Dashboard Warning Lights: Which Ones Mean Stop Now?

By Jo Marwick · Published Oct 16, 2026 · 6 min read

In this guide

The colour code
Stop now
Flashing check-engine light
Get checked soon
Do not ignore intermittent lights

Modern cars have dozens of warning lights, and most drivers recognise only a few. Knowing which ones are urgent can prevent serious damage or danger.

Always check your owner’s manual, as symbols vary between manufacturers.

The colour code

Most cars use a traffic-light system. Red lights indicate a serious problem or safety issue — stop as soon as it is safe. Amber or yellow lights mean something needs attention soon. Green and blue lights simply show a system is on.

Stop now

Oil pressure warning: stop and switch off — low oil pressure can destroy an engine within minutes
Engine temperature warning: pull over and let the engine cool; do not open the radiator cap while hot
Brake system warning: may indicate low brake fluid or a brake fault
Charging system (battery) warning: the car may soon lose electrical power

Flashing check-engine light

A steady check-engine light means a fault has been detected and should be diagnosed soon. A flashing check-engine light often indicates a severe misfire that can damage the catalytic converter — reduce speed and get it checked promptly.

Get checked soon

Tyre pressure monitoring, ABS, airbag, and traction control warnings do not usually stop the car from moving, but they mean safety systems may not work as designed.

Do not ignore intermittent lights

A light that comes and goes is still a warning. Many garages and parts shops can read stored fault codes, which help pinpoint the problem.

This is general automotive information, not professional mechanical advice. Always follow your vehicle manufacturer’s specifications and service schedule, and have brakes, steering, tyres, and other safety-critical systems inspected by a qualified mechanic.

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