It can be easy to overlook the warning lights on your dashboard, but they play a crucial role in keeping your vehicle safe and running smoothly. These lights indicate potential problems that need attention or immediate action. Let’s explore what each warning light means and what steps you should take when they appear.
Mercedes-Benz Warning Light Color System
No matter which model you drive — whether it’s an A-Class, C-Class, or GLE — Mercedes-Benz uses a traffic light color system for dashboard warnings:
- Green: The system is working correctly or is currently in use.
- Yellow: Something needs attention — check it as soon as possible.
- Red: A serious issue that requires you to stop driving immediately when safe.
Common Mercedes-Benz Warning Lights and Actions
1. Parking Brake and Brake Fluid Warning Light
This light indicates that the parking brake is engaged or that brake fluid levels are low. If the ABS warning light is also on, there may be a brake system malfunction.
Action:
Do not drive. Stop safely, keep your speed low, and avoid sudden braking. Contact a service center immediately.
2. Check Engine Warning Light
This light signals potential engine issues, often accompanied by reduced power or stuttering.
Action:
Get the engine checked as soon as possible to prevent further damage.
3. Power Steering Warning Light
This light shows a power steering malfunction.
Action:
Stop safely and restart the car. If the light remains on, drive cautiously to the nearest service center.
4. Exhaust Particulate Filter (DPF) Warning Light
For diesel vehicles, this light indicates a blocked particulate filter.
Action:
Driving with a blocked DPF can cause damage and emit harmful smoke. Seek service immediately.
5. Diesel Exhaust Fluid (AdBlue) Warning Light
This light means the exhaust fluid (AdBlue) level is low.
Action:
Top up the fluid promptly. If the light turns red, the engine may not restart once turned off.
6. Coolant Level Warning Light
Indicates low coolant levels.
Action:
Top up coolant as soon as possible. Wait for the engine to cool before adding coolant.
7. Engine Overheating Warning Light
Signals that the engine is overheating.
Action:
Stop immediately and let the engine cool. Check coolant levels and look for leaks.
8. Low Engine Oil Warning Light
Indicates high oil temperature, low oil level, or low oil pressure.
Action:
Stop safely, check oil levels, and top up if needed. If levels are fine, the oil pump may be faulty.
9. Low Tyre Pressure Warning Light
Indicates low tyre pressure or a puncture.
Action:
Top up air pressure as soon as possible and drive cautiously.
10. Battery Charge Warning Light
Signals an issue with the battery charging system.
Action:
Drive to a service center immediately to avoid a breakdown.
11. Anti-Lock Brake System (ABS) Warning Light
Indicates a fault in the ABS system.
Action:
You can drive cautiously, but if the brake warning light is also on, stop immediately.
12. Brake Pad Wear Warning Light
Indicates worn brake pads.
Action:
Replace brake pads soon to avoid dangerous driving conditions.
13. Electronic Stability Program (ESP) Warning Light
Signals a traction control issue.
Action:
Restart the engine. If the light remains, seek service.
14. Glow Plug Warning Light (Diesel)
Indicates an issue with the glow plugs.
Action:
Get the glow plugs checked and replaced if necessary.
15. Airbag / SRS Warning Light
Indicates a problem with the airbag system.
Action:
Seek immediate service to avoid safety risks.
16. Brake Assist System (BAS) Warning Light
Indicates a temporary issue with BAS.
Action:
Check if sensors are blocked or dirty. If the light persists, seek assistance.
17. Bulb Warning Light
Indicates a failed light bulb.
Action:
Replace the bulb promptly to avoid safety issues and potential fines.
18. Hybrid Fault Warning Light
Indicates a fault in the hybrid system.
Action:
Stop safely and restart the car. If the issue persists, seek service.
19. Attention Assist Warning Light
Indicates drowsiness detection.
Action:
Take a break to avoid fatigue-related incidents.
