
Problems with PARKTRONIC
Problem
Possible causes/consequences and
0050
0050Solutions Only the red segments
in the PARKTRONIC
warning displays are lit.
A warning tone also
sounds for approx-
imately 2 seconds.
PARKTRONIC is deacti-
vated after approx-
imately 20 seconds.
The indicator lamp of
the 0069 button lights
up and the red seg-
ments in the
PARKTRONIC warning
display go out. PARKTRONIC has malfunctioned and has switched itself off.
X If problems persist, have PARKTRONIC checked at a qualified
specialist workshop. The PARKTRONIC
warning displays
implausible distances.
For example, all the
segments may be lit
even though there is no
obstacle present. The PARKTRONIC sensors are dirty or iced up.
X Clean the PARKTRONIC sensors (Y page 268).
X Turn the key to position 2again in the ignition lock. The license plate or other parts attached near the sensors may not
be secured correctly.
X Check the license plate and attachment parts near the sensors
for correct seating. An external radio or ultrasonic source may be causing interfer-
ence.
X Check PARKTRONIC functions in a different location. Rear view camera
Important safety notes !
Objects that are not at ground level
appear further away than they actually are, for example:
R the bumper of the vehicle parked behind
R the drawbar of a trailer
R the ball coupling of a trailer tow hitch
R the tail-end of a truck
R slanted posts Only use the image from the rear view cam-
era as a guide. You may otherwise damageyour vehicle and/or the object.
The rear view camera is only an aid. It cannot
replace your own awareness of the immedi-
ate surroundings. You are responsible for
safe maneuvering, parking and pulling away.
When maneuvering, parking and pulling away, make sure that there are no persons, animals
or objects in the maneuvering area.
The rear view camera is a visual parking aid.
Information on operation can be found in the
separate Audio 15 supplement. Driving systems
171Driving and parking Z

The display in the instrument cluster is acti-
vated when you:
R open the driver's door
R turn the key to position 2in the ignition lock
R press the 0045reset button
R switch on the lights
The display switches off automatically after
approximately 30 seconds if:
R the key is in position 0in the ignition lock.
R the vehicle lighting is not switched on. Instrument lighting
When the lights are switched on, you can
adjust the brightness of the instrument clus-
ter lighting using the 0074and 0075buttons.
X To brighten: press the0074button.
X To dim: press the 0075button.
i Vehicles with automatic headlamp mode:
the instrument lighting also adapts to auto-
matic headlamp mode. Tachometer
! Do not drive in the overrevving range, as
this could damage the engine. H
Environmental note
Avoid driving at high engine speeds. This
unnecessarily increases the fuel consumption of your vehicle and harms the environment asa result of increased emissions.
The red band in the tachometer indicates the engine's overrevving range.
To protect the engine, the fuel supply is inter-
rupted when the red band is reached. Outside temperature
You should pay special attention to road con-
ditions when temperatures are around the
freezing point. On vehicles without steering wheel buttons
(Y page 182) and on vehicles with steering
wheel buttons (Y page 187), the outside tem-
perature display is in the display.
Changes in the outside temperature are dis-
played after a short delay. Speedometer
The speed can also be shown in the display.
You can find information on the digital speed-
ometer for vehicles without steering wheel
buttons under (Y page 182) and for vehicles
with steering wheel buttons under
(Y page 187).
i In some countries, a warning sounds
when the vehicle reaches the maximum
speed limit, e.g. at 75 mph (120 km/h). Trip odometer
X To reset: make sure that the display is
showing the trip odometer if you have a
vehicle with steering wheel buttons
(Y page 187).
X Press and hold the 0045reset button until the
trip odometer is reset to 0.0 0.0. Fuel gauge
0043
Fuel gage on vehicles without steering
wheel buttons
0044 Fuel gage on vehicles with steering wheel
buttons Instrument cluster
181On-board computer and displays Z

0087
Fuel filler flap location indicator 007F: the
fuel filler flap is on the left-hand side. Fuel filler flap location indicator 0080: the fuel
filler flap is on the right-hand side
0085 Reserve fuel warning lamp (Y page 224)DEF gauge
Vehicles without steering wheel but-
tons If the supply of DEF is less than 1.5 US gal
(5.5 l), the 00E2indicator lamp lights up and
the 0099 dEF Chk
dEF Chk display message appears.
If the supply of DEF falls below the reserve
range of 0.8 US gal (3.0 l), the 00E2indicator
lamp lights up and the 0099StArtS RExx StArtS RExx
display message appears. In the display, xx
xx
corresponds to the number of possible
remaining engine starts (16 16to0
0).
When the number of remaining engine starts
is 0
0 the engine management prevents the
vehicle being driven at a speed exceeding
5 mph (8 km/h). The multifunction display
shows the StArtS IdLE
StArtS IdLE message and you
hear a warning tone sequence.
Further information on DEF consumption can be found in the "Service products and filling
capacity" section (Y page 320).
Vehicles with steering wheel buttons If the supply of DEF is less than 1.5 US gal
(5.5 l), the Check Diesel Exhaust Fluid
Check Diesel Exhaust Fluid
See
See Operator's
Operator's Manual
Manualmessage is shown
in the display.
If the DEF supply falls below the reserve range
of 0.8 US ga l(3.0 l), the 00E2XX starts XX starts
remaining
remaining message is displayed. In the dis-
play, XX
XXcorresponds to the number of possi-
ble remaining engine starts (16 16to0
0).
When the number of remaining engine starts
is 0
0 the engine management prevents the
vehicle from being driven at a speed exceed- ing 5 mph (8 km/h). The multifunction display
shows the Idle Mode
Idle Mode message and you hear
a warning tone sequence. Further information on DEF consumption can
be found in the "Service products and filling
capacity" section (Y page 320). On-board computer (vehicles without
steering wheel buttons)
Operating the on-board computer
General notes The on-board computer is activated as soon
as you turn the key to position 1in the ignition
lock.
The on-board computer shows vehicle infor-
mation and settings in the display.
You can control the display and the settings in the on-board computer using the adjustment
buttons on the instrument cluster.
Standard display 0043
Odometer
0044 Trip odometer
0087 Clock
0085 Outside temperature or digital speedom-
eter
0083 Fuel gage (Y page 181)
0084 Selector lever position or current shift
range with automatic transmission
(Ypage 142)
X To call up the standard display: turn the
key to position 2in the ignition lock.
X Press the 0079menu button for longer than
1 second.
The information shown in the display
changes from the outside temperature to
the digital speedometer. 182
On-board computer (vehicles without steering wheel buttons)On-board computer and displays

Display messages
Possible causes/consequences and
0050
0050Solutions Err
Err flashes for 5 seconds, the
00B0indicator lamp also flashes and
then lights up constantly.
Lane Keeping Assist is deactivated and temporarily inoperative.
Possible causes are:
R There are no lane markings present.
R The camera's functionality is impaired due to heavy rain, snow or
fog.
R The camera cannot recognize the road markings:
- It is too dark.
- The lane markings are worn or are covered, for example, by
dirt or snow.
R The windshield is dirty in the camera's field of vision.
X Stop the vehicle paying attention to road and traffic conditions.
X Secure the vehicle to prevent it from rolling away (Y page 149).
X Clean the windshield (Y page 267), particularly in the camera's
field of vision.
If the 00B0 indicator lamp goes out, Lane Keeping Assist is
operational again.
If the problem persists, visit a qualified specialist workshop. 0099
dEF Chk dEF Chk In addition, the yellow
00B9Check Engine indicator lamp and the
yellow 00E2DEF indicator lamp light up and a warning tone
sounds.
The DEF reducing agent is contaminated, diluted or is not compli-
ant with ISO 2224 1.
After the first message and under normal operating conditions,
you can drive on for up to approximately 50 miles (80 km). Then a warning tone sequence sounds and the engine can only be started
another 10 times.
X Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. 200
Display messagesOn-board computer and displays

Display messages
Possible causes/consequences and
0050
0050Solutions 0099
dEF Chk dEF Chk In addition, the yellow
00E2DEF indicator lamp lights up and a
warning tone sounds.
The DEF supply has dropped below 1.5 US gal (5.5 l).
After the message appears for the first time, and under normal
driving conditions, the remaining DEF supply will last for approx-
imately 1000 miles (1600 km).
After that, the 0.8 US gal (3.0 l) reserve mark is reached. A warning tone sequence sounds and the engine can then only be started
another 16 times.
X Add DEF (Y page 147).
The 00E2 DEF indicator lamp disappears after no more than
20 seconds after the vehicle has stopped or you have switched
on the ignition or started the engine after refueling. 0099
StArtS RExx StArtS RExx In addition, the yellow
00E2DEF indicator lamp lights up and a
warning tone sequence sounds.
After the message appears for the first time, the engine can only be started another 10 times.
The number of remaining engine starts XX
XX (1010 to0 0) is shown in the
message every time the engine is started. When the number of
remaining engine starts is 0 0the engine management prevents the
vehicle being driven at a speed exceeding 5 mph (8 km/h). The
Idle Mode
Idle Mode message appears in the multifunction display. The DEF reducing agent is contaminated, diluted or is not compli-
ant with ISO 22241.
X Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. The exhaust gas aftertreatment is malfunctioning or an emission
relevant malfunction has occurred. This malfunction or defect can
damage the exhaust gas aftertreatment.
X Visit a qualified specialist workshop immediately. Display messages
201On-board computer and displays Z

Display messages
Possible causes/consequences and
0050
0050Solutions 0099
StArtS RExx StArtS RExx In addition, the yellow
00E2DEF indicator lamp lights up and a
warning tone sequence sounds.
The DEF supply has dropped below the 0.8 US gal (3.0 l) reserve
mark.
After the message appears for the first time, the remaining DEF
supply will last for approximately 1000 miles (1600 km). The
engine can then only be started another 16 times.
The number of remaining engine starts XX XX(1616 to1
1) is shown in the
message every time the engine is started.
X Add at least 2.0 US gal (7.6 l) of DEF (Y page 147).
The 00E2 DEF indicator lamp disappears after no more than
20 seconds after the vehicle has stopped or you have switched
on the ignition or started the engine after refueling. 0099
StArtS IdLE StArtS IdLE If the message
StArtS IdLE
StArtS IdLEis displayed, you cannot drive the
vehicle at a speed exceeding 5 mph (8 km/h).
X Add at least 2.0 US gal (7.6 l) of DEF (Y page 147).
The 00E2 DEF indicator lamp disappears after no more than
20 second safter the vehicle has stopped or you have switched
on the ignition or started the engine after refueling. Err
Err flashes for 5 seconds, the
00CEindicator lamp also flashes and
then goes out.
Highbeam Assist is deactivated and temporarily not operational or
Highbeam Assist is malfunctioning.
Possible causes are:
R The camera's functionality is impaired due to heavy rain, snow or
fog.
R The windshield is dirty in the camera's field of vision.
X Stop the vehicle paying attention to road and traffic conditions.
X Secure the vehicle to prevent it from rolling away (Y page 149).
X Clean the windshield (Y page 267), particularly in the camera's
field of vision.
If the 00CE indicator lamp goes out, Highbeam Assist is opera-
tional again.
If the problem persists, visit a qualified specialist workshop. 202
Display messagesOn-board computer and displays

Engine
Display messages
Possible causes/consequences and
0050
0050Solutions Exhaust Filter:
Exhaust Filter:
Drive at high Drive at high
engine speed. See engine speed. See
Oper. Manual Oper. Manual The automatic regeneration of the diesel particle filter is not suf-
ficient or has malfunctioned.
X Drive at an engine speed of above 2000 rpm until the display
message disappears.
If the display message does not go out after approximately
20 minutes, have the malfunction rectified immediately at a
qualified specialist workshop. Check Diesel Check Diesel
Exhaust Fluid See Exhaust Fluid See
Operator's Manual Operator's Manual The Diesel Exhaust Fluid (DEF) supply has dropped below
1.5 US gal (5.5 l).
After the message appears for the first time, and under normal
driving conditions, the remaining DEF supply will last for approx-
imately 1000 miles (1600 km).
After that, the 0.8 US gal (3.0 l) reserve mark is reached. A warning
tone sequence sounds and the engine can then only be started
another 16 times.
X Add DEF supply (Y page 147).
After topping up, the system check takes approximately
20 seconds. The display message then disappears. Check Diesel Check Diesel
Exhaust Fluid See Exhaust Fluid See
Operator's Manual Operator's Manual If the yellow
00B9Check Engine indicator lamp lights up as well,
the DEF reducing agent is contaminated, diluted or not compliant
with ISO 22241.
After the first message and under normal operating conditions,
you can drive on for up to approximately 50 miles (80 km). Then a
warning tone sequence sounds and the engine can only be started
another 10 times.
Have the DEF tank cleaned and refilled at a qualified specialist
workshop as soon as possible. 00E2
XX XX
starts
starts remaining
remaining The Diesel Exhaust Fluid (DEF) supply has dropped below the
0.8 US gal (3.0 l) reserve mark.
After the message appears for the first time, the remaining DEF
supply will last for approximately 1000 miles (1600 km). The
engine can then only be started another 16 times.
The number of remaining engine starts
XX
XX (1616 to0 0) is shown in the
message every time the engine is started.
X Add at least 2.0 US gal (7.6 l) of DEF (Y page 147).
The display message disappears no more than 20 seconds after
the vehicle has stopped or you have switched on the ignition or started the engine after refueling. Display messages
211On-board computer and displays Z

Display messages
Possible causes/consequences and
0050
0050Solutions 003E
Hood open Hood open You are already driving at walking pace, even though the hood is
not closed.
X Close the hood. 0064
Please enter PIN: Please enter PIN: You have not yet entered your PIN in the mobile phone.
X Enter the PIN for the SIM card. 003E
Doors open Doors open You are already driving at walking pace, even though not all the
doors are closed.
X Close the doors. 00B1
Check wash. fluid Check wash. fluid
level level The washer fluid level is too low.
X Add washer fluid (Y page 255).Key
Display messages
Possible causes/consequences and
0050
0050Solutions 0039
Replace key Visit Replace key Visit
workshop workshop The key is no longer working.
X Visit a qualified specialist workshop. Indicator and warning lamps in the instrument cluster
When switching on the ignition, some systems carry out a self-test. Some indicator and warn- ing lamps may temporarily turn on or start to flash. This is not an indication of any problem.
Only when these indicator and warning lights turn on or start flashing after the engine has
started or during the journey has a malfunction occurred. Indicator and warning lamps in the inst
rumentcluster
217On-board computer and displays Z