Blog / Warning lights

Maintenance · 4 min read

Warning Lights Explained: Which Ones Mean Stop Immediately

Dashboard warning lights follow a colour system that tells you roughly how urgent the issue is, even before you know exactly what the specific symbol means. Knowing the colour code alone is enough to make the right call in the moment.

Red: stop as soon as it's safe to do so

A red warning light means a serious problem that risks damage to the car or your safety if you keep driving. Common red warnings include oil pressure, engine temperature, and brake system faults. Continuing to drive on a red warning, even for a short distance, can turn a repairable fault into a much more expensive one, or a genuinely dangerous one. Pull over safely and stop the engine rather than trying to "get home first."

Amber or yellow: get it checked soon, not necessarily right now

Amber warnings indicate something needs attention but usually isn't an immediate safety risk, things like a service reminder, low washer fluid, or a minor system fault. It's generally fine to continue the current journey, but the car should be looked at within the next few days rather than left indefinitely.

Green or blue: informational, not a fault

These simply confirm a system is active, like headlights being on or cruise control engaged. They're not warnings at all.

The most commonly misunderstood ones

• Engine management light (amber, sometimes red): can mean anything from a minor sensor fault to a serious engine problem. If it's flashing rather than solid, that specifically indicates a more urgent issue, often a misfire, and continuing to drive can cause real damage. A solid light is usually safe to drive on briefly to get it checked.
• Oil pressure warning (red): stop immediately. Continuing to drive with genuinely low oil pressure can destroy an engine within minutes.
• Brake system warning (red): stop and check before driving further. This can mean anything from low brake fluid to a more serious fault, and it's not one to gamble on.
• Battery or charging warning: the car is running on battery power alone rather than being charged by the alternator. It'll usually keep running for a while, but can leave you stranded once the battery depletes.

When in doubt

If you're not sure what a light means or how urgent it is, treating it as more serious rather than less is the safer default. Your owner's manual has the definitive list for your specific car, and it's worth knowing where to find it before you need it in a hurry.