2014-2021 Mercedes C Class 4 Door Display messages and warning/indicator lamps -> Warning and indicator lamps User Manual
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Display messages and warning/indicator lamps -> Warning and indicator lamps for Your Mercedes C Class 4 Door Fourth Generation (2014-2021)

Display messages and warning/indicator lamps 499  
Display messages  
Possible causes/consequences and M Solutions  
* Display message only for certain engines:  
The oil pressure is too low.  
5
NOTE Engine damage caused by driving with insufficient oil pressure  
*
Engine oil pressure Stop  
Switch off engine  
#
Avoid driving with insufficient oil pressure.  
#
#
Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving.  
Consult a qualified specialist workshop.  
* The electrical connection to the oil level sensor has been interrupted or the oil level sensor is faulty.  
#
Consult a qualified specialist workshop.  
5
Engine oil level cannot be  
measured  
warning lamps indicate a malfunction only if they  
light up or flash after the engine has been star‐  
ted or during a journey.  
Warning and indicator lamps  
Overview of indicator and warning lamps  
Some systems will perform a self-test when the  
ignition is switched on. Some indicator and  
warning lamps may briefly light up or flash. This  
behaviour is non-critical. These indicator and  
500 Display messages and warning/indicator lamps  
Instrument display (standard)  
Depending on the display setting, the positions  
of the indicator lamps on the instrument display  
may differ from the example shown.  
ä
ä
AIRMATIC (/ page 509)  
DYNAMIC BODY CONTROL  
(/ page 509)  
Indicator and warning lamps:  
ABS (/ page 510)  
!
÷
å
h
Restraint system (/ page 501)  
6
ESP® (/ page 510)  
ESP® OFF (/ page 510)  
Tyre pressure monitoring system  
(/ page 512)  
Standing lights (/ page 120)  
Low beam (/ page 120)  
High beam (/ page 122)  
Turn signal light (/ page 122)  
Rear fog light (/ page 120)  
Seat belt (/ page 501)  
ü
ï
Ù
ÿ
;
%
#
8
Trailer hitch (/ page 502)  
Power steering (/ page 502)  
Coolant temperature (/ page 504)  
Engine diagnostics (/ page 504)  
Preglow  
Electrical fault (/ page 504)  
Reserve fuel with fuel filler flap loca‐  
tion indicator (/ page 504)  
T
L
Widescreen cockpit instrument display  
K
#!  
R
Electric parking brake (red)  
!
!
(/ page 507)  
Electric parking brake (yellow)  
(/ page 507)  
Brakes (yellow) (/ page 507)  
Brakes (red) (/ page 507)  
Distance warning (/ page 509)  
J
J
L
Display messages and warning/indicator lamps 501  
Occupant safety  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The red restraint system warning lamp is lit while the engine is running.  
*The restraint system is malfunctioning (/ page 36).  
6
&
WARNING Risk of injury due to malfunctions in the restraint system  
Restraint system warning  
lamp  
Components in the restraint system may be activated unintentionally or not deploy as intended in an accident.  
#
Have the restraint system checked and repaired immediately at a qualified specialist workshop.  
#
Drive on carefully.  
#
#
Note the messages on the multifunction display.  
Consult a qualified specialist workshop immediately.  
The red seat belt warning lamp flashes and an intermittent warning tone sounds.  
or  
ü
The red seat belt warning lamp lights up once the engine has started.  
In addition, an intermittent warning tone may sound.  
Seat belt warning lamp  
The red seat belt warning lamp flashes and an intermittent warning tone sounds:  
*
The driver or front passenger has not fastened his or her seat belt while the vehicle is in motion.  
#
Fasten your seat belt (/ page 39).  
502 Display messages and warning/indicator lamps  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
There are objects on the front passenger seat.  
#
Remove the objects from the front passenger seat.  
The red seat belt warning lamp lights up once the engine has started:  
In addition, an intermittent warning tone may sound.  
*
The red seat belt warning lamp reminds the driver and front passenger to fasten their seat belts.  
#
Fasten your seat belt (/ page 39).  
If you have placed objects on the front passenger seat, the red seat belt warning lamp may remain lit.  
Vehicle  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The red trailer hitch warning lamp is lit.  
*The trailer hitch is not operational or is swivelling.  
ï
&
WARNING Risk of an accident if the ball neck is not locked  
Trailer tow hitch warning  
lamp  
The trailer may become detached.  
#
Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving.  
#
Uncouple the trailer and secure it against rolling away.  
Display messages and warning/indicator lamps 503  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
#
Initiate a new swivel movement and do not re-couple the trailer until the warning/indicator lamp goes out.  
#
Note the messages on the multifunction display.  
If the trailer hitch is swivelling:  
#
Wait until the ball neck has reached the operational position.  
The red power steering system warning lamp is lit while the engine is running.  
*The power assistance or the steering itself is malfunctioning.  
Ù
&
WARNING Risk of accident if steering capability is impaired  
Power steering warning  
lamp (red)  
If the steering does not function as intended, the vehicle's operating safety is jeopardised.  
#
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do  
not continue driving under any circumstances.  
#
Consult a qualified specialist workshop.  
#
Note the messages on the multifunction display.  
504 Display messages and warning/indicator lamps  
Engine  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The red coolant warning lamp is lit while the engine is running.  
*Possible causes:  
ÿ
R
The temperature sensor is malfunctioning  
Coolant warning lamp  
R
The coolant level is too low  
R
The air supply to the radiator is obstructed  
R
The radiator fan is faulty  
If there is an additional warning tone, the coolant temperature has exceeded 120 °C.  
&
WARNING Danger of burns when opening the bonnet  
If you open the engine bonnet when the engine has overheated or during a fire in the engine compartment, you  
could come into contact with hot gases or other escaping operating fluids.  
#
Before opening the bonnet, allow the engine to cool down.  
#
In the event of a fire in the engine compartment, keep the engine bonnet closed and call the fire service.  
#
Stop the vehicle immediately in accordance with the traffic conditions and switch off the engine. Do not continue  
driving.  
#
Note the messages on the multifunction display.  
If the coolant temperature display is at the lower end of the temperature scale:  
Display messages and warning/indicator lamps 505  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
#
Consult a qualified specialist workshop.  
or  
#
Exit the vehicle and keep a safe distance from it until the engine has cooled down.  
Check the coolant level (/ page 377).  
Make sure that the air supply to the radiator is not obstructed.  
Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the  
coolant temperature display remains below 120 °C.  
#
#
#
The yellow engine diagnostics warning lamp is lit while the engine is running.  
*A malfunction has occurred in the engine, the exhaust system or the fuel system.  
The emissions limit value may have been exceeded and the engine may be running in emergency operation mode.  
;
Engine diagnosis warning  
lamp  
#
Have the vehicle checked as soon as possible at a qualified specialist workshop.  
*Vehicles with a diesel engine: the fuel tank may have been run dry.  
#
Start the engine three to four times after refuelling.  
If the yellow engine diagnosis warning lamp goes out, emergency operation mode is cancelled. The vehicle need  
not be checked.  
506 Display messages and warning/indicator lamps  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The red electrical fault warning lamp is lit.  
* There is a fault in the electrics.  
#
#
Note the messages on the multifunction display.  
Electrical fault warning  
lamp  
The yellow fuel reserve warning lamp lights up while the engine is running.  
* The fuel supply has dropped into the reserve range.  
8
#
Refuel.  
Fuel reserve warning lamp  
lights up  
Display messages and warning/indicator lamps 507  
Brakes  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The red electric parking brake indicator lamp flashes or is lit.  
The yellow electric parking brake indicator lamp also lights up in the event of a malfunction.  
!
#
*
Note the messages on the multifunction display.  
Electric parking brake indi‐  
cator lamp (red)  
!
The electric parking brake  
(yellow) indicator lamp  
The yellow brake system warning lamp is lit while the engine is running.  
*
&
WARNING Risk of an accident due to a brake system malfunction  
J
If the brake system is malfunctioning, braking characteristics may be impaired.  
Brake system warning lamp  
(yellow)  
#
Drive on carefully.  
#
Have the brake system checked immediately at a qualified specialist workshop.  
#
Adjust your speed and drive on carefully, leaving a suitable distance to the vehicle in front.  
If the multifunction display shows a display message, observe it.  
#
508 Display messages and warning/indicator lamps  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
#
Consult a qualified specialist workshop.  
The red brake system warning lamp is lit while the engine is running.  
*Possible causes:  
J
R
The brake force boosting is malfunctioning and the braking characteristics may be affected.  
Brake system warning lamp  
(red)  
R
There is insufficient brake fluid in the brake fluid reservoir.  
#
Note the messages on the multifunction display.  
&
WARNING Risk of accident and injury if brake force boosting is malfunctioning  
If brake force boosting is malfunctioning, increased brake pedal force may be necessary for braking. The braking  
characteristics may be impaired. The braking distance can increase in emergency braking situations.  
#
Stop in a safe location immediately. Do not continue driving!  
#
Consult a qualified specialist workshop.  
&
WARNING Risk of an accident due to low brake fluid level  
If the brake fluid level is too low, the braking effect and the braking characteristics may be impaired.  
#
Stop the vehicle as soon as possible, paying attention to road and traffic conditions. Do not continue driv‐  
ing.  
#
Consult a qualified specialist workshop.  
Display messages and warning/indicator lamps 509  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
#
Do not top up the brake fluid.  
Driving systems  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The red distance warning lamp lights up while the vehicle is in motion.  
*The distance to the vehicle in front is too small for the speed selected.  
If there is an additional warning tone, you are approaching an obstacle at too high a speed.  
L
Warning lamp for distance  
warning function  
#
Be prepared to brake immediately.  
#
Increase the distance.  
Function of Active Brake Assist (/ page 189).  
The yellow AIRMATIC warning lamp is lit.  
The yellow DYNAMIC BODY CONTROL warning lamp is lit.  
* A fault has occurred in the AIRMATIC.  
A fault has occurred in the DYNAMIC BODY CONTROL.  
ä
Suspension warning lamp  
(yellow)  
#
Note the messages on the multifunction display.  
510 Display messages and warning/indicator lamps  
Driving safety systems  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The yellow ABS warning lamp is lit while the engine is running.  
*ABS is malfunctioning.  
If there is an additional warning tone, EBD is malfunctioning.  
Other driving systems and driving safety systems may also be malfunctioning.  
!
ABS warning lamp  
#
Note the messages on the multifunction display.  
&
WARNING There is a risk of skidding if EBD or ABS is malfunctioning  
The wheels may lock during braking.  
The steerability and braking characteristics are heavily impaired and the braking distance may increase. In addi‐  
tion, other driving safety systems are switched off.  
#
Drive on carefully.  
#
Have the brake system checked immediately at a qualified specialist workshop.  
The yellow ESP® warning lamp flashes while the vehicle is in motion.  
or  
÷
The yellow ESP® warning lamp is lit while the engine is running.  
ESP® warning lamp  
®
*
The yellow ESP warning lamp flashes while the vehicle is in motion:  
One or more wheels has reached its grip limit (/ page 186).  
Display messages and warning/indicator lamps 511  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
#
Adapt your driving style to suit the road and weather conditions.  
®
*
The yellow ESP warning lamp is lit while the engine is running.  
ESP® is malfunctioning.  
Other driving systems and driving safety systems (e.g. BAS) may also be malfunctioning.  
#
Note the messages on the multifunction display.  
WARNING Risk of skidding if ESP® is malfunctioning  
&
If ESP® is malfunctioning, ESP® cannot carry out vehicle stabilisation. In addition, other driving safety systems  
are switched off.  
#
Drive on carefully.  
Have ESP® checked at a qualified specialist workshop.  
#
The yellow ESP® OFF warning lamp is lit while the engine is running.  
ESP® is deactivated.  
*
å
Other driving systems and driving safety systems may also be inoperative.  
ESP® OFF warning lamp  
WARNING Risk of skidding when driving with ESP® deactivated  
&
ESP® does not act to stabilise the vehicle. The availability of further driving safety systems is also limited.  
#
Drive on carefully.  
512 Display messages and warning/indicator lamps  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
Deactivate ESP® only for as long as the situation requires.  
#
If ESP® cannot be activated, ESP® is malfunctioning.  
Have ESP® checked immediately at a qualified specialist workshop.  
#
Observe the notes on deactivating ESP® (/ page 186).  
#
Tyre pressure monitor  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction) flashes for approximately one minute and  
then remains lit.  
or  
h
Tyre pressure monitoring  
system warning lamp  
The yellow tyre pressure monitoring system warning lamp (pressure loss/malfunction) is lit.  
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction) flashes for approximately one  
minute and then remains lit:  
*
The tyre pressure monitor is malfunctioning.  
Display messages and warning/indicator lamps 513  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
&
WARNING There is a risk of an accident if the tyre pressure monitoring system is malfunctioning  
The tyre pressure monitoring system cannot issue a warning if there is pressure loss in one or more of the tyres.  
Tyres with insufficient tyre pressure may impair the driving characteristics as well as steering and braking.  
#
Have the tyre pressure monitoring system checked at a qualified specialist workshop.  
The yellow tyre pressure monitoring system warning lamp (pressure loss/malfunction) is lit:  
*
The tyre pressure monitoring system has detected tyre pressure loss in at least one of the tyres.  
&
WARNING Risk of an accident due to insufficient tyre pressure  
R
R
R
The tyres can burst.  
The tyres can wear excessively and/or unevenly.  
The driving characteristics as well as the steering and braking may be greatly impaired.  
You could then lose control of the vehicle.  
#
Observe the recommended tyre pressures.  
#
Adjust the tyre pressure if necessary.  
#
Stop the vehicle in accordance with the traffic conditions.  
Check the tyre pressure and the tyres.  
#

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