The Colour Code
- Red — stop as soon as safely possible; continuing risks serious damage or danger
- Amber/Orange — action required; book a repair soon; usually still safe to drive short distances
- Green — system is active and working normally (e.g. indicators, cruise control on)
- Blue — information (e.g. high-beam headlights are on)
Critical Red Warning Lights — Stop Immediately
- Oil pressure (oil can symbol) — critically low oil pressure; engine damage within minutes if ignored. Stop, switch off, check oil level.
- Engine temperature (thermometer in water) — overheating. Pull over, switch off, wait 30 minutes. Never open a hot radiator cap.
- Battery / charging — alternator fault; the battery is not charging. You may have 20–60 minutes before the car stops. Drive to a garage.
- Brake system — could indicate low brake fluid or worn pads. If the pedal feels spongy, stop immediately.
Amber Warning Lights — Service Required
- Engine management (engine outline) — fault detected in engine or emissions system. Book a diagnostic scan; safe to drive short distances.
- Tyre pressure (TPMS) — one or more tyres significantly under-inflated; inflate as soon as possible
- Service due — routine service is overdue; book within the next few weeks
- Fuel low — typically 50–80 km of range remaining; refuel soon
- ABS fault — normal brakes still work but ABS is disabled; drive carefully and book a repair
What to Do When a Red Light Appears
- Signal and move to the side of the road safely
- Switch off the engine
- Consult the owner’s manual
- Call for assistance — do not drive further with a red oil or temperature warning
Key Takeaways
- Red = stop now; amber = fix soon; green/blue = information
- Oil pressure and overheating are the most urgent
- Never ignore a battery warning — you may have very little time
- Symbols vary between manufacturers — keep your owner’s manual accessible