Mercedes C240 owner's manual: What to do if

Published by Mercedes-Benz · pages 346–378 of 482 · Original PDF

20 discussions about the Mercedes C240

All 20 parts of the owner's manual

Practical hints

What to do if ...

Lamps in instrument cluster

General information:
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.

Problem Possible cause Suggested solution
The yellow ABS malfunction indicator lamp comes on while driving. The ABS has detected a malfunction and has switched off. The BAS and the ESP are also switched off (see messages in display).The brake system is still functioning normally but without the ABS available.If the ABS control unit is malfunctioning, other systems such as the navigation system* or the automatic transmission* may also be malfunctioning. ► Continue driving with added caution. Wheels may lock during hard braking, reducing steering capability.► Read and observe messages in the display (▷ page 352).► Have the system checked at an authorized Mercedes-Benz Center as soon as possible.Failure to follow these instructions increases the risk of an accident.
The charging voltage has fallen below ten volts. The ABS has switched off.The battery might not be charged sufficiently. ► Switch off electrical consumers that are currently not needed, e.g. seat heating*.► If necessary, have the generator (alternator) and battery checked.When the voltage is above this value again, the ABS is operational again.

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Problem Possible cause Suggested solution
BRAKE (USA only)(!) (Canada only) The red brake warning lamp comes on while driving and you hear a warning sound. You are driving with the parking brake set. ► Release the parking brake (▷ page 48).
The red brake warning lamp comes on while driving. There is insufficient brake fluid in the reservoir. ► Risk of accident! Carefully stop the vehicle and notify an authorized Mercedes-Benz Center. Do not add brake fluid! This will not solve the problem.

Warning!

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. Don’t 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.

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Problem Possible cause Suggested solution
check engine(USA only)engine(Canada only) The yellow engine malfunction indicator lamp comes on while driving. There is a malfunction in:• The fuel management system• The ignition system• The emission control system• Systems which affect emissionsSuch malfunctions may result in excessive emissions values and may switch the engine to its limp-home (emergency operation) mode. ▶ Have the vehicle checked as soon as possible by an authorized Mercedes-Benz Center.An on-board diagnostic connector is used by the service station to link the vehicle to the shop diagnostics system. It allows the accurate identification of system malfunctions through the readout of diagnostic trouble codes. It is located in the front left area of the footwell next to the parking brake pedal.

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Problem Possible cause Suggested solution
check engine (USA only)engine (Canada only) The yellow engine malfunction indicator lamp comes on while driving. A loss of pressure has been detected in the fuel system. The fuel cap may not be closed properly or the fuel system may be leaky. ► Check the fuel cap (▷ page 293).If it is not closed properly:► Close the fuel cap.If it is closed properly:► Have the fuel system checked by an authorized Mercedes-Benz Center.
Your fuel tank is empty. ► After refuelling start, turn off and restart the engine three or four times in succession.The limp-home mode is canceled. You do not need to have your vehicle checked.

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Problem Possible cause Suggested solution
The yellow ESP warning lamp comes on while driving. The ESP is deactivated.Risk of accident!Adapt your speed and driving to the prevailing road, weather and traffic conditions. ► Switch the ESP back on (▷ page 85).If the ESP cannot be switched back on, have the system checked at an authorized Mercedes-Benz Center as soon as possible.
The yellow ESP warning lamp flashes while driving. The ESP or traction control has come into operation because of detected traction loss in at least one tire. ► When driving off, apply as little throttle as possible.► While driving, ease up on the accelerator.► Adapt your speed and driving to the prevailing road and weather conditions.► Do not deactivate the ESP. Exceptions: (▷ page 85).Failure to follow these instructions increases the risk of an accident.

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Problem Possible cause Suggested solution
The yellow fuel tank reserve warning lamp in the fuel gauge (▷ page 24) comes on while driving. The fuel level has gone below the reserve mark. ▶ Refuel at the next gas station (▷ page 293).
The red seat belt telltale illuminates for a brief period after starting the engine. The telltale reminds you and your passengers to fasten seat belts. ▶ Fasten your seat belt. The telltale goes out.
The red seat belt telltale illuminates and a warning chime sounds for approximately six seconds after starting the engine. The driver’s seat belt is not fastened before the engine is started. ▶ Fasten the driver’s seat belt. The telltale goes out.
The red SRS indicator lamp comes on while driving. There is a malfunction in the restraint systems. The air bags or emergency tensioning devices (ETDs) could deploy unexpectedly or fail to deploy in an accident. ▶ Drive with added caution to the nearest authorized Mercedes-Benz Center.

Warning!

In the event a malfunction of the SRS is indicated as outlined above, the SRS may not be operational.

For your safety, we strongly recommend that you visit an authorized Mercedes-Benz Center immediately to have the system checked; otherwise the SRS may not be deployed when needed in an accident, which could result in serious or fatal injury, or it might deploy unexpectedly and unnecessarily which could also result in an accident and/or injury to you or to others.

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Lamp in center console

Problem Possible cause Suggested solution
The front passenger front air bag off indicator lamp illuminates and remains illuminated with the weight of a typical adult or someone larger than a small individual on the front passenger seat. The system is malfunctioning ▶ Have the system checked as soon as possible by an authorized Mercedes-Benz Center.▶ Also note any messages in the multifunction display and follow corrective steps (▷ page 354).

Warning!

If the indicator lamp illuminates and remains illuminated with the weight of a typical adult or someone larger than a small individual on the front passenger seat, do not have any passenger use the front passenger seat until the system has been repaired.


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Problem Possible cause Suggested solution
The front passenger front air bag off indicator lamp does not illuminate and/or does not remain illuminated with the weight of a typical 12-month-old child in a standard child restraint or less on the front passenger seat. The system is malfunctioning. ▶ Make sure that there is nothing between seat cushion and child seat and check installation of the child seat.▶ Make sure that no objects applying supplemental weight onto the seat are present.▶ If the front passenger front air bag off indicator lamp remains out, have the system checked as soon as possible by an authorized Mercedes-Benz Center. Do not transport a child on the front passenger seat until the system has been repaired.▶ Also note any messages in the multifunction display and follow corrective steps (▷ page 354).

Warning!

If the indicator lamp does not illuminate or remains out with the weight of a typical 12-month-old child in a standard child restraint or less on the front passenger seat, do not transport a child on the front passenger seat until the system has been repaired.

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Vehicle status messages in the multifunction display

Warning and malfunction messages appear in the multifunction display located in the instrument cluster.

Certain warning and malfunction messages are accompanied by an audible signal.

Address these messages accordingly and follow the additional instructions given in this Operator’s Manual.

Selecting the vehicle status message memory menu in the control system (▷ page 138) displays both cleared and uncleared messages.

High-priority messages appear in the multifunction display in red color.

Certain messages of high priority cannot be cleared from the multifunction display using the reset button (▷ page 126) or button ◁, ▷, ⌂, or ⌘ on the steering wheel.

Other messages of high priority and messages of less immediate priority can be cleared from the multifunction display using the reset button (▷ page 126) or button ◁, ▷, ⌂, or ⌘ on the steering wheel. They are then stored in the vehicle status message memory (▷ page 138). Remember that clearing a message will only make the message disappear. Clearing a message will not correct the condition that caused the message to appear.

Warning!

All categories of messages contain important information which should be taken note of and, where a malfunction is indicated, addressed as soon as possible at an authorized Mercedes-Benz Center.

Failure to repair condition noted may cause damage not covered by the Mercedes-Benz Limited Warranty, or result in property damage or personal injury.

Warning!

No messages will be displayed if either the instrument cluster or the multifunction display is inoperative.

Contact your nearest authorized Mercedes-Benz Center.

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Switching on the ignition causes all instrument cluster lamps (except low beam headlamp indicator lamp, high beam headlamp indicator lamp, and turn signal indicator lamps unless activated) as well as the multifunction display to come on. Make sure the lamps and multifunction display are in working order before starting your journey.

On the pages that follow, you will find a compilation of the most important warning and malfunction messages that may appear in the multifunction display.

For your convenience the messages are divided into two sections:

  • Text messages (▷ page 354)
  • Symbol messages (▷ page 362)

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Text messages

Display message Possible cause Possible solution
Front-pass.airbag activatedSee Operator’s Manual Air bag is activated while driving even though a child, small individual, or object below the system’s weight threshold is on the front passenger seat, or the front passenger seat is empty. Objects on the seat or forces acting on the seat may make the system sense supplemental weight. Stop the vehicle in a safe location as soon as possible and check the following:▶ Make sure that there is nothing between seat cushion and child seat and check installation of the child seat.▶ Make sure that no objects applying supplemental weight onto the seat are present. The system may recognize such supplemental weight and sense that an occupant on the front passenger seat is of a heavier weight than actually present.(Continued on next page)

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Display message Possible cause Possible solution
Front-pass. airbag activated See Operator’s Manual If performing any of the above corrective steps is successful, the message Front-pass. airbag deactivated See Operator’s Manual will appear in the multifunction display, confirming the situation has been remedied. Note that after performing the corrective steps, it may take up to 60 seconds for the message Front-pass. airbag deactivated See Operator’s Manual to appear.If the message Front-pass. airbag activated See Operator’s Manual remains on in the multifunction display and/or the indicator lamp remains out even after performing the above corrective steps, have the system checked as soon as possible by an authorized Mercedes-Benz Center.

Warning!

If the message Front-pass. airbag activated See Operator’s Manual remains on in the multifunction display and/or the indicator lamp remains out even after performing the above corrective steps, do not have any children 12 years old and under and other small individuals use the front passenger seat until the system has been repaired.

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Display message Possible cause Possible solution
Front-pass.airbag deactivatedSee Operator’s Manual Air bag is deactivated while driving even though an adult or someone larger than a small individual is occupying the front passenger seat. Forces acting on the seat may make the system sense a decrease in weight. Stop the vehicle in a safe location as soon as possible and check the following:▶ Do not lean on armrests or lift yourself up using handle over the door. This may make the system sense that an occupant of a lesser weight than actually present is on the front passenger seat.▶ Re-position yourself.▶ Sit properly belted in a nearly upright position with your back against the seat backrest.If performing any of the above corrective steps is successful, the message Front-pass. airbag activated See Operator’s Manual will appear in the multifunction display, confirming the situation has been remedied.(Continued on next page)

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Display message Possible cause Possible solution
Front-pass.airbag deactivatedSee Operator’s Manual Note that after performing the corrective steps, it may take up to 60 seconds for the message Front-pass. airbag activated See Operator’s Manual to appear.If the message Front-pass. airbag deactivated See Operator’s Manual remains on in the multifunction display and/or the indicator lamp remains on even after performing the above corrective steps, have the system checked as soon as possible by an authorized Mercedes-Benz Center.Do not have any passenger use the front passenger seat until the system has been repaired.

Warning!
If the message Front-pass. airbag deactivated See Operator’s Manual remains on in the multifunction display and/or the indicator lamp remains illuminated even after performing the above corrective steps, do not have any passenger use the front passenger seat until the system has been repaired.

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Display message Possible cause Possible solution
ABS malfunction. Visit workshop. The ABS has detected a malfunction and has switched off. The ESP and the BAS are also deactivated. The brake system is still functioning normally but without the ABS available. ► Continue driving with added caution. Wheels may lock during hard braking, reducing steering capability.► Have the system checked at an authorized Mercedes-Benz Center as soon as possible.Failure to follow these instructions increases the risk of an accident.
Display malfunction. Visit workshop. The ABS or the ABS display is malfunctioning. ► Continue driving with added caution. Wheels may lock during hard braking, reducing steering capability.► Have 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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Display message Possible cause Possible solution
BAS unavailableSee Operator’s Manual The charging voltage has fallen below ten volts. The BAS has switched off.The battery might not be charged sufficiently.The brake system is still functioning normally but without the BAS available. ► Continue driving with added caution.► If necessary, have the generator and battery checked.When the voltage is above this value again, the BAS is operational again.
malfunction.Visit workshop. The BAS has detected a malfunction and switched off. ► Continue driving with added caution.► Have the system checked at an authorized Mercedes-Benz Center as soon as possible.Failure to follow these instructions increases the risk of an accident.
Display malfunction.Visit workshop. The BAS or the BAS display is malfunctioning. ► Continue driving with added caution.► Have 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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Display message Possible cause Possible solution
ESP unavailableSee Operator’s Manual The ESP was deactivated because of a malfunction or interrupted power supply.The ABS might not be operational.The brake system is still functioning normally but without the ESP available. ► Continue driving with added caution.► Visit an authorized Mercedes-Benz Center as soon as possible.Failure to follow these instructions increases the risk of an accident.
If the yellow ESP warning lamp ⚠ flashes while driving and this message appears, the electronic traction system has switched off to prevent overheating of the drive wheel brakes. As soon as the brakes have cooled off, the electronic traction system switches on again.
The self-diagnosis has not been completed yet.The brake system is still functioning normally but without the ESP available. The display will clear after driving a short distance at more than 12 mph (20 km/h).
The charging voltage has fallen below ten volts. The ESP has switched off.The battery might not be charged sufficiently. ► Continue driving with added caution.► If necessary, have the generator and battery checked.When the voltage is above this value again, the ESP is operational again.

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Warning!

In the event a malfunction of the SRS is indicated as outlined above, the SRS may not be operational.

For your safety, we strongly recommend that you visit an authorized Mercedes-Benz Center immediately to have the system checked; otherwise the SRS may not be deployed when needed in an accident, which could result in serious or fatal injury, or it might deploy unexpectedly and unnecessarily which could also result in injury.

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Symbol messages

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Display symbol Display message Possible cause Possible solution
BRAKE (USA only)(P) (Canada only) Parking brakeRelease brake. You are driving with the parking brake set. ► Release the parking brake (▷ page 48).
**** Brake wearVisit workshop. The brake pads have reached their wear limit. ► Have the brake pads replaced as soon as possible.
BRAKE (USA only)(!) (Canada only) Brake fluidVisit workshop. There is insufficient brake fluid in the reservoir. ► Risk of accident! Stop the vehicle and notify an authorized Mercedes-Benz Center. Do not add brake fluid! This will not solve the problem.

Warning!
Driving with this message displayed can result in an accident. Have your brake system checked immediately. 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.


!
Brake pad thickness must be visually checked by a qualified technician at the intervals specified in the Maintenance booklet.


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Display symbol Display message Possible cause Possible solution
CoolantCheck level The coolant level is too low. ► Add coolant (▷ page 301).► If you have to add coolant frequently, have the cooling system checked by an authorized Mercedes-Benz Center.

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 can be seriously burned.

Do not ignore the low engine coolant level warning. Extended driving with the message and symbol displayed may cause serious engine damage not covered by the Mercedes-Benz Limited Warranty.

Do not drive without sufficient amount of coolant in the cooling system. The engine will overheat causing major engine damage.

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Display symbol Display message Possible cause Possible solution
CoolantStop, engine off! The coolant is too hot. ► Stop the vehicle and turn off the engine.► Only start the engine again after the message disappears. You could otherwise damage the engine.

Warning!

Driving when your engine is badly 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 and can occur just by opening the hood. Stay away from the engine if you see or hear steam coming from it.

Turn off the engine, get out of the vehicle and do not stand near the vehicle until the engine has cooled down.


During severe operating conditions and stop-and-go city traffic, the coolant temperature may rise close to 248°F (120°C).


!

The engine should not be operated with the coolant temperature above 248°F (120°C). Doing so may cause serious engine damage which is not covered by the Mercedes-Benz Limited Warranty.


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Display symbol Display message Possible cause Possible solution
CoolantStop, engine off! The poly-V-belt could be broken. ► Stop immediately and check the poly-V-belt.If it is broken:► Do not continue to drive. Otherwise the engine will overheat due to an inoperative water pump which may result in damage to the engine. Notify an authorized Mercedes-Benz Center.If it is intact:► Do not continue to drive the vehicle with this message displayed. Doing so could result in serious engine damage that is not covered by the Mercedes-Benz Limited Warranty.► Observe the coolant temperature gauge in the instrument cluster (▷ page 24).► Drive immediately to the nearest authorized Mercedes-Benz Center.
CoolantVisit workshop. The cooling fan for the coolant is malfunctioning. ► Observe the coolant temperature gauge in the instrument cluster (▷ page 24).► Have the fan replaced as soon as possible.

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Display symbol Display message Possible cause Possible solution
Cruise contr.Drive to workshop Cruise control is malfunctioning. ▶ Visit an authorized Mercedes-Benz Center.
Display malfunction.Visit workshop. The instrument cluster display is malfunctioning. ▶ Continue driving with added caution.▶ Visit an authorized Mercedes-Benz Center as soon as possible.
The displays for several systems have malfunctioned. Some systems themselves may also have malfunctioned. ▶ Have the electronic systems checked by an authorized Mercedes-Benz Center.
Display malfunction.Visit workshop. Certain electronic systems are unable to relay information to the control system. The following systems may have failed:• Coolant temperature display• Tachometer• Cruise control display ▶ Have the electronic systems checked by an authorized Mercedes-Benz Center.
Doors open You are attempting to drive with one or more doors open. ▶ Close the doors.

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Display symbol Display message Possible cause Suggested solution
USA only:At next gas stationadd 1.0 qt engine oilCanada only:At next gas stationadd 1.0 l engine oil The engine oil level is too low. ► Add engine oil (▷ page 299) and check the engine oil level (▷ page 298).
Engine oil levelStop, engine off! There is no oil in the engine. There is a danger of engine damage. ► Carefully bring the vehicle to a halt as soon as possible.► Turn off the engine.► Add engine oil (▷ page 299) and check the engine oil level (▷ page 298).
Engine oil levelReduce oil level You have added too much engine oil. There is a risk of damaging the engine or the catalytic converter. ► Have oil siphoned or drained off. Observe all legal requirements with respect to its disposal.
Change engine oilVisit workshop. It may be that there is water in the engine oil. ► Have the engine oil checked.

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Display symbol Display message Possible cause Suggested solution
Engine oil levelVisit workshop. The engine oil has dropped to a critical level. ► Check the engine oil level (▷ page 298) and add oil as required (▷ page 299).► If you must add engine oil frequently, have the engine checked for possible leaks.
Oil sensor malfunctionVisit workshop. The measuring system is malfunctioning. ► Have the measuring system checked by an authorized Mercedes-Benz Center.

When the message At next gas station add 1.0 qt engine oil (Canada: 1.0 l) appears while the engine is running and at operating temperature, the engine oil level has dropped to approximately the minimum level.

When this occurs, the warning will first come on intermittently and then stay on if the oil level drops further.

Visually check for oil leaks. If no obvious oil leaks are noted, drive to the nearest service station where the engine oil should be topped to the required level with an approved oil specified in the Factory Approved Service Products pamphlet.

! The engine oil level warnings should not be ignored. Extended driving with the symbol displayed could result in serious engine damage that is not covered by the Mercedes-Benz Limited Warranty.

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Display symbol Display message Possible cause Possible solution
Check gas cap. See Operator's Manual A loss of pressure has been detected in the fuel system. The fuel cap may not be closed properly or the fuel system may be leaky. ► Check the fuel cap (▷ page 293).If it is not closed properly:► Close the fuel cap.If it is closed properly:► Have the fuel system checked by an authorized Mercedes-Benz Center.
Hood open You are driving with the hood open. ► Close the hood (▷ page 296).
Remove key. You have forgotten to remove the SmartKey. ► Remove the SmartKey from the starter switch.
Replace key Drive to workshop No additional code available for SmartKey. ► Change the SmartKey.

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Display symbol Display message Possible cause Possible solution
3rd brake lamp The high mounted brake lamp is malfunctioning. This message will only appear if all light emitting diodes have stopped working. ► Visit an authorized Mercedes-Benz Center as soon as as possible.
Backup lamp, left The left backup lamp is malfunctioning. ► Replace the bulb as soon as as possible.
Backup lamp, right The right backup lamp is malfunctioning. ► Replace the bulb as soon as as possible.
Brake lampDrive to workshop Brake lamp illumination is delayed or lamp is permanently on. ► Visit an authorized Mercedes-Benz Center as soon as as possible.
Brake lamp left The left brake lamp is malfunctioning. ► Replace the bulb as soon as as possible.
Brake lamp right The right brake lamp is malfunctioning. ► Replace the bulb as soon as as possible.
Display malfunction.Visit workshop. The display for the lamps or the system is malfunctioning. ► Visit an authorized Mercedes-Benz Center as soon as as possible.
Front foglamp left The left front fog lamp is malfunctioning. ► Visit an authorized Mercedes-Benz Center as soon as as possible.
Front foglamp right The right front fog lamp is malfunctioning. ► Visit an authorized Mercedes-Benz Center as soon as as possible.
Front leftside marker lamp The left front side marker lamp is malfunctioning. ► Replace the bulb as soon as as possible.
Front rightsider marker lamp The right front side marker lamp is malfunctioning. ► Replace the bulb as soon as as possible.

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Display symbol Display message Possible cause Possible solution
Low beam right The right low beam lamp is malfunctioning. Halogen headlamp:▶ Replace the bulb as soon as as possible.Bi-Xenon* headlamp:▶ Visit an authorized Mercedes-Benz Center as soon as as possible.
Parking lamp left front The left front parking lamp is malfunctioning. ▶ Replace the bulb as soon as as possible.
Parking lamp right front The right front parking lamp is malfunctioning. ▶ Replace the bulb as soon as as possible.
Rear fog lampSubstitute bulb on The rear fog lamp is malfunctioning.A substitute bulb is being used. ▶ Replace the bulb as soon as as possible.
Switch off lights. Headlamps have been turned on with the driver’s door opened and the SmartKey removed from the starter switch. ▶ Switch off the headlamps.
Taillamp leftSubstitute bulb on The left tail lamp is malfunctioning.A substitute bulb is being used. ▶ Replace the bulb as soon as as possible.
Taillamp rightSubstitute bulb on The right tail lamp is malfunctioning.A substitute bulb is being used. ▶ Replace the bulb as soon as as possible.

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Display symbol Display message Possible cause Possible solution
Turn signal left front The left front turn signal lamp is malfunctioning. ► Replace the bulb as soon as possible.
Turn signal right front The right front turn signal lamp is malfunctioning. ► Replace the bulb as soon as possible.
Turn signal left mirror The left turn signal in the side mirror is malfunctioning. This message will only appear if all light emitting diodes have stopped working. ► Visit an authorized Mercedes-Benz Center as soon as possible.
Turn signal right mirror The right turn signal in the side mirror is malfunctioning. This message will only appear if all light emitting diodes have stopped working. ► Visit an authorized Mercedes-Benz Center as soon as possible.
Turn signal left rear Substitute bulb on The left rear turn signal lamp is malfunctioning. A substitute bulb is being used. ► Replace the bulb as soon as possible.
Turn signal right rear Substitute bulb on The right rear turn signal lamp is malfunctioning. A substitute bulb is being used. ► Replace the bulb as soon as possible.

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Warning!

If the level of steering gear oil in reservoir is too low, the steering power assistance could fail. Much greater effort will then be needed to turn the steering wheel.

Do not add steering oil without checking the steering system.

Do not drive the vehicle. Have the system checked at an authorized Mercedes-Benz Center as soon as possible.

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Text converted from the manufacturer's document. A □ marks a character that could not be read in the original. Back to the Mercedes C240 discussions