Modern cars can display over 50 different warning lights. Most drivers only know what a handful of them mean. Here's a guide to the most important ones.
🔴 Red Lights — Stop the Car
Red warning lights mean STOP immediately. Continuing to drive could cause serious, expensive damage.
- Engine Temperature (Thermometer icon) — Engine is overheating. Pull over, turn off the car. Do NOT open the radiator cap. Call for help.
- Oil Pressure (Oil can icon) — Engine has no oil pressure. Stop immediately. Running even 30 seconds without oil pressure can destroy an engine.
- Battery (Battery icon) — The charging system has failed. Your car is running on battery power only — you have 20–30 minutes before it dies completely.
- Brake Warning — Could be handbrake left on, or low brake fluid. If brakes feel soft or different, stop immediately.
🟡 Yellow/Orange Lights — Attention Needed Soon
Yellow lights mean something needs attention, but you can still drive (carefully) to a workshop.
- Check Engine (Engine outline icon) — Many possible causes. If it's solid (not flashing), you can drive to a workshop. If flashing — drive slowly and get it checked today.
- Tyre Pressure (TPMS) — One or more tyres are low. Check tyre pressure at the nearest petrol station.
- Service Due — Maintenance is overdue. Book a service soon.
- ABS — Anti-lock braking system has a fault. Brakes still work, but ABS won't. Safe to drive but get it checked.
🔵 Blue Lights — Information
- High Beam — Your high beams are on. Not a warning, just an indicator.
- Coolant Temperature (Cold) — Engine is still warming up. Normal when starting in the morning.
🟢 Green Lights — Normal Operation
Green lights are usually just status indicators — turn signals, cruise control active, etc. No action needed.
The Battery Warning Light Specifically
If your battery warning light comes on while driving, your alternator may have failed and your car is running entirely on battery reserve. Turn off all non-essential electrics (AC, radio, rear defrost), drive directly to a workshop or home, and don't turn the car off until you're there — it may not restart.