Mercedes-Benz S-CLASS SEDAN 2023 Engine User Manual
Engine
Warning/indicator lamp
Possible causes/consequences and Solutions
The red coolant warning lamp is lit while the engine is running.
Possible causes are:
- The temperature sensor is malfunctioning
- The coolant level is too low
- The air supply to the radiator is obstructed
- The radiator fan is faulty
- The engine coolant pump is faulty
- If there is an additional warning tone, the coolant temperature has exceeded the maximum permissible temperature.
| Warning/indicator lamp | Possible causes/consequences and M Solutions | ||
| WARNING Risk of burns when opening the hood | |||
| If you open the hood in the event of an overheated engine or fire in the engine compartment, the following situations may occur:
You may come into contact with hot gases. You may come into contact with other escaping hot operating fluids. Before opening the hood, allow the engine to cool down. In the event of a fire in the engine compartment, keep the hood closed and call the fire service. |
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| Stop immediately in accordance with the traffic conditions and switch off the vehicle. Do not continue driving.
Note the messages on the driver’s display. If the coolant temperature display is at the lower end of the temperature scale: Consult a qualified specialist workshop. If the coolant temperature display is at the upper end of the temperature scale: Exit the vehicle and keep a safe distance from it until the engine has cooled down. 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 the red area. |
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| Warning/indicator lamp | Possible causes/consequences and M Solutions |
Coolant warning lamp (yellow) |
The yellow coolant warning lamp is lit while the engine is running. Possible causes are:
The temperature sensor is malfunctioning The charge air, transmission oil or battery cooling is faulty The radiator shutters are blocked or defective Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. |
Check Engine warning lamp |
The yellow Check Engine 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. In some states, legal requirements stipulate that you must immediately consult a qualified specialist workshop as soon as the yellow Check Engine warning lamp lights up. Have the vehicle checked as soon as possible at a qualified specialist workshop. |
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warning lamp |
The red electrical malfunction warning lamp is lit. There is a malfunction in the electrics.
Note the messages on the driver’s display. |
Electrical malfunction| Warning/indicator lamp | Possible causes/consequences and M Solutions |
Fuel reserve warning lamp flashes |
The yellow fuel reserve warning lamp lights up while you are driving.
There has been pressure loss in the fuel system. The fuel filler cap is not closed correctly or the fuel system is leaking. Close the fuel filler cap. If the fuel filler cap has already been closed correctly: Consult a qualified specialist workshop. |
Fuel reserve warning lamp lights up |
The yellow fuel reserve warning lamp lights up while the engine is running. The fuel supply has dropped into the reserve range.
Refuel. |
Brakes
| Warning/indicator lamp | Possible causes/consequences and M Solutions |
Electric parking brake indicator lamp (red) (USA only)
Electric parking brake indicator lamp (red) (Canada only)
Electric parking brake indicator lamp (yellow) |
The red electric parking brake indicator lamp flashes or is lit.
The yellow electric parking brake indicator lamp is also lit in the event of a malfunction. Note the messages on the driver’s display. |
| Warning/indicator lamp | Possible causes/consequences and M Solutions |
RBS warning lamp (USA only)
Brakes warning lamp (yellow) (Canada only) |
The yellow é warning lamp (USA only) or the yellow J brake warning lamp (Canada only) is lit while the vehicle is running.
WARNING Risk of an accident due to a brake system malfunction If the brake system is malfunctioning, braking characteristics may be impairer Drive on carefully. Have the brake system checked immediately at a qualified specialist workshop. The Hill Start Assist may be malfunctioning. Adjust your speed and drive on carefully, leaving a suitable distance to the vehicle in front. If the driver’s display shows a display message, observe it. Consult a qualified specialist workshop. |
| Warning/indicator lamp | Possible causes/consequences and M Solutions | ||
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The red brake warning lamp is lit while the vehicle is running. Possible causes are:
The brake force boosting is malfunctioning and the braking characteristics may be affected. There is insufficient brake fluid in the brake fluid reservoir. Note the messages on the driver’s 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. |
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| Brakes warning lamp (USA only)
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| Brakes warning lamp
(Canada only) |
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| WARNING Risk of an accident due to low brake fluid level | |||
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If the brake fluid level is too low, the braking effect and the braking characteristics may be impaired.
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. Do not add brake fluid. |
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Driving and driving safety systems
| Warning/indicator lamp | Possible causes/consequences and M Solutions | ||
ABS warning lamp |
The yellow ABS warning lamp is lit while the vehicle is running. ABS is malfunctioning.
If an additional warning tone sounds, EBD is malfunctioning. Other driving systems and driving safety systems may also be malfunctioning. Note the messages on the driver’s display. |
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| 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 addition, other driving safety systems are switched off. Drive on carefully. Have the brake system checked immediately at a qualified specialist workshop. |
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The yellow ESP® warning lamp flashes while the vehicle is in motion. One or more wheels have reached their grip limit (/ page 255).
Adapt your driving style to suit the road and weather conditions. |
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| Warning/indicator lamp | Possible causes/consequences and M Solutions | |
ESP® warning lamp lights up |
The yellow ESP® warning lamp is lit while the vehicle is running. ESP® is malfunctioning.
Other driving systems and driving safety systems (e.g. BAS) may also be malfunctioning. Note the messages on the driver’s display. |
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| & WARNING Risk of skidding if ESP® is malfunctioning | ||
| If ESP® is malfunctioning, ESP® cannot carry out vehicle stabilization. In addition, other driving safety systems are switched off. Drive on carefully.
Have ESP® checked at a qualified specialist workshop. |
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ESP® OFF warning lamp |
The yellow ESP® OFF warning lamp is lit while the vehicle is running. ESP® is deactivated.
Other driving systems and driving safety systems may also be inoperative.
WARNING Risk of skidding when driving with ESP® deactivated ESP® does not act to stabilize the vehicle. The availability of further driving safety systems is also limited. Drive on carefully. Deactivate ESP® only for as long as the situation requires. |
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| Warning/indicator lamp | Possible causes/consequences and M Solutions |
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If ESP® cannot be activated, ESP® is malfunctioning.
Have ESP® checked immediately at a qualified specialist workshop. Observe the notes on deactivating ESP® (/ page 255). |
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ATTENTION ASSIST warning lamp |
The ATTENTION ASSIST warning lamp is lit. ATTENTION ASSIST is malfunctioning.
Consult a qualified specialist workshop. |
Distance warning lamp |
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. Be prepared to brake immediately. Increase the distance. Function of Active Brake Assist (/ page 274). |
Possible causes/consequences and Solutions
- The Active Brake Assist warning lamp is on.
- Due to dirty sensors or a malfunction, the system is not available or the range of functions is restricted.
- Note the messages on the driver’s display.
- The Active Brake Assist warning lamp is on.
- The system is switched off or the range of functions has been automatically restricted.
- This may be the case if the driver is not wearing a seat belt or another driving system has been activated.
- Observe the notes on Active Brake Assist (/ page 274).
- The Active Brake Assist warning lamp is on.
- After you drive off, the system’s range of functions will be restricted due to the teach-in process. Depending on the ambient conditions, the teach-in process may take a few minutes.
- Observe the notes on Active Brake Assist (/ page 274).
- The yellow AIRMATIC / E-ACTIVE BODY CONTROL warning lamp is lit.
- A malfunction has occurred in AIRMATIC/E-ACTIVE BODY CONTROL.
- Note the messages on the driver’s display.
| Warning/indicator lamp | Possible causes/consequences and M Solutions |
Suspension warning lamp (red) |
The red AIRMATIC/E-ACTIVE BODY CONTROL warning lamp is lit.
A malfunction has occurred in AIRMATIC/E-ACTIVE BODY CONTROL. NOTE The vehicle’s driving characteristics will have changed significantly. Consult a qualified specialist workshop. Note the messages on the driver’s display. Consult a qualified specialist workshop. |
Mercedes-Benz emergency call system |
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| Warning/indicator lamp | Possible causes/consequences and M Solutions |
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Mercedes-Benz emergency call system warning lamp |
The Mercedes-Benz emergency call system is malfunctioning. The Mercedes me connect system is also malfunctioning.
Consult a qualified specialist workshop. |
Tire pressure monitor
| Warning/indicator lamp | Possible causes/consequences and M Solutions | ||
Tire pressure monitoring system warning lamp flashes |
The yellow tire pressure monitor warning lamp (pressure loss/malfunction) flashes for approximately one minute and then remains lit.
The tire pressure monitoring system is malfunctioning. |
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| WARNING There is a risk of an accident if the tire pressure monitoring system is malfunctioning | |||
| The tire pressure monitoring system cannot issue a warning if there is pressure loss in one or more of the tires. Tires with insufficient tire pressure may impair the driving characteristics as well as steering and braking.
Have the tire pressure monitoring system checked at a qualified specialist workshop. |
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Tire pressure monitoring system warning lamp lights up |
The yellow tire pressure monitoring system warning lamp (pressure loss/malfunction) is lit. The tire pressure monitoring system has detected tire pressure loss in at least one of the tires.
WARNING Risk of an accident due to insufficient tire pressure The tires can burst. The tires 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 tire pressures. Adjust the tire pressure if necessary. |
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Warning/indicator lamp
Possible causes/consequences and Solutions
- Stop the vehicle in accordance with the traffic conditions.
- Check the tire pressure and the tires.
Mercedes-Benz 2023 Top Accessories
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Reference Links
View Full User Guide: Mercedes-Benz S-CLASS SEDAN 2023 User Manual
Download Manuals: https://www.mbusa.com/en/owners/manuals
