Problem
Possible causes/consequences and
X XSolutions h
The yellow tyre
pressure moni-
tor* warning
lamp is on. G
Risk of accident
The tyre pressure monitor* has detected a sudden or significant
pressure loss in at least one of the tyres.
X Stop the vehicle without making any sudden steering or braking
manoeuvres. Pay attention to traffic conditions as you do so.
X Observe the additional messages in the multi-function display
(Y page 251). 7
The red seat belt
warning lamp
lights up for six
seconds after
the engine is
started 43
. The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X
Fasten your seat belt (Y page 89).7
After the engine
starts, a warning
tone sounds for
up to six sec-
onds43
. G
Risk of injury
The driver's seat belt is not fastened.
X Fasten your seat belt (Y page 89).
The warning tone ceases. 7
The red seat belt
warning lamp
lights up after
the engine
starts, as soon
as the driver's
door or the
front-passenger
door is closed. G
Risk of injury
The driver or front passenger has not fastened their seat belt.
X Fasten your seat belt (Y page 89).
The warning lamp goes out. G
Risk of injury
There are objects on the front-passenger seat.
X Remove the objects from the front-passenger seat and stow
them safely.
The warning lamp goes out. 43
Only for certain countries. 286
TroubleshootingPractical advice
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 286
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:12; WK
Problem
Possible causes/consequences and
X
X Solutions 7
The red seat belt
warning lamp
flashes and an
intermittent
audible warning
sounds. G
Risk of injury
The driver or front passenger has not fastened their seat belt. At
the same time, you are driving faster than 25 km/ho r have briefly
driven faster than 25 km/h.
X Fasten your seat belt (Y page 89).
The warning lamp goes out and the intermittent audible warning
ceases. G
Risk of injury
There are objects on the front-passenger seat. At the same time,
you are driving faster than 25 km/h or have briefly driven faster
than 25 km/h.
X Remove the objects from the front-passenger seat and stow
them safely.
The warning lamp goes out and the intermittent audible warning
ceases. 8
The yellow
reserve fuel
warning lamp
lights up while
the engine is
running. The fuel level has fallen below the reserve range. The operation of
the auxiliary heating* can no longer be guaranteed.
X
Refuel at the nearest filling station. Warning tones
Problem
Possible causes/consequences and
X
X Solutions The anti-theft warning
alarm* is triggered. You have opened the vehicle with the anti-theft alarm system still
activated*.
X Switch off the alarm (Y page 65). You hear a warning
tone. A message appears in the multi-function display.
X
See the explanations for the display message (Y page 251). You are driving with the parking brake applied.
X
Release the parking brake. The lights are still switched on when you leave the vehicle.
X
Turn the light switch to c. Troubleshooting
287Practical advice
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 287 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:12; WK
Problem
Possible causes/consequences and
X XSolutions G
Risk of injury
The driver or front passenger has not fastened their seat belt.
X Fasten your seat belt (Y page 89).You hear a continuous
tone.
Vehicles without DIRECT SELECT gearshift*:
You have switched the engine off, opened the driver's door and
released the seat belt, or opened the bonnet, with the HOLD func-
tion or Distronic Plus* activated.
X
Deactivate the HOLD function (Y page 151).
or
X Deactivate Distronic Plus* (Y page 146).You hear a warning
tone.
The red distance warning lamp*
·lights up while the vehicle
is in motion.
X Observe the explanations for the distance warning lamp*
(Y page 281). You hear a dual warning
tone.
The red Blind Spot Assist* warning lamp
9flashes in one of
the exterior mirrors.
X Observe the explanations for the Blind Spot Assist* warning
lamp (Y page 280). Accident
Problem
Possible causes/consequences and
X XSolutions Fuel is leaking from the
vehicle.
G
Risk of fire
The fuel line or the fuel tank has been damaged. The leaking fuel
creates a risk of fire or explosion.
X Switch off the ignition immediately.
X Remove the ignition key.
Do not restart the engine under any circumstances. The leaking
fuel creates a risk of fire or explosion.
X Consult a qualified specialist workshop. You are unable to
determine the extent of
the damage.
X
Consult a qualified specialist workshop. You cannot detect any
damage.
X
Start the engine as normal. 288
TroubleshootingPractical advice
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 288
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:13; WK
Engine
Problem
Possible causes/consequences and
X
X Solutions The engine will not
start.
The HOLD function or Distronic Plus* is activated.
X
Switch off HOLD (Y page 151) or Distronic Plus (Y page 146).
X Try to start the engine again. The engine will not
start. You can hear the
starter motor operat-
ing. R
There is a malfunction in the engine electronics.
R There is a malfunction in the fuel supply.
R The on-board voltage is too low because the starter battery is
too weak or discharged.
X Before the next start attempt, turn the key back to position 0
(Y page 75) in the ignition lock or press the Start/Stop but-
ton* until all the indicator lights in the instrument cluster have
gone out.
X Try to start the engine again (Y page 103). When doing so,
remember that excessively long and frequent attempts to start
the engine will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine will not
start. You can hear the
starter motor operat-
ing. The reserve fuel
warning lamp is on and
the fuel gauge
shows
0. The fuel tank has been run dry.
X
Refuel the vehicle. The engine will not
start. You cannot hear
the starter motor. The on-board voltage is too low because the starter battery is too
weak or discharged.
X
Jump-start the vehicle (Y page 323).
If the engine does not start despite attempting to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to a thermal load that was too high.
X
Allow the starter motor to cool down for approximately two
minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop. Troubleshooting
291Practical advice
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 291 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:13; WK
Problem
Possible causes/consequences and
X XSolutions Vehicles with a petrol
engine:
The engine is not run-
ning smoothly and is
misfiring. There is a malfunction in the engine electronics or a mechanical
component of the engine control unit.
X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist
workshop.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it. The coolant tempera-
ture gauge shows a
value above 120 †.
The coolant warning
lamp may also light up
and a warning tone may
sound (Y
page 117). The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X
Stop as soon as possible and allow the engine and the coolant
to cool down.
X Check the coolant level (Y page 221). Observe the warning
notes as you do so and top up the coolant if necessary. If the coolant level is correct, the radiator fan may be faulty. The
coolant is too hot and the engine is no longer being cooled suffi-
ciently.
X
If the coolant temperature is less than 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving on
mountain roads and stop/start driving. 292
TroubleshootingPractical advice
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 292
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:13; WK
Automatic transmission*
Problem
Possible causes/consequences and
X
X Solutions 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 Move the transmission to position P.
X Turn the key in the ignition to position 0(Y page 75) or press
the Start/Stop button* repeatedly until all indicator lamps in
the instrument cluster go out.
X Wait at least 10 seconds before restarting the engine.
X Move 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. PARKTRONIC*
Problem
Possible causes/consequences and
X
X Solutions Only the red segments
in the PARKTRONIC
warning display are lit.
You also hear a warning
tone for approximately
two seconds.
PARKTRONIC is deacti-
vated after approx-
imately 20 seconds and
the indicator lamp in
the PARKTRONIC but-
ton lights up. PARKTRONIC has malfunctioned and has switched itself off.
X
If problems persist, have PARKTRONIC checked at a qualified
specialist workshop. Only the red segments
in the PARKTRONIC
warning display are lit.
PARKTRONIC is deacti-
vated after approx-
imately 20 seconds. The PARKTRONIC sensors are dirty or there is interference.
X
Clean the PARKTRONIC sensors (Y page 243).
X Switch the ignition back on. Troubleshooting
293Practical advice
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 293 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:13; WK
E 200 CGI BlueEFFICIENCY /
E 250 CGI BlueEFFICIENCY /
E 300
69
/
E 350 CGI BlueEFFICIENCY /
E 350 4MATIC /
E 500 / E 500 4MATIC /
E 200 CDI BlueEFFICIENCY /
E 220 CDI BlueEFFICIENCY /
E 250 CDI BlueEFFICIENCY /
E 350 CDI BlueEFFICIENCY /
E 350 BlueTEC /
E 350 CDI 4MATIC BlueEFFICIENCY 17" BA Summer tyres
245/45 R17 95W
Summer tyres
70 245/45 R17 95W MOExtended
Light-alloy wheels
8.0J x 17 H2 ET 48 or
8.5J x 17 H2 ET 48
17" BA Winter tyres
245/45 R17 95H M+S
i Winter tyres
70 245/45 R17 95H M+S MOExtended
i Light-alloy wheels
8.0J x 17 H2 ET 48 or
8.5J x 17 H2 ET 48
69
Only for certain countries.
70 Tyres with run-flat characteristics and only in combination with the tyre pressure loss warning or tyre pressure
monitor* activated. Tyres and wheels
351Technical data
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 351 Z
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:35; WK
Estate
i
BA: Both axles E 250
CDI BlueEFFICIENCY E 350 CGI
BlueEFFICIENCY
E 350
CDI BlueEFFICIENCY
16" BA Summer tyres
225/55 R16 99W XL 225/55 R16 99Y XL
Winter tyres
225/55 R16 99H XL
M+S
i 225/55 R16 99H XL
M+S
i Light-alloy wheels
7.5J x 16 H2 ET 45.5 or
8.0J x 16 H2 ET 46 7.5J x 16 H2 ET 45.5 or
8.0J x 16 H2 ET 46 E 350 CGI BlueEFFICIENCY
E 250 CDI BlueEFFICIENCY
E 350 CDI BlueEFFICIENCY 17" BA Summer tyres
245/45 R17 99Y XL
Summer tyres
71 245/45 R17 99Y XL MOExtended
Light-alloy wheels
8.0J x 17 H2 ET 48 or
8.5J x 17 H2 ET 48
BA Winter tyres
245/45 R17 99H XL M+S
i Winter tyres
71 245/45 R17 99H XL M+S MOExtended
iLight-alloy wheels
8.0J x 17 H2 ET 48 or
8.5J x 17 H2 ET 48
71
Tyres with run-flat characteristics and only in combination with the tyre pressure loss warning or tyre pressure
monitor* activated. 352
Tyres and wheelsTechnical data
* optional
212_AKB; 2; 4, en-GB
mkalafa,
Version: 2.11.8.1 2009-05-05T14:17:16+02:00 - Seite 352
Dateiname: 6515346702_buchblock.pdf; erzeugt am 07. May 2009 14:17:35; WK