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Dashboard warning light colours

Red dashboard warning light
A red dashboard light suggests a potential serious problem to either the vehicle or to your safety. A red warning light may also be used to remind you of an important issue.

Orange or yellow dashboard warning light
A orange or yellow dashboard warning light is intended to provide the driver information that the engine or a component of the vehicle needs repairing or servicing.

Flashing dashboard warning light
A flashing dashboard warning light is used to inform the driver of a state of urgency that the engine or component of the vehicle needs repair or replacing.

Green or blue dashboard lights
Green or blue dashboard lights are for informational purposes to inform the driver that a system or utility is in operation.

Dashboard warning lights and MOT

An MOT needs to be conducted on a every car that is driven on public roads that is 3 years or more in age. The full details of what is covered in an MOT can be found in the what is an MOT section.

Dashboard warning lights if illuminated may affect the outcome of an MOT and result in a failure. A car will fail an MOT test if a dashboard warning light shows a problem such as:

  • Airbags
  • Electric Power Steering
  • Electronic stability control
  • Electronic parking brake
  • Brake fluid level
  • Headlight main beam
  • Tyre pressure monitoring system
  • Additional restraint systems.
 
 

Dashboard warning lights

Most modern cars have on-board computers called engine management systems. The engine management system communicates with sensors in and around the engine to ensure the safe running of car engine components. The engine management system or electronic control unit (ECU) also helps to reduce emissions and increase fuel economy.

A cars ECU is also linked to other components around the car such as airbag sensors and brakes depending on the make and model of the car.

Components can become broken or worn, and when they do dashboard warning lights will illuminate on the dashboard.

Some dashboard warning lights can be specific to a certain make or model of car and others can be universally recognised. Your cars handbook will explain what all the various dashboard warning lights mean and how severe the problem could be.

Dashboard warning light meanings

Below are the most recognised and typical dashboard warning lights on vehicles along with their meanings.

Engine warning light
Engine warning light

Engine warning light
The engine warning light, or malfunction indicator lamp (MIL) on some vehicles may be red in colour and will illuminate when the ignition is turned on and should extinguish once the engine has started. If once the engine has started the engine warning light remains illuminated, it will suggest a problem with the engine. If the engine warning light begins flashing, ease off the accelerator and seek assistance immediately.

Engine oil warning light
Engine oil warning light

Oil pressure dashboard warning light
The oil pressure warning light will illuminate upon switching the cars ignition on and will extinguish once the engine has started. If the light remains on when the engine has started or illuminates whilst driving, stop the car and turn the engine off as soon as possible. Check engine oil levels are sufficient (see Show Me Tell Me for assistance). Driving with insufficient oil in the engine can cause fatal engine damage. If engine oil is correct, do not start engine and seek assistance. See how to check engine oil for a complete in-depth guide on checking your car's engine oil and topping up.

Batter warning light
Battery warning light

Battery charge warning light
The battery charge dashboard warning light will illuminate when the ignition is switched on and will extinguish once the engine has started if working correctly. If light does not illuminate when ignition is switched on, illuminates after engine is started or whilst driving, the battery is not charging. The possible causes could be a dead battery, faulty alternator or lose or corroded connection on the battery terminals.

Brake warning light
Brake warning symbol

Brake system dashboard warning light
The brake system warning light will illuminate when the handbrake / parking brake is applied and should extinguish once the handbrake is released. If the light remains on and the handbrake is released it indicates a problem with the braking system of the car. Check brake fluid levels are at correct levels and if light remains on, mechanical assistance should be sought immediately.

ABS warning light
ABS warning light

ABS warning light
The Anti-Lock Braking System or ABS warning light will illuminate during normal driving if there is a problem with the anti-lock braking system. The ABS warning light will illuminate briefly when the ignition is switched on when the car is started to confirm the ABS system is functional. If light is illuminated, normal braking is maintained although the anti-lock system will be defective.

Parking brake warning light
Parking brake warning symbol
Parking brake warning light
This is the dashboard parking brake warning light or handbrake warning light. These lights can be either red or orange depending on the make of the vehicle. The symbol is illuminated to warn the driver that the parking brake or emergency brake is engaged and must be released before driving off. A parking brake warning light may also have a wrench or spanner illuminated underneath which suggests electronic parking brakes need servicing. If the light is illuminated along with a spanner or wrench, the vehicle can be driven safely but requires maintenance.
Engine overheating light
Engine overheating light

Engine overheating dashboard symbol
The engine overheating symbol will illuminate if your car engine becomes dangerously hot. An overheating engine can seize causing fatal damage. If light illuminates whilst driving, pull over and turn engine off as soon as possible. Wait for the engine to cool down before checking coolant. Possible reasons could be blocked or leaking within the engine coolant system, or simply insufficient coolant. See what is engine coolant for a run-down on how engine coolant works, how it benefits the engine and how to check engine coolant levels.

Airbag warning light
Airbag warning light

Airbag warning light
The airbag warning light or SRS (Supplemental Restraint Systems) light will illuminate if one or all of the cars airbags have been deactivated. Check vehicle manual for any checks that can be performed. Vehicle can still be driven. If light remains on, specialist diagnostic equipment will need to be used to diagnose faults and to extinguish the warning light.

Seat belt dashboard light
Seat belt dashboard light
Seat belt dashboard warning light
Seat belt reminder dashboard warning light will remain active if the vehicle ignition is on and may flash when the vehicle begins to move if the seat belt remains unfastened. An audible alarm may sound if the vehicle is moving and the seat belt is unfastened. Fastening the seat belt will extinguish the light and cease an audible alarm (if applicable).
Catalytic Converter light
Catalytic converter light

Catalytic converter warning symbol
Some vehicles may have a catalytic converter warning symbol on the dashboard. If the light remains illuminated it could suggest a problem with a damaged, overheated or malfunctioning catalytic converter. Some other vehicles may illuminate the engine warning light id there is a problem with the catalytic converter. The engine management system may reduce power to the engine if there is a problem with the catalytic converter.

Tyre pressure warning light
Tyre pressure warning light

Tyre pressure warning light
The tyre pressure warning light will become illuminated when the tyre pressure monitoring system detects a tyres pressure is reduced by 25% or more. This dashboard warning light is more frequently illuminated during cold winter months when outdoor temperatures are reduced and lowering the tyre pressures.

Full beam headlights symbol
Full beam headlights symbol

Full beam dashboard indicator
The full beam symbol lets you know when your cars headlights are turned to full beam.

Fog lights symbol
Fog lights symbol

Fog lights dashboard symbol
The fog lights dashboard symbol illuminate to tell you that your fog lights are on. It is a legal requirement that rear fog lights are illuminated and should be illuminated when visibility is less than around 100 metres. It is an offence to illuminate fog lights when conditions do not call for their use.

Rear window demister / defogger/ defrost dashboard light symbol
Rear window demister

Rear window demister / defogger/ defrost dashboard light
The rear windscreen demister light may illuminate on the dashboard or on the demister button itself. Light symbol only illuminates when button is manually activated. The window demister system can consume a large proportion of the batteries energy if activated for long periods. Turn off once window is clear to save battery energy, which in turn saves fuel.

Power steering warning light
Power steering warning light

Power steering dashboard warning light
The power steering warning light will illuminate if your fluid levels are low or if there is a fault within the system. Check power steering fluid levels and top-up if necessary. If fluid levels continuously fall, there may be a leak in the system. Steering is possible without the aid of power steering although may become difficult at low speeds. If power steering dashboard warning light remains illuminated after replenishing levels, contact your dealer.

Diesel glow plug light symbol
Diesel glow plug light symbol

Diesel glow plus light symbol
Diesel engines require glow plug to heat the engine cylinders before starting. By turning on the ignition, the glow plug symbol will illuminate and extinguish once enough heat has been applied. Trying to start the engine, especially in cold weather will be problematic if either you do not wait for the light to extinguish or there's a fault with the system. If the glow plus light does not come on at all or it flashes, it will indicate there is a fault with the glow plug itself, wiring or fuse.