
Display messagesPossible causes/consequences and M Solutions¸Replace 
Air FilterThe air filter is clogged.XHave the air filter checked at an authorized Mercedes-Benz
Center.!Check 
Fuel 
FilterThere is water in the fuel filter.XHave the water drained at an authorized Mercedes-Benz
Center as soon as possible.ØCheck 
Additive 
See 
Operator's
 ManualThe AdBlue ®
 supply is almost depleted.XHave the AdBlue ®
 tank refilled as soon as possible
( Y  page 333).
Contact an authorized Mercedes-Benz Center.ØRemaining 
Starts: 20The AdBlue ®
 supply has dropped to the minimum level.XHave the AdBlue ®
 tank refilled immediately ( Y page 333).
Contact an authorized Mercedes-Benz Center.i When the message  Remaining 
Starts: 20  appears in the multifunction
display, you can start the engine 20 more
times. If you do not add AdBlue ®
, the
engine cannot be started beyond that
point. Therefore, fill the AdBlue ®
 tank withapproximately 1 gal (3.79 l) AdBlue ®
(corresponds to approximately 2 refill
containers AdBlue ®
) or have the AdBlue ®
tank filled at an authorized Mercedes-Benz
Center. After AdBlue ®
 was refilled, the
engine can be started again.
Lamps
Display messagesPossible causes/consequences and  M SolutionsbActive 
Headlamps 
Inoperativ
eThe active Bi-Xenon headlamp system is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.bAdaptive 
Highbeam 
Assist 
Inoperativ
eThe Adaptive Highbeam Assist is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.Vehicle status messages in the multifunction display299Practical hints212_AKB; 2; 41, en-USd2ureepe,Version: 2.11.8.12009-07-17T09:14:21+02:00 - Seite 299Z 

Display messagesPossible causes/consequences and M SolutionsbCheck 
Left 
Daytime 
Running 
Light
or
Check 
Right 
Daytime 
Running 
LightThe left or right daytime running lamps are malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.bCheck 
Left 
Reverse 
Lamp
or
Check 
Right 
Reverse 
LampThe left or right backup lamp is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.bCheck 
Center 
Brake LampThe high-mounted brake lamp is malfunctioning. This
message will only appear if all LEDs have stopped working.XContact an authorized Mercedes-Benz Center as soon as
possible.bCheck 
Left Fog 
Lamp
or
Check 
Right Fog 
LampThe left or right front fog lamp is malfunctioning. This message
will only appear if all LEDs have stopped working.XContact an authorized Mercedes-Benz Center as soon as
possible.bCheck 
Front 
Left 
Sidemarker
 Lamp
or
Check 
Front 
Right 
Sidemarker
 LampThe front left side or right side marker lamp is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.300Vehicle status messages in the multifunction displayPractical hints
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Display messagesPossible causes/consequences and M SolutionsbCheck 
Rear Left 
Sidemarker
 Lamp
or
Check 
Rear 
Right 
Sidemarker
 LampThe rear left side or right side marker lamp is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.bCheck 
Front 
Left 
Parking 
Lamp
or
Check 
Front 
Right 
Parking 
LampThe left or right front parking lamp is malfunctioning.XHalogen headlamp:  Replace the bulb as soon as possible
( Y  page 318).XBi-Xenon headlamp:  Contact an authorized Mercedes-
Benz Center as soon as possible.bCheck 
Left High 
Beam
or
Check 
Right 
High BeamThe left or right high-beam lamp is malfunctioning.XHalogen headlamp:  Replace the bulb as soon as possible
( Y  page 318).XBi-Xenon headlamp:  Contact an authorized Mercedes-
Benz Center as soon as possible.bCheck 
Left 
License 
Plate Lamp
or
Check 
Right 
License 
Plate LampThe left or right license plate lamp is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.Vehicle status messages in the multifunction display301Practical hints212_AKB; 2; 41, en-USd2ureepe,Version: 2.11.8.12009-07-17T09:14:21+02:00 - Seite 301Z 

Display messagesPossible causes/consequences and M SolutionsbAuto Lamp 
Function 
Inoperativ
eThe light sensor is malfunctioning. The headlamps come on
automatically.XContact an authorized Mercedes-Benz Center as soon as
possible.
To switch off the headlamps (U.S. vehicles only):
XSwitch off the daytime running lamp mode in the control
system ( Y page 141).XSwitch off the headlamps using the exterior lamp switch
( Y  page 97).bCheck 
Left Low 
Beam
or
Check 
Right Low 
BeamThe left or right low-beam lamp is malfunctioning.XHalogen headlamp:  Replace the bulb as soon as possible
( Y  page 318).XBi-Xenon headlamp:  Contact an authorized Mercedes-
Benz Center as soon as possible.bCheck 
Rear Left 
Fog LampThe rear fog lamp is malfunctioning. This message will only
appear if all LEDs have stopped working.XContact an authorized Mercedes-Benz Center as soon as
possible.bSwitch 
Off LightsYou have removed the SmartKey from the starter switch,
opened the driver’s door and left the headlamps on or
removed the SmartKey with KEYLESS-GO from the vehicle
and left the headlamps on.XTurn the exterior lamp switch to  $ or c
( Y  page 97).
or
XWith the fog lamps switched on:  Push in the exterior
lamp switch to its stop.bCheck 
Left Tail 
and Brake 
Lamps
or
Check 
Right 
Tail and 
Brake 
LampsThe left or right tail lamp/brake lamp is malfunctioning. This
message will only appear if all LEDs have stopped working.XContact an authorized Mercedes-Benz Center as soon as
possible.302Vehicle status messages in the multifunction displayPractical hints
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Display messagesPossible causes/consequences and M SolutionsbCheck 
Left 
Cornering 
Light
or
Check 
Right 
Cornering 
LightThe left or right corner-illuminating lamp is malfunctioning.XReplace the bulb as soon as possible ( Y page 318).bCheck 
Rear Left 
Turn 
Signal
or
Check 
Rear 
Right 
Turn 
SignalThe left or right rear turn signal lamp is malfunctioning.XContact an authorized Mercedes-Benz Center as soon as
possible.bCheck 
Front 
Left Turn 
Signal
or
Check 
Front 
Right 
Turn 
SignalThe left or right front turn signal lamp is malfunctioning.XReplace the bulb as soon as possible ( Y page 318).bCheck 
Left 
Mirror 
Turn 
Signal
or
Check 
Right 
Mirror 
Turn 
SignalThe turn signal in the left or right exterior rear view mirror is
malfunctioning. This message will only appear if all LEDs have
stopped working.XContact an authorized Mercedes-Benz Center as soon as
possible.Vehicle status messages in the multifunction display303Practical hints212_AKB; 2; 41, en-USd2ureepe,Version: 2.11.8.12009-07-17T09:14:21+02:00 - Seite 303Z 

TiresDisplay messagesPossible causes/consequences and M SolutionshTire 
Press. 
Warning 
Caution 
Tire 
Malfunctio
nAt least one tire is deflating.XCarefully bring the vehicle to a halt, avoiding abrupt
steering and braking maneuvers.XIf necessary, change the wheel ( Y page 323).hCheck 
Tire 
PressureThe tire inflation pressure in at least one tire is significantly
below the reference value.XCarefully bring the vehicle to a halt, avoiding abrupt
steering and braking maneuvers.XCheck and adjust tire inflation pressure as required.XIf necessary, change the wheel ( Y page 323).GWarning!
Do not drive with a flat tire. A flat tire affects the ability to steer or brake the vehicle. You may
lose control of the vehicle. Continued driving with a flat tire will cause excessive heat build-up
and possibly a fire.
GWarning!
Follow recommended tire inflation pressures.
Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect
handling and fuel economy, and are more likely to fail from being overheated.
Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear
unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are
more likely to become punctured or damaged by road debris, potholes etc.
What to do if …
Lamps in instrument cluster
Notes
If any of the following lamps in the instrument
cluster fails to come on during the bulb self-
check when switching on the ignition, have
the respective bulb checked and replaced if
necessary.
When you switch on the ignition, all lamps in
the instrument cluster come on. The low-
beam headlamp indicator lamp, high-beam
headlamp indicator lamp, turn signal
indicator lamps, and the indicator lamps for
the fog lamps will only come on if activated.
If a lamp in the instrument cluster fails to
come on when the ignition is switched on,
have it checked and replaced if necessary.304What to do if …Practical hints
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BrakeProblemPossible causes/consequences and M Solutions!The yellow ABS
indicator lamp
comes on while
the engine is
running.The brake system is still functioning normally but due to a
malfunction, the ABS, the BAS, the BAS PLUS, the ESC, the
hill-start assist system, the HOLD function, the PRE-SAFE ®
system, and the PRE-SAFE ®
 Brake are unavailable.
The ATTENTION ASSIST is disabled.XContinue driving with added caution. Wheels may lock during
hard braking, reducing steering capability.XAdjust driving to be consistent with reduced braking
responsiveness.XRead and observe messages that may appear in the
multifunction display ( Y page 272).XHave the system checked at an authorized Mercedes-Benz
Center as soon as possible.
Failure to follow these instructions increases the risk of an
accident.
ä
å
!
The yellow ESC warning
lamp, the yellow ESC
OFF warning lamp, and
the yellow ABS
indicator lamp come on
while the engine is
running and an
acoustic warning
sounds.The Electronic Brake Proportioning (EBP) switched off due to a
malfunction.
The ABS, the BAS, the BAS PLUS, the ESC, the hill-start assist
system, the HOLD function, the PRE-SAFE ®
 system, and the
PRE-SAFE ®
 Brake are also switched off.
The brake system is still functioning normally but without the
systems specified above available.
The ATTENTION ASSIST is disabled.XContinue driving with added caution. Wheels may lock during
hard braking, reducing steering capability.XAdjust driving to be consistent with reduced braking
responsiveness.XRead and observe messages that may appear in the
multifunction display ( Y page 272).XHave the system checked at an authorized Mercedes-Benz
Center as soon as possible.
Failure to follow these instructions increases the risk of an
accident.
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ProblemPossible causes/consequences and M Solutions$  (USA only)
J  (Canada only)
The red brake warning
lamp comes on while
driving.The brake system is malfunctioning. Braking characteristics may
be impaired.
Risk of accident!XDo not drive any further. Stop the vehicle in a safe location as
soon as it is safe to do so.XEngage the parking brake.XRead and observe messages that may appear in the
multifunction display ( Y page 272).XContact an authorized Mercedes-Benz Center.$  (USA only)
J  (Canada only)
The red brake warning
lamp comes on while
driving and an acoustic
warning sounds.You are driving with the parking brake engaged.XRelease the parking brake.$  (USA only)
J  (Canada only)
The red brake warning
lamp comes on while
the engine is running
and an acoustic
warning sounds.There is insufficient brake fluid in the reservoir.
Risk of accident!XDo not drive any further. Stop the vehicle in a safe location as
soon as it is safe to do so.XEngage the parking brake.XRead and observe messages that may appear in the
multifunction display ( Y page 272).XContact an authorized Mercedes-Benz Center.
Do not add brake fluid! This will not solve the problem.
GWarning!
Driving with the brake warning lamp
illuminated can result in an accident. Have
your brake system checked immediately if the
brake warning lamp stays on. Do not add
brake fluid before checking the brake system.
Overfilling the brake fluid reservoir can result
in spilling brake fluid on hot engine parts and
the brake fluid catching fire. You can be
seriously burned.
!  If you find that the brake fluid in the brake
fluid reservoir has fallen to the minimum
mark or below, have the brake system
checked for brake pad thickness and leaks.306What to do if …Practical hints
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