Display messages Possible causes/consequences and
M
MSolutions b
Check Front Left Check Front Left
Sidemarker Lamp Sidemarker Lamp
or
Check Front Right Check Front Right
Sidemarker Lamp Sidemarker Lamp The left or right front side marker lamp is defective.
X
Visit a qualified specialist workshop. b
Check Rear Left Check Rear Left
Sidemarker Lamp Sidemarker Lamp
orCheck Rear Right
Check Rear Right
Sidemarker Lamp Sidemarker Lamp The rear left or right side marker lamp is defective.
X
Visit a qualified specialist workshop. b
Check Front Left Check Front Left
Parking Lamp Parking Lamp
or
Check Front Right Check Front Right
Parking Lamp Parking Lamp The front left or front right parking or standing lamp is defective.
X
Visit a qualified specialist workshop. b
Switch Off Lights Switch Off Lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to Ã.b
Malfunction See Malfunction See
Operator's Manual Operator's Manual The exterior lighting is defective.
X
Visit a qualified specialist workshop. Engine
G
WARNING
Driving when your engine is overheated can cause some fluids which may have leaked into the
engine compartment to catch fire. You could be seriously burned.
Steam from an overheated engine can cause serious burns which can occur just by opening the
engine hood. Stay away from the engine if you see or hear steam coming from it.
Stop the vehicle in a safe location away from other traffic. Turn off the engine, get out of the
vehicle and do not stand near the vehicle until the engine has cooled down. G
WARNING
Do not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which may burn
if it comes into contact with hot engine parts. You could be seriously burned. 172
Displays and operationOn-board compu
ter and displays
ProCarManuals.com
Display messages Possible causes/consequences and
M
MSolutions ?
Coolant Low Stop Coolant Low Stop
Vehicle Turn Vehicle Turn
Engine Off Engine Off The coolant is too hot. In addition, the
?warning lamp in the
instrument cluster lights up and a warning tone sounds.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Make sure that the air supply to the radiator is not blocked, e.g.
by snow, slush or ice.
X Wait until the display message disappears before restarting the
engine. Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the coolant temperature increases again, visit a qualified
specialist workshop immediately.
! If the coolant temperature is over 248 ‡ (120 †), do not
continue driving. The engine will otherwise be damaged. The poly-V-belt may have torn. A warning tone also sounds.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Check the poly-V-belt.
X If the poly-V-belt is not damaged: do not start the engine
again until the display message disappears. Otherwise, the
engine could be damaged.
X If the poly-V-belt is torn: do not continue driving. Consult a
qualified specialist workshop. ? The engine fan is defective.
X
At coolant temperatures below 248 ‡ (120 †), 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 driving. Displays and operation
173On-board computer and displays Z
ProCarManuals.com
Display messages Possible causes/consequences and
M
MSolutions # The battery is not being charged.
A warning tone also sounds.
Possible causes are:
R
a defective alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull over and stop the vehicle safely paying attention to road
and traffic conditions and switch off the engine.
X Open the hood.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is not damaged:
X Visit a qualified specialist workshop. +
Check Coolant Check Coolant
Level See Level See
Operator's Manual Operator's Manual The coolant level is too low.
X
Add coolant, observing the warning notes before doing so
(Y page 216).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at a qualified specialist
workshop.
! The coolant level is too low. Avoid making long journeys with
too little coolant in the cooling system. The engine will otherwise
be damaged.
The display messages and the corresponding symbol that
indicate that the coolant level is too low must not be ignored. 4
Engine Oil Level Engine Oil Level
low Stop Vehicle low Stop Vehicle
Turn Engine Off Turn Engine Off There is insufficient oil in the engine. There is a risk of engine
damage.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Top up and check the engine oil level (Y page 215).174
Displays and operationOn-board compu
ter and displays
ProCarManuals.com
Display messages Possible causes/consequences and
M
MSolutions 4
Check Engine Oil Check Engine Oil
Level Level
(Add 1
(Add 1 Liter)
Liter) The oil level is too low.
X
Check the oil level (Y page 215).
X If necessary, add engine oil.
X Have the engine checked for leaks if you need to add engine oil
more often than usual.
Information on approved engine oils can be obtained from any
qualified specialist workshop or on the Internet at http://
www.mbusa.com (USA only).
! The oil level is too low. Avoid long journeys with too little engine
oil. There is a risk of engine damage.
The display messages and the corresponding symbol that
indicate that the oil level is too low must not be ignored. 4
Engine Oil Level Engine Oil Level
Too High Too High You have added too much engine oil. The engine or catalytic
converter may be damaged.
X
Siphon off excess engine oil until it is at the specified level.
Observe the legal requirements. 4
Engine Oil Level Engine Oil Level
Cannot Be Measured Cannot Be Measured The measuring system is faulty.
X
Visit a qualified specialist workshop. 4
Engine Oil Engine Oil
Pressure Control Pressure Control
See Operator's See Operator's
Manual Manual The oil pressure sensor has reported a malfunction.
The oil pressure control is in emergency mode.
The engine lubrication is guaranteed.
X
Visit a qualified specialist workshop. 4
Engine Oil Engine Oil
Pressure Stop Pressure Stop
Vehicle Turn Vehicle Turn
Engine Off Engine Off
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Check the engine oil level (Y page 215) and top up if necessary.
X If there are visible signs of oil loss from the vehicle, consult a
qualified specialist workshop. C There is only a small amount of fuel in the fuel tank.
X
Refuel at the nearest gas station. 8
Fuel Level Low Fuel Level Low The fuel level has fallen below the reserve range.
X
Refuel at the nearest gas station. Displays and operation
175On-board computer and displays Z
ProCarManuals.com
Display messages Possible causes/consequences and
M
MSolutions 8
Gas Cap Loose Gas Cap Loose 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.
If the fuel filler cap is not correctly closed:
X Close the fuel filler cap.
If the fuel filler cap is correctly closed:
X Visit a qualified specialist workshop. ¸
Replace Air Filter Replace Air Filter The air filter is dirty and must be replaced.
X
Visit a qualified specialist workshop. !
Check Fuel Filter Check Fuel Filter Vehicles with a diesel engine: there is water in the fuel filter. The
water must be drained off.
X
Visit a qualified specialist workshop. Driving systems
Display messages Possible causes/consequences and
M MSolutions Cruise Control
Cruise Control
Inoperative Inoperative Cruise control is defective.
A warning tone also sounds.
X
Visit a qualified specialist workshop. Cruise Control Cruise Control
--- mph --- mph A condition for activating cruise control has not been fulfilled.
You attempted to save a speed of less than 20 mph
(30 km/h).
X Activate ESP ®
(Y page 56).
X If the situation allows, drive faster than 20 mph (30 km/h) and
save the speed.
X Check the activation conditions for cruise control
(Y page 134). 176
Displays and operationOn-board computer and displays
ProCarManuals.com
Display messages Possible causes/consequences and
M
MSolutions Blind Spot Assist
Blind Spot Assist
Inoperative Inoperative Blind Spot Assist is defective.
The yellow
9indicator lamps also light up in the exterior
mirrors.
X Visit a qualified specialist workshop. Blind Spot Assist Blind Spot Assist
Currently Currently
Unavailable See Unavailable See
Operator's Manual Operator's Manual Blind Spot Assist is temporarily inoperative if:
R
the sensors are dirty.
R its function is impaired due to heavy rain or snow.
R the radar sensor system is outside the operating temperature
range.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
The yellow 9indicator lamps also light up in the exterior
mirrors.
Blind Spot Assist is operational again and the display message
disappears if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects that the sensors are fully available again.
R the radar sensor system is back within the operating
temperature range.
If the display message continues to be displayed:
X Clean the sensors (Y page 224).
X Restart the engine. Tires
G
WARNING
Tires with tire pressures that are too low or too high are associated with the following hazards:
R they can burst, in particular if the vehicle is heavily laden or when driven at high speeds.
R the tires can wear excessively and/or unevenly, which can severely impair tire traction.
R the driving, steering and braking characteristics may be severely impaired.
There is a risk of accident.
Follow recommended tire inflation pressures and check the pressure of all the tires including the
spare wheel:
R monthly, at least
R if the load changes
R before beginning a long journey
R under different operating conditions, e.g. off-road driving
If necessary, correct the tire pressure. Displays and operation
177On-board computer and displays Z
ProCarManuals.com
Vehicle
Display messages Possible causes/consequences and
M
MSolutions N The trunk lid is open.
X
Close the trunk lid. L The hood is open.
G WARNING
The open hood may block your view when the vehicle is in motion.
There is a risk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Close the hood. ´(Coupe only)
C(Roadster
only) At least one door is open.
X
Close the doors. K
Convertible Top Convertible Top
Operation Operation
Possible
Possible
to 31 mph
to 31 mph If you drive at speeds of more than 31 mph (50 km/h), you cannot
open or close the soft top.
X
Fully open or close the soft top (Y page 77).K
Convertible Top Convertible Top
Opening/Closing Opening/Closing
Not Finished Not Finished The soft top is not fully opened or closed. The hydraulics are
depressurized.
X Fully open or close the soft top (Y page 77).K
Open/Close Open/Close
Convertible Top Convertible Top
Completely Completely The roof is not locked. If you drive at speeds of more than
31 mph (50 km/h), you cannot open or close the soft top.
X
If you are driving at speeds of more than 31 mph (50 km/h),
reduce your speed.
X Push or pull the soft-top switch (Y page 77) until the soft top is
fully open or closed. K
Convertible Convertible
Top
Topin
in
Operation Please
Operation Please
Wait Wait The on-board voltage is too low.
X Start the engine. 180
Displays and operationOn-board computer and displays
ProCarManuals.com
Display messages Possible causes/consequences and
M
MSolutions The soft top has been opened and closed several times in a row.
The soft-top drive has been switched off automatically for safety
reasons.
You can open and close the soft top again after approximately ten
minutes.
X
Switch off the ignition and turn it back on.
X Repeat the opening or closing procedure (Y page 77).K
Depress Brake Depress Brake You have attempted to close the soft top with the soft top switch
while the vehicle was stationary.
X
Depress the brake pedal.
X Press the soft-top switch until the soft top is completely closed. ¥
Check Washer Fluid Check Washer Fluid The washer fluid level in the washer fluid reservoir has dropped
below the minimum.
X
Add washer fluid ( Ypage 217). SmartKey
Display messages Possible causes/consequences and
M MSolutions +
Replace Replace
Key
KeyBattery
Battery The SmartKey batteries are discharged.
X
Change the batteries ( Ypage 64). +
Key Not Detected Key Not Detected
(red display message) The SmartKey is not in the vehicle. A warning tone also sounds.
When you switch off the engine, you will be unable to restart it.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Locate the SmartKey. The SmartKey is not detected while driving because a powerful
radio transmitter is causing interference. A warning tone also
sounds.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Insert the SmartKey into the ignition lock and turn it to the
desired position ( Ypage 113). Displays and operation
181On-board computer and displays Z
ProCarManuals.com