Do you know what the various car dashboard lights mean?

1 September 2026

Car dashboard with illuminated warning lights behind the steering wheel

A warning light on the dashboard rarely explains itself. Some let you finish the trip, others mean the next few kilometres will turn a repair into a replacement. This guide explains what the colours mean, what the most common symbols are telling you, and why a dashboard with no lights at all is not proof that the car is healthy.

TL;DR

Dashboard lights are colour-coded: red means stop as soon as it is safe, amber means book the workshop within days, green and blue are information only. The most expensive mistakes come from ignoring oil pressure, coolant temperature and charging lights, all of which can turn a repair into an engine replacement. Remember that fault memory can be cleared in a minute with a cheap diagnostic tool, so a clean dashboard at a viewing says nothing about the car's past.

Key Information

Colour tells you how urgent it is: red now, amber soon, green and blue never.
Oil pressure, coolant temperature and charging lights are the three that destroy engines when ignored.
An amber check engine light usually means limp mode, not a roadside stop.
Lights that do not come on during the ignition self-test are as suspicious as lights that stay on.
Clearing fault memory takes a minute, so a clean dashboard proves nothing about the car's history.

Every warning light in a car belongs to one of two groups: the ones that let you finish your journey, and the ones that mean the next few kilometres can turn a repair into a replacement. Telling them apart takes about three seconds, as long as you read the colour before you read the symbol.

Colour first, symbol second

Colour	What it means	What to do
Red	Safety risk, or a fault that damages the car while you drive	Stop as soon as it is safe
Amber or yellow	A recorded fault that needs attention, not a roadside stop	Book the workshop within days
Green	A system is switched on and working correctly	Nothing
Blue or white	Information, usually lighting or driver assistance	Nothing

Two habits are worth building. The first is to watch the ignition self-test: when you switch the ignition on, most warning lights come on for a second or two and then go out. That short moment is your only chance to notice a warning that no longer works at all. The second is to trust the colour before the symbol, because symbols differ between manufacturers while the colour code does not.

Red lights: stop as soon as it is safe

Oil pressure — an oil can symbol. This is not the same as a low oil level warning. It means the pump is no longer pushing oil through the engine, and an engine without oil pressure seizes in minutes. Stop, switch off, check the level, and do not restart if the light comes back.

Coolant temperature — a thermometer floating in liquid. The engine is overheating. Stop and let it cool down before opening anything; a hot cooling system is under pressure and will spray scalding coolant at whoever opens the cap.

Charging system — a battery symbol. The alternator has stopped charging. The car will keep running on what is left in the battery, typically for twenty to forty minutes, and then stop wherever it happens to be. Switch off everything you do not need and drive straight to a workshop, or stop and call for help.

Brake system — a circle with an exclamation mark, sometimes the word BRAKE. First check that the handbrake is fully released. If it is, the light means low brake fluid or a fault in the circuit, and the car should not be driven.

Airbag or SRS — the airbags and belt tensioners are disabled. The car drives normally, which is exactly what makes this one easy to ignore, but in a collision the restraints may not fire.

Power steering — a steering wheel, often with an exclamation mark. Steering still works, but with much more force needed, especially at parking speeds.

Amber lights: keep driving, book the workshop

Check engine — an engine outline. The most common and least specific light on any dashboard. It covers everything from a loose fuel cap to a failing ignition coil. A steady amber light means drive on carefully; a flashing one means unburnt fuel is reaching the catalytic converter, so reduce speed and get it looked at immediately.

ABS — normal braking still works, but the anti-lock function does not, so the wheels can lock under hard braking.

Traction or stability control — a car with skid marks behind it. Flashing means the system is working right now, on a wet or icy surface. Permanently lit means it is either switched off or faulty.

Tyre pressure — a horseshoe shape with an exclamation mark. Check all four tyres with a gauge; the system reports a relative drop and can be triggered by a cold morning as easily as by a slow puncture.

Diesel particulate filter — the filter is loading up with soot because the car has been used mostly for short trips. A longer drive at higher revs usually lets it regenerate. Ignore it long enough and the filter has to be cleaned or replaced.

Glow plugs — a coil symbol on diesel engines. Flashing after start-up means a fault in the preheating system, which shows up as hard starting on cold mornings.

Brake pad wear — the pads have reached their minimum thickness. Cheap to fix now, expensive once the discs are scored.

Green and blue lights are not faults

Green means a system is on and doing its job: side lights, cruise control, indicators. Blue is reserved almost everywhere for main beam. White is used for information from driver assistance systems, such as lane keeping or speed limit recognition. None of them require any action, and their absence is not a problem.

What to do when a light comes on

Read the colour. Red is an instruction to stop, amber is an appointment, green and blue are information.
If it is red, pull over somewhere safe and switch the engine off before you investigate anything.
Check the gauges and the simple things first: temperature, fuel level, whether a door or the handbrake is the actual cause.
Look the symbol up in the owner's manual. Manufacturers use their own icons, and the manual is the only source that matches your exact car.
If a red light returns after restarting, do not drive on. Recovery costs less than an engine.

Electric and hybrid cars: the same lights, plus a few of their own

Brakes, airbags, tyre pressure and driver assistance warn in exactly the same way in an electric car. What is added is a ready indicator confirming the car will move when you press the accelerator, a high-voltage system warning that always means a workshop rather than a driveway repair, and a reduced-power symbol, usually a turtle, which appears when the battery is too cold, too hot or nearly flat.

What you will not find in a combustion car is the state-of-charge display with remaining range, which in an electric car takes the place a fuel gauge used to occupy.

A dashboard with no lights is not the same as a car with no faults

Fault memory can be cleared with a diagnostic tool costing less than a tank of fuel, and the warning stays away until the car has completed enough drive cycles to detect the fault again. Disconnecting the battery has a similar effect on some systems. Before a viewing, that is a quick way to make a dashboard look clean.

This is why the dashboard tells you about the last few minutes of the car's life and nothing about the years before. Service records show whether the same fault has been coming back for three years. Mileage history shows whether the odometer reading in front of you fits the rest of the car's story. Neither can be cleared with an OBD tool in a car park.

When you inspect a used car, look at the dashboard during the ignition self-test rather than after the engine is running: a warning that never lights up at all has usually been disabled on purpose, and that is worth more attention than a light that honestly stays on.

Check the car's history before you trust its dashboard

Fault memory can be cleared in a minute. Mileage and service records cannot. Order a vehicle history report by VIN.

Frequently Asked Questions

Treat it as an instruction to stop. Pull over as soon as it is safe, switch the engine off and check the obvious things: oil level, coolant level, whether the handbrake is still on. Red lights for oil pressure or coolant temperature mean that continuing to drive can destroy the engine within minutes, so it is cheaper to call for assistance than to try to reach the workshop.

Usually yes, but not indefinitely. Amber means the car has recorded a fault and often switched to a reduced-power mode to protect itself. You can normally drive home or to a workshop, but you should not put off the visit — many amber faults, such as a clogged particulate filter or a failing sensor, become expensive precisely because they were ignored for weeks.

Some faults are intermittent: a sensor reports a value outside its range once, the light comes on, and the system clears it after a few faultless drive cycles. The fault is still recorded in the control unit's memory even though the light is out. A workshop can read it with a diagnostic tool, which is why a light that disappeared is worth mentioning at the next service.

Mostly the same, plus a few of their own. Everything related to brakes, airbags, tyre pressure and driver assistance works identically. On top of that an electric car has a ready-to-drive indicator, a high-voltage system warning and a reduced-power symbol, usually a turtle, which appears when the battery is too cold, too hot or nearly empty.

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