Understanding your Citroën C1’s dashboard warning lights is essential for your safety and for avoiding serious damage or costly repairs. These lights alert you to critical and non-critical issues, so knowing what each means helps you act promptly and appropriately.
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Red Warning Lights (Stop Immediately)
Engine Oil Pressure
Low oil pressure or loss detected. Stop the car, switch off the engine, check oil level, and seek assistance if needed.
Engine Coolant Temperature
The engine is overheating. Stop the vehicle and let the engine cool down before continuing your journey.
Brake System Fault
Indicates brake fluid is low or a system malfunction. Pull over safely, do not continue driving, and get professional help.
Battery Charge Fault
Battery not charging. Electrical systems may fail, stop as soon as it is safe and check the charging system.
Airbag or SRS Fault
A problem is detected in the airbag or seatbelt system. Airbags may not deploy in a crash—stop and consult a specialist.
Seatbelt Reminder
A seatbelt is not fastened while driving. Buckle up immediately for safety.
Power Steering Failure
Indicates steering may become heavy. Stop when safe and seek immediate assistance.
Door Ajar Indicator
A door is not fully closed. Stop and check all doors are shut properly.
Brake Pad Wear
Critical brake pad wear detected. Stop and have pads checked and replaced immediately.
Master Warning (Triangle with Exclamation)
A serious fault requiring urgent attention. Stop safely and check the information display or owner’s manual.
Transmission Temperature
Transmission is overheating. Stop driving, allow system to cool, seek attention if light stays on.
Parking Brake
Parking brake is engaged or fault in the system. Release brake, or if faulty, stop and call a mechanic.
Child Safety Lock/Seat Fault
Warning of an issue with child safety seat or lock. Stop and investigate the cause.
Anti-lock Braking System (ABS) Critical Failure
ABS has failed. Standard braking remains but stability and stopping distance may be affected; drive with extreme caution.
Brake Fluid Level Low
The brake fluid is below safe limits. Do not continue traveling—refill or call for assistance.
Yellow/Amber Warning Lights (Action Required Soon)
Check Engine (Engine Management)
The engine management system has detected an issue. Engine power may be reduced, schedule diagnostics promptly.
Tyre Pressure Monitoring System (TPMS)
One or more tyres underinflated. Check and adjust all tyre pressures as soon as possible.
Traction Control/ESP/ESC
Indicates the traction or stability control is active or has a fault. Reduced stability, drive cautiously and have system checked.
Glow Plug (Diesel Only)
Glows during ignition pre-heat. If it remains after startup, there may be a failure—arrange diagnostics soon.
Fuel Filter Warning (Diesel Only)
Possible water in filter or blockage. Replace or service fuel filter promptly.
Service/Maintenance Reminder
Routine service due or minor fault detected. Book your car in for servicing.
Engine Auto Start-Stop
Stop/start feature is unavailable or malfunctioning—typically not urgent but arrange service if persistent.
DPF Warning (Diesel Particulate Filter)
DPF is clogged and needs regeneration. Drive at a steady speed to clear, or book service if the light stays on.
Fuel Level Low
Fuel is running low. Refuel at the next available station.
Low Washer Fluid
Washer fluid is almost empty—top up when possible.
Key Not Detected/Electronic Key Issue
Key is out of range or has a battery issue. Replace battery or bring the key closer.
Green Warning Lights (Information Only)
Direction Indicators
Shows that left or right turn signal is on.
Lights On Indicator
Signifies side lights, headlights, or daytime running lights are on.
Dipped Beam
Indicates the dipped (low) beam headlights are active.
Main/High Beam
Main (high) beam headlights are active.
Front Fog Lights
Front fog lights switched on for improved visibility.
Rear Fog Lights
Rear fog lights are active; increase rear visibility in foggy conditions.
Cruise Control On
Cruise control system is engaged, allowing speed to be maintained automatically.
ECO Mode/Green Driving Assist
Vehicle is set to eco mode to maximize fuel efficiency.
Parking Sensors Active
Parking sensors are operating to assist with maneuvering.
Lane Departure Alert
Lane departure system monitors to prevent unintended drift.
Auto Hold
The brake auto hold feature is currently maintaining brake force at a standstill.
Adaptive Headlights Active
Indicates adaptive headlight system is adjusting beams automatically.
Automatic Wipers On
Rain sensing wipers are active and adjusting speed automatically.
Heated Rear Window On
Rear window heating is engaged to defog or defrost.
This list covers all major, standard, and information dashboard lights relevant to the Citroën C1 as of 2025. Always check your owner’s manual for exact icons, as some symbols may look slightly different by model year.
