
! Performance tests may only be carried
out on a 2-axle dynamometer. The brake
system or transfer case could otherwise be
damaged. Contact a qualified specialist
workshop for a performance test.
! To prevent ESP ®
from intervening, the
ignition must be switched off (SmartKey or
the Start/Stop button in position 0or 1) if:
R the electric parking brake is being tested
on a brake dynamometer.
R the vehicle is being towed with only one
axle raised (not permitted for vehicles
with 4MATIC).
The brake system could otherwise be dam-
aged.
! Vehicles with 4MATIC must not be towed
with either the front or the rear axle raised,
as doing so will damage the transmission. This section is only valid for vehicles with 4-
wheel drive (4MATIC). Power is always trans-
mitted to both axles. Refueling
Important safety notes
G
WARNING
Fuel is highly flammable. If you handle fuel
incorrectly, there is a risk of fire and explo-
sion.
You must avoid fire, open flames, creating
sparks and smoking. Switch off the engine
and, if applicable, the auxiliary heating before refueling. G
WARNING
Fuel is poisonous and hazardous to health.
There is a risk of injury.
You must make sure that fuel does not come into contact with your skin, eyes or clothing Refueling
205Driving and parking
Z
and that it is not swallowed. Do not inhale fuel
vapors. Keep fuel away from children.
If you or others come into contact with fuel,
observe the following:
R Wash away fuel from skin immediately
using soap and water.
R If fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance with-
out delay.
R If fuel is swallowed, seek medical assis-
tance without delay. Do not induce vomit-
ing.
R Immediately change out of clothing which
has come into contact with fuel. G
WARNING
Electrostatic buildup can create sparks and
ignite fuel vapors. There is a risk of fire and
explosion.
Always touch the vehicle body before opening the fuel filler flap or touching the fuel pump
nozzle. Any existing electrostatic buildup is
thereby discharged.
Do not get into the vehicle again during the
refueling process. Otherwise, electrostatic
charge could build up again.
! Do not use diesel to refuel vehicles with a
gasoline engine. Do not switch on the igni-
tion if you accidentally refuel with the
wrong fuel. Otherwise, the fuel will enter
the fuel system. Even small amounts of the wrong fuel could result in damage to the
fuel system and the engine. Notify a quali-
fied specialist workshop and have the fuel
tank and fuel lines drained completely.
! Overfilling the fuel tank could damage the
fuel system.
! Take care not to spill any fuel on painted
surfaces. You could otherwise damage the
paintwork.
! Use a filter when refueling from a fuel can.
Otherwise, the fuel lines and/or injection system could be blocked by particles from
the fuel can.
If you overfill the fuel tank, fuel could spray
out when the fuel pump nozzle is removed.
For further information on fuel and fuel quality
(Y page 490). Refueling
General information Pay attention to the important safety notes
(Y
page 205).
PLUG-IN HYBRID vehicles: pressure in the
fuel tank must be released before refueling.
Except PLUG-IN HYBRID vehicles: If you
unlock/lock the vehicle from the outside, the fuel filler flap also unlocks/locks.
The position of the fuel filler cap is displayed
8 in the instrument cluster. The arrow
next to the filling pump indicates the side of
the vehicle.
Preparing to refuel X
Switch off the engine.
X Open the driver's door.
The on-board electronics now have status
0. This is the same as the SmartKey having
been removed.
or, if the SmartKey is inserted in the ignition
lock: X Remove the SmartKey from the ignition
lock. 206
RefuelingDriving and parking
:
To insert the fuel filler cap
; Tire pressure table
= Fuel type to be used
X Turn the fuel filler flap counter-clockwise
and remove it.
X Insert the fuel filler cap into the holder on
the inside of the fuel filler flap.
X Completely insert the filler neck of the fuel
pump nozzle into the tank, hook in place
and refuel.
X Only fill the tank until the pump nozzle
switches off.
Do not add any more fuel after the pump
stops filling for the first time. Otherwise,
fuel may leak out.
Closing the fuel filler flap X
Replace the cap on the filler neck and turn
clockwise until it engages audibly.
X Close the fuel filler flap.
If you drive at speeds above 2 km/hw ith the
fuel filler flap open, the Tankklappe
Tankklappe offen offen
(Fuel filler flap open)
(Fuel filler flap open) message is
shown in the multifunction display.
i Close the fuel filler flap before locking the
vehicle.
i For further information on warning and
indicator lamps in the instrument cluster,
see (Y page 363).
i If you are driving with the fuel filler cap
open, the 8reserve fuel warning lamp
flashes. A message appears in the multi-
function display (Y page 339). In addition, the
;Check Engine warning
lamp may light up (Y page 363).
For further information on warning and indi- cator lamps in the instrument cluster, see
(Y page 363). 208
RefuelingDriving and parking
Problems with fuel and the fuel tank
Problem
Possible causes/consequences and
M
MSolutions Fuel is leaking from the
vehicle. G
WARNING
The fuel line or the fuel tank is faulty.
Risk of explosion or fire. X Apply the electric parking brake.
X Switch off the engine.
X Open the driver's door.
The on-board electronics now have status 0. This is the same as
the SmartKey having been removed.
or, if the SmartKey is inserted in the ignition lock:
X Remove the SmartKey from the ignition lock.
X Do not restart the engine under any circumstances.
X Consult a qualified specialist workshop. The fuel filler flap can-
not be opened. The fuel filler flap is not unlocked.
or
The SmartKey battery is discharged.
X Unlock the vehicle (Y page 91).
or X Unlock the vehicle using the mechanical key (Y page 93).The fuel filler flap is unlocked, but the opening mechanism is jam-
med.
X Consult a qualified specialist workshop. Charging the high-voltage battery
(plug-in hybrid vehicles) Important safety notes
G
DANGER
The vehicle's high voltage electrical system is under high voltage. If you modify components
in the vehicle's high-voltage electrical system or touch damaged components, you may be
electrocuted. The components in the vehi-
cle's high-voltage electrical system may be
damaged in an accident, although the damage
is not visible. There is a risk of fatal injury.
Following an accident, do not touch any high- voltage components and never modify the vehicle's high-voltage electrical system. Have
the vehicle towed away after an accident and
the vehicle's high-voltage electrical system
checked by a qualified specialist workshop. G
WARNING
In the event of a vehicle fire, the internal pres- sure of the high-voltage battery can exceed a
critical value. In this case flammable gas
escapes through a ventilation valve on the
underbody. The gas can ignite. There is a risk of injury.
Leave the danger zone immediately. Secure
the danger area at a suitable distance, whilst
observing legal requirements. Charging the high-voltage battery (plug-in hybrid vehicles)
209Driving and parking Z
In overrun mode, kinetic energy is converted
by means of energy recuperation into electri- cal energy and stored in the high-voltage bat-
tery.
The high-voltage battery can be charged as
follows:
R through energy recuperation while the
vehicle is in motion
R during the journey using the CHARGE mode
R with the relevant charging cable at an elec-
trical outlet while the vehicle is stationary
R with the relevant charging cable at a wall-
box while the vehicle is stationary
R with the relevant charging cable at a charg-
ing station while the vehicle is stationary
The high-voltage battery can be charged in a
nominal voltage range from 100 V to 240 V.
High and low outside temperatures Low outside temperatures
At very low outside temperatures the maxi-
mum power output of the high-voltage battery
may be reduced. The high-voltage battery is
then no longer able to provide the normal
electrical power output.
High outside temperatures
To prevent damage to the high-voltage bat-
tery due to very high outside temperatures,
the maximum power output of the high-volt-
age battery is reduced by the vehicle.
Energy consumption and electrical
range The maximum electrical range is generally
reduced by:
R high and low outside temperatures
R the use of air conditioning or heating
R switching on consumers The battery's physical characteristics are
such that leaving the vehicle parked for long
periods at low outdoor temperatures without
charging it can lead to:
R a reduction in battery performance
R longer charge times
Notes on battery care Avoid storing or transporting the vehicle in
temperatures that are too high or too low over
a long period (e.g. container transport).
If you park the vehicle and leave it stationaryfor longer periods, connect it to a power sup-
ply.
Conditions of use Please note the information on exceptions
and limitations in warranty documentation
and in the Maintenance Booklet.
Handling the charging cable and charg- ing cable controls Do not leave the charging cable controls
(Y
page 213) hanging loose from an electrical
outlet. Otherwise, this could result in a poor
contact with the electrical outlet and mal-
functions when charging the vehicle.
To ensure that the cable on the controls of the charging cable is not subjected to incorrect
loads, observe the following:
R Never lift the controls up at the charging
cable connector or the power supply plug.
R Do not carry the controls by the connector.
Heat generated by the charging cable
and connector Pay attention to the "Important safety notes"
(Y page 209).
During the charging process, the charging
cable and connector may heat up. Charging the high-voltage battery (plug-in hybrid vehicles)
211Driving and parking Z
The charging cable and connector will only
heat up within the permissible limiting values,
provided that:
R the power supply and the charging cable
are not damaged
R the instructions for handling the charging
cable and controls on the charging cable
are observed
If the charging cable or plug get too hot, have the mains power supply checked.
Protection device against overvoltage !
Overvoltage in the mains supply may
damage the vehicle. For this reason, the
vehicle is equipped with a protection device
against overvoltage in the mains supply.
This device may be triggered during severe thunderstorms, for example, and may lead
to the building's fuse being tripped and an
interruption in the power supply. These
functions protect the vehicle. After the
building fuse is switched on again, the
charging process resumes automatically.
Following an interruption in the power sup-
ply or tripping of the building's fuse, it may take up to 10 minutes for charging to
resume automatically.
Switch on the building's fuse again after it has
been triggered. Otherwise, the charging proc-
ess cannot be continued.
General information about the charging
procedure Pay attention to the important safety notes
(Y
page 209).
If you unlock/lock the vehicle from the out-
side, the charge socket flap also unlocks/
locks.
The charge socket flap is behind the bumper
on the right-hand side below the rear lamp
cluster. Charging the high-voltage battery via
the electrical outlet
Charging cable for mains sockets Important safety notes
! Only use the charging cable to charge the
high-voltage battery. Do not use the charg-
ing cable for other purposes. It may other-
wise be damaged.
A charging cable for connection to the mains
socket is included with the vehicle. Only use
the charging cable included with the vehicle
or charging cables that have been approved
for the vehicle.
i If you use the supplied 12 A charging
cable to charge a high-voltage battery:
R the charge time increases considerably
R electrical consumption increases consid-
erably
Where possible, charge the high-voltage
battery at a charging station (Y page 216).
Only then can certified electrical energy
consumption levels be reached.
i The charging process can vary depending
on the power supply. Therefore, always
observe the local information.
i For short charge times (charging with
16A), connect the fast-charging cable to
the wallbox/charging station. You can also
use the optionally available charging cable
with the CE plug.
Information about charging from a wallbox
can be found at (Y page 215).
Information about charging at a charging sta-
tion can be found at (Y page 216).
Stowing the charging cable
The charging cable can be stowed in the bag
supplied in the trunk of the vehicle and held in place with the Velcro fastener. 212
Charging the high-voltage battery (plug-in hybrid vehicles)Driving and parking
Controls on the charging cable
:
Alternating current status indicator
; Control/protection system indicator
= Charge current indicator
? Charge current setting button
When displays :and ;on the charging
cable light up, this means the following: Display
:
: Lights up
green The external power supply
connection is working prop-
erly. The high-voltage bat-
tery can be charged. Flashes red A malfunction has been
detected in the external
power supply. The high-volt-
age battery is recharged as
soon as the electricity signal
registers normal values. Lights up red There is a malfunction. The
charging cable must be
removed from the electrical
outlet and then re-inserted.
Display
; ; Lights up
green There are no malfunctions.
The high-voltage battery
can be charged.
Lights up red An impermissible current is
being supplied to the con-
trol unit. The high-voltage
battery cannot be charged. i
For information on problems relating to
the charging process, see (Y page 218).
Setting the maximum charge current G
WARNING
If the charge current draw via a mains socket is too high during the charging process, the
external electrical system may overheat.
There is a risk of fire.
Before beginning the charging process, checkthe maximum permissible charge current
locally. Consult a qualified expert to do so
where necessary.
If necessary, adjust your vehicle's settings.
! An excessive charge current can blow a
fuse or lead to overheating of the external
power supply. Check whether the external
power supply is compatible with the set
charge current. If necessary, lower the set
charge current or use another power
socket.
You can set a limit for the values of the charge current used in charging the high-voltage bat-
tery. This acts as a means of preventing the
power supply from overloading. You can set
this limit by using the controls on the charging
cable or in the on-board computer's menu.
Only set the maximum charge current in the
on-board computer menu if there are no
charge current settings on the charging
cable.
The default standard value in the vehicle cor- responds to the maximum charge current
value.
The default standard value on the charging
cable is the minimum charge current setting.This corresponds to the minimum available
charge current from the power supply. The
value on the charging cable can be increased
and is described in the following section.
i The value of the maximum setting and the
adjustment values may vary depending on
the country. Charging the high-voltage battery (plug-in hybrid vehicles)
213Driving and parking Z