12 Dashboard Symbols You Should Never Ignore

By Peter Mytko • Cars. News. Reviews. Car Guru DIY - 20.9.26

You are driving along normally when, suddenly, a small symbol lights up on your dashboard.

At first, you might think, “It’s probably nothing.”

Maybe you have seen the same light before. Perhaps it disappeared after restarting the car. Or maybe you simply do not know what the symbol means and hope it will go away on its own.

That can be a costly mistake.

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Modern cars use dozens of dashboard symbols to communicate with the driver. Some are simply reminders or indicators, while others can warn you about problems involving the engine, brakes, tyres, electrical system or safety equipment.

The colour of the warning light is an important clue. Red warning lights generally indicate a problem that may require immediate attention, while amber lights usually mean the vehicle needs checking as soon as reasonably possible. Green and blue lights are normally informational, showing that a system or feature is operating.

The exact meaning of a symbol can vary between manufacturers, so your owner's handbook should always be treated as the final authority for your particular vehicle. GOV.UK also advises drivers not to ignore warning displays because they could indicate a dangerous fault developing.

Here are 12 dashboard symbols that deserve your attention.

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1. Engine Oil Pressure Warning Light

What it looks like: Usually a red symbol shaped like an oil can, sometimes with a drop of oil underneath.

Picture to add: Oil pressure warning light / oil can dashboard symbol.

The oil pressure warning light is one of the dashboard warnings you should take particularly seriously.

Engine oil does much more than simply keep the engine components slippery. It helps reduce friction, carries heat away from important components and helps protect the engine from excessive wear.

When the oil pressure warning light comes on while the engine is running, it can indicate that the engine is not receiving sufficient oil pressure.

There are several possible causes. The oil level could be too low, there could be an oil leak, the oil pump could have a problem, or another component in the lubrication system could be faulty.

Whatever the cause, continuing to drive with insufficient oil pressure can cause severe engine damage.

If this warning appears while driving, find a safe place to stop as soon as possible and switch the engine off. Check the oil level if it is safe to do so and follow your vehicle manufacturer's instructions.

The AA advises stopping and checking the oil level when this warning appears. If the light remains illuminated despite the oil level being correct, the engine should be switched off and professional assistance sought.

Don't confuse it with: An oil service reminder. A service reminder may simply tell you that routine maintenance is due, whereas the red oil-pressure symbol can indicate a potentially serious lubrication problem.

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2. Brake System Warning Light

What it looks like: Usually a red circle containing an exclamation mark, or a similar brake-related symbol.

Picture to add: Red brake warning light dashboard symbol.

Your brakes are arguably the most important safety system on your car, so a brake warning light should never be casually dismissed.

Depending on the vehicle, the warning light can indicate that the parking brake is applied, the brake fluid level is low, or there is a problem with the braking system.

Sometimes the explanation is simple: you have not fully released the handbrake or electronic parking brake.

But if the light remains on after the parking brake has been released, you should investigate.

A low brake-fluid level can be associated with worn brake components or, more seriously, a leak in the hydraulic braking system. If you notice that the brake pedal feels unusually soft, travels further than normal or braking performance has changed, stop somewhere safe and seek assistance.

The AA notes that a brake warning light can have different causes and that changes in brake-pedal behaviour should be treated seriously.

GOV.UK also advises motorists to check that their brakes work every time they drive and states that a vehicle can be unsafe even if it has a current MOT certificate.

Bottom line: A brake warning light is not something to ignore until your next service.

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3. Battery or Charging System Warning Light

What it looks like: A red battery-shaped symbol with a plus and minus sign.

Picture to add: Car battery warning light on dashboard.

It is easy to assume that the battery warning light simply means your battery is getting old.

That is not necessarily the case.

When this light appears while the engine is running, it can indicate a problem with the vehicle's charging system. Possible causes include an alternator fault, wiring problem, drive-belt issue or a failing battery.

The important point is that the car may continue running for a while even though the charging system has stopped working properly.

Eventually, however, the electrical system can run out of available power. You could lose electrical functions, and depending on the vehicle and fault, the engine may eventually stop.

The UK Highway Code advises that a charge warning light appearing while driving may mean the battery is not charging and should be checked promptly to avoid losing power to the lights and other electrical systems.

If the light comes on, reduce unnecessary electrical loads where appropriate and arrange assistance rather than assuming the problem will disappear.

Remember: The symbol is generally telling you about the charging system, not simply the age of the battery.

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4. Engine Coolant Temperature Warning Light

What it looks like: A thermometer sitting above wavy lines, usually red when the engine is overheating.

Picture to add: Red engine temperature / coolant warning light.

Your engine generates an enormous amount of heat, and its cooling system is responsible for keeping temperatures within a safe operating range.

If the temperature warning light appears, particularly if it is red, the engine may be overheating.

Possible causes include low coolant, a coolant leak, a failed thermostat, a cooling fan problem, a damaged water pump or another cooling-system fault.

Continuing to drive an overheating vehicle can turn a relatively manageable problem into an extremely expensive engine repair.

If the temperature warning appears, find a safe place to stop and follow the instructions in your owner's manual. Never remove a coolant-system cap while the engine is extremely hot unless the manufacturer specifically instructs you to do so safely. Pressurised hot coolant can cause serious burns.

The AA identifies low coolant as a common reason for a coolant-related warning but also points out that more serious cooling-system problems are possible.

Watch for other clues: Steam, an unusual smell, loss of engine power or a temperature gauge moving into the red zone should make you take the warning especially seriously.

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5. Check Engine / Engine Management Light

What it looks like: An amber or yellow outline of an engine.

Picture to add: Amber check engine warning light.

Few dashboard symbols cause more anxiety than the check engine light.

The good news is that it does not automatically mean your engine is about to fail.

The engine management or malfunction indicator light can illuminate because the vehicle's computer has detected a problem involving the engine, emissions system or related components.

Possible causes range from relatively minor issues to faults requiring immediate attention.

For example, the warning may be associated with an emissions-related component, sensor, ignition problem, fuel system fault or another issue detected by the vehicle's onboard diagnostics.

If the light is steady amber, the vehicle may still be driveable depending on the circumstances, but it should be investigated rather than ignored.

If the light is flashing, the situation can be more serious. A flashing engine warning can be associated with conditions that could damage the engine or emissions-control system.

Avoid assuming that because the car still feels normal, nothing is wrong.

A diagnostic scan can identify the fault code stored by the vehicle, but the code itself is not always the complete diagnosis. A technician may need to carry out further testing.

GOV.UK's MOT guidance recognises malfunction indicator lamps as part of vehicle inspection requirements, including systems associated with engine and emissions faults.

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6. ABS Warning Light

What it looks like: Usually the letters “ABS” inside a circle.

Picture to add: ABS dashboard warning light.

ABS stands for Anti-lock Braking System.

The system is designed to help prevent the wheels from locking during hard braking, helping the driver maintain steering control.

If the ABS warning light stays illuminated, there may be a fault with the system.

This does not necessarily mean that your ordinary brakes have completely stopped working. However, the anti-lock function may not be available, depending on the nature of the fault.

That can become particularly important during emergency braking or on slippery surfaces.

Potential causes include wheel-speed sensor faults, wiring problems or other ABS components.

The UK MOT inspection system specifically checks ABS warning lamps, and GOV.UK lists ABS among the safety systems that must be monitored during vehicle inspections.

If the ABS light appears together with a red brake warning light, take the situation particularly seriously and seek professional advice before continuing your journey.

Do not assume: “The brakes still work, so the light doesn't matter.” The whole purpose of ABS is to provide additional braking control when you need it most.

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7. Tyre Pressure Monitoring Warning Light

What it looks like: A horseshoe-shaped symbol with an exclamation mark in the middle.

Picture to add: TPMS low tyre pressure warning light.

This symbol is often called the TPMS light, referring to the Tyre Pressure Monitoring System.

When it illuminates, one or more tyres may have insufficient air pressure.

Sometimes the cause is simple: normal pressure loss over time.

However, it can also indicate a puncture or slow leak.

Driving on an underinflated tyre can affect steering, handling, braking and fuel economy. In severe circumstances, continued driving on a damaged or significantly underinflated tyre can contribute to tyre failure.

The AA advises checking the affected tyre and notes that the warning can indicate a puncture or gradual loss of pressure.

Check your tyre pressures according to the vehicle manufacturer's recommended figures. Do not automatically use the maximum pressure printed on the tyre sidewall as your normal operating pressure.

If the warning returns after you inflate the tyre, investigate the possibility of a slow puncture.

GOV.UK also advises drivers to check tyres for correct pressure, tread and defects and notes that the vehicle handbook provides information on routine vehicle checks.

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8. Airbag or SRS Warning Light

What it looks like: A seated person with a circle representing an airbag.

Picture to add: SRS airbag warning light dashboard.

Airbags are designed to work with seat belts to reduce injury during certain collisions.

The SRS warning light indicates the vehicle's supplementary restraint system, which can include airbags, seat-belt pretensioners and related components.

If the warning light remains illuminated after starting the vehicle, the system may have detected a fault.

That does not necessarily mean an airbag will definitely fail to deploy, but it does mean you should not assume the safety system is operating normally.

This is particularly important because an airbag fault may not produce any obvious symptoms during ordinary driving.

GOV.UK's MOT guidance includes inspection of the SRS malfunction indicator lamp and identifies an SRS malfunction indication as a significant defect category within the MOT framework.

If this warning appears, arrange an appropriate inspection rather than waiting for your next routine service.

One more point: Never attempt to repair or modify airbag wiring yourself unless you are properly qualified to work on these systems.

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9. Electronic Stability Control / Traction Control Warning Light

What it looks like: A car with wavy skid marks underneath it.

Picture to add: ESC / ESP / traction control warning light.

This symbol can be confusing because it does not always mean something is wrong.

When the stability-control light flashes while you are driving, it may simply mean the system is actively working to help maintain traction.

For example, the system may intervene when the vehicle detects wheel slip on a wet, icy or loose road surface.

However, if the warning light stays illuminated continuously when you are driving normally, it may indicate that the system has been switched off or has detected a fault.

Electronic stability control can help prevent loss of control in certain situations by applying braking or reducing engine power to individual wheels or the vehicle as a whole.

GOV.UK's MOT inspection guidance notes that electronic stability control may also be known by names including ESC, ESP, VDC and DSC, depending on the manufacturer.

The AA similarly explains that a flashing stability-control light can indicate the system is operating, while a persistent warning in normal conditions should be investigated.

Remember: Flashing can mean “the system is working.” Constant illumination can mean “check the system.”

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10. Power Steering Warning Light

What it looks like: A steering wheel symbol, often accompanied by an exclamation mark.

Picture to add: Electric power steering warning light.

Power steering makes it much easier to turn the steering wheel, particularly at low speeds.

Modern cars commonly use electric power-assisted steering, although some vehicles use hydraulic systems.

If the power-steering warning light appears, assistance may be reduced or unavailable.

You may suddenly notice that the steering wheel feels much heavier than normal, especially when parking or manoeuvring.

That can make the vehicle more difficult to control, particularly in tight spaces or emergency situations.

The cause could involve an electrical fault, steering sensor, control module, motor or another component, depending on the vehicle.

Because steering is a fundamental safety function, a warning accompanied by noticeably heavier steering should not be ignored.

GOV.UK's MOT inspection material specifically includes electronic power steering among the systems checked during an MOT.

If the steering becomes unexpectedly heavy, slow down safely and find an appropriate place to stop.

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11. Diesel Particulate Filter (DPF) Warning Light

What it looks like: A rectangular filter-like symbol, sometimes containing dots or small circles.

Picture to add: DPF warning light on diesel dashboard.

Diesel cars fitted with a Diesel Particulate Filter use the DPF to capture soot from exhaust gases.

Under suitable driving conditions, the vehicle can periodically regenerate the filter by raising exhaust temperatures and burning accumulated soot.

Problems can occur when the vehicle is used mainly for short journeys, where the conditions required for regeneration may not occur frequently enough.

A DPF warning light can therefore be a sign that the filter needs attention or that regeneration has not completed successfully.

The correct response varies considerably between vehicles. Some manufacturers specify a particular driving procedure that may allow regeneration to take place. Others may require the vehicle to be inspected.

Do not blindly follow generic internet advice about driving at a particular speed or engine RPM. Always consult your vehicle handbook first.

Ignoring a DPF warning for too long can potentially lead to further problems and more expensive repairs.

Important: Never remove, modify or deliberately disable an emissions-control system.

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12. Transmission or Gearbox Warning Light

What it looks like: Depending on the vehicle, it may look like a gear, cog, transmission symbol or a warning message on the digital display.

Picture to add: Automatic transmission / gearbox warning light.

Modern automatic and semi-automatic transmissions are complex mechanical and electronic systems.

A transmission warning can indicate anything from an overheating condition to a sensor, hydraulic, electronic or mechanical problem.

Symptoms can include harsh gear changes, delayed engagement, slipping, unusual noises, inability to select certain gears or the vehicle remaining stuck in one gear.

Some cars will enter a “limp-home” mode when a serious transmission fault is detected. The vehicle may deliberately restrict performance to allow you to reach a safe location or workshop.

Do not treat that reduced performance as a normal driving mode.

If a transmission warning appears, pay attention to how the vehicle behaves. If there is severe slipping, grinding, overheating, loss of drive or another major change, stop somewhere safe and seek assistance.

Because transmission warning symbols vary significantly between manufacturers, your vehicle handbook is especially important here.

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What Do Dashboard Light Colours Mean?

Understanding colours can help you decide how urgently you need to respond.

Red: Stop and investigate

Red warning lights generally indicate a potentially serious problem.

Examples include:

Oil pressure
Brake system
Engine overheating
Charging system

If a red warning light appears while driving, do not automatically continue until you reach your destination.

Find a safe place to stop and check the vehicle instructions. If the problem could make the vehicle unsafe, arrange professional assistance.

Amber: Check as soon as possible

Amber or yellow warning lights commonly indicate a fault or condition requiring attention.

Examples include:

Engine management
ABS
Tyre pressure
Airbag/SRS
Stability control
DPF

Amber does not necessarily mean “stop immediately,” but it certainly does not mean “ignore it.”

Green and blue: Usually information

Green and blue symbols generally tell you that a particular feature is operating.

Examples include headlights, indicators, cruise-control functions and other vehicle features.

They are normally not warnings of a fault.

However, every vehicle is different, so check the handbook if you are unsure.

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Why You Shouldn't Ignore a Dashboard Warning

One of the biggest mistakes drivers make is waiting for a warning light to disappear.

Sometimes it does disappear.

But that does not necessarily mean the underlying problem has been fixed.

Modern vehicles continuously monitor hundreds of components and systems. A warning light may appear because a sensor detected a problem that is intermittent, temperature-dependent or only occurring under particular driving conditions.

Switching the ignition off and restarting the vehicle may temporarily clear the warning, but it does not necessarily repair the fault.

The UK's Highway Code specifically advises drivers to understand their dashboard warning displays and says that if warning lights do not go out after the engine starts, or appear while driving, the driver should stop and investigate because there could be a serious fault.

That is particularly important with red warnings.

What Should You Do When a Warning Light Appears?

Don't panic.

Instead, follow a simple process.

1. Identify the symbol.

Look at the dashboard and compare the symbol with your owner's handbook.

2. Check the colour.

Red generally demands more urgent attention than amber.

3. Pay attention to the vehicle's behaviour.

Has the steering become heavy? Is the engine overheating? Are the brakes different? Has the car lost power?

These symptoms can help indicate how serious the situation may be.

4. Find somewhere safe to stop if necessary.

Do not stop in a dangerous location simply because a warning light appeared. Your first priority should be reaching a safe position.

5. Do not carry out unsafe checks.

For example, do not open a hot cooling system simply because the temperature warning appeared.

6. Consult the owner's handbook.

Different manufacturers use different symbols and procedures.

7. Get professional help when required.

If a warning concerns brakes, oil pressure, overheating, steering or another critical system, professional assistance may be necessary.

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Don't Confuse Dashboard Warnings With Routine Reminders

Not every symbol means that something has failed.

Some dashboard messages are simply reminders.

Your car might tell you that:

A service is due
Screenwash is low
A door or boot is open
The parking brake is applied
A driver-assistance system is switched off
A light is active
A key fob battery is low

These messages can still be useful, but they are different from warnings indicating a potentially dangerous mechanical or electrical fault.

The key is to understand what your particular vehicle is telling you.

Your Dashboard Is Your Car's Early Warning System

Think of the dashboard as a communication system between your vehicle and you.

The car cannot speak, but it can tell you when something needs attention.

Ignoring a warning light because the vehicle “still drives fine” can sometimes turn a small problem into a major repair. A low tyre pressure warning could lead to a damaged tyre. An overheating warning could precede engine damage. An oil-pressure warning could indicate a lubrication problem capable of causing severe engine damage.

On the other hand, understanding the warnings can help you respond calmly and appropriately.

The UK government recommends that drivers regularly check that their vehicle is safe and roadworthy and specifically reminds motorists that a vehicle can be unsafe even when it has a current MOT certificate.

An MOT is not a guarantee that nothing can go wrong between inspections.

Your dashboard can warn you about problems that develop after the test.

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Final Thoughts

Dashboard warning lights are there for a reason.

Some are simple reminders. Others are early warnings that allow you to deal with a problem before it becomes more serious. And some, particularly red warnings involving oil pressure, brakes, overheating or charging, can indicate a problem that should be dealt with immediately.

The most important rule is simple:

Never ignore a warning light just because the car still seems to be driving normally.

If you don't recognise a symbol, check the owner's handbook. If the warning indicates a potentially serious fault, stop somewhere safe and seek professional advice.

It takes only a few seconds to look up a dashboard symbol.

It can take considerably more time and potentially much more money to repair a problem that was ignored.

The next time a strange symbol appears on your dashboard, don't just hope it disappears.

Find out what your car is trying to tell you.