What Are Car Dashboard Warning Lights? Symbols, Causes & What to Do

Car dashboard warning lights are small but powerful tools that help you understand your vehicle's condition. When you're driving, these lights appear on the instrument panel to give you quick updates on your car's health. But many drivers get confused or ignore them, which can lead to major car problems or safety risks.

This guide explains the meaning of each warning light and what actions you should take. Understanding these lights can save you money on repairs and keep you safe on the road.

What Are Car Dashboard Warning Lights?

Car dashboard warning lights are symbols that light up on your car's instrument panel to tell you if there's a problem with your vehicle. These lights help you spot issues early - whether it's low oil, a faulty engine, or simply that your headlights are on.

Most modern cars in the UK are equipped with dozens of sensors that monitor the condition of different parts of the vehicle. When something isn�t working as it should, a warning light appears on your dashboard to alert you.

These lights are colour-coded to show how serious the issue is:

• Red Warning Lights - Stop Immediately

A red warning light means there is a serious problem that could affect your safety or damage your vehicle. You should stop the car as soon as it's safe and get help. Driving any further could make things worse.

Example: Engine overheating, low oil pressure, or brake system fault.

• Amber / Yellow / Orange Warning Lights - Check Soon

An amber or yellow light means something needs to be checked soon, but it's not an emergency. You can usually keep driving, but you should get your car inspected by a professional as soon as possible.

Example: Check engine light, low tyre pressure, or service reminder.

• Green / Blue / White Lights - System Active

These lights aren't warnings. They just let you know that a system is working properly or currently in use.

Example: Headlights on, cruise control active, or handbrake engaged.

Car Dashboard Warning Lights: Symbols, And Their Meanings

Understanding these dashboard warning lights is crucial for safe and smooth driving. Each symbol has a specific message about your car's condition. Check out the list below for detailed explanations and what actions to take.

1. Brake Warning Light

The brake warning light is one of the most important dashboard warning lights to pay attention to. It's usually represented by an exclamation mark inside a circle, flanked by two brackets. This symbol typically means that your brake fluid level is low, which can seriously impact your car's ability to stop safely.

This light might come on:

• When you release the parking brake, or
• While you're driving, indicating a more serious issue.

If this warning light appears alongside the ABS warning light, it could mean your braking system has malfunctioned. You might also see the Electronic Brake Force Distribution (EBD) light, which suggests further problems with how your car distributes braking pressure.

Can I drive with the brake warning light on?

No - it's not safe to continue driving.

When the brake warning light is on, you should pull over and stop as soon as it's safe. Driving with potential brake issues can put you and others at serious risk.

Unless you're confident checking brake fluid levels yourself, this is best left to a qualified mechanic. Get your vehicle checked immediately to avoid breakdowns or accidents.

2. Engine Management Light

The engine management light, also known as the check engine light or ECU warning light, signals that there may be a problem with your car's engine or emissions system. It's one of the most common - and often most dreaded - dashboard warning lights.

When this light comes on, you might notice:

• A loss of power
• Stuttering or hesitation when you press the accelerator
• Rough idling or unusual engine noise

This warning light could be triggered by:

• A faulty electrical sensor
• A loose or damaged wire
• More serious issues like a catalytic converter failure or emission control system malfunction

Can I drive with the engine management light on?

You can drive, but you shouldn't delay getting it checked.

If the engine management light is steady, it usually means a less urgent fault - but continuing to drive without diagnosing the issue could lead to expensive repairs later.

If the light is flashing, it indicates a more serious engine issue, and you should stop and seek immediate assistance.

To avoid further damage or breakdowns, have your car inspected by a professional as soon as possible.

3. Airbag Warning Light

The airbag warning light, also known as the SRS (Supplemental Restraint System) warning light, indicates a potential issue with the airbags, sensors, seatbelt pretensioners, or control module. If the light stays on or flashes, it means your airbags may not work properly in the event of an accident.

Airbag warning light is a critical dashboard warning signal that shouldn't be ignored. When this light comes on, it means there's a problem with your car's airbag system, which could prevent it from deploying correctly during a collision - putting your safety at risk.

Common causes of the airbag light:

• Faulty sensors - Airbag sensors can malfunction, triggering the warning even without impact.
• Damaged wiring or connectors - Corroded or loose connections can break communication within the airbag system.
• Clock spring failure - A damaged clock spring in the steering wheel can interrupt signals to the driver airbag.
• Water-damaged or faulty airbag module - If exposed to moisture, the airbag control unit may fail.
• Seatbelt sensor faults - Problems with seatbelt sensors can also activate the warning light.
• Reset system after an accident - The warning light must be manually reset after a crash.

Can I drive with the airbag warning light on?

It's not recommended. While your car may still run normally, a lit airbag light means the safety system is compromised. In a crash, the airbags may fail to deploy or function incorrectly, increasing your risk of injury.

4. Power Steering Warning Light

The power steering warning light signals a problem with your car's steering system, which can affect how easily and safely you control your vehicle. It's one of those dashboard warning lights you should not ignore - especially if you're driving at higher speeds or on winding roads.

This light may appear as a steering wheel icon with an exclamation mark or just a steering wheel symbol.

Common Causes:

Here are some common reasons why this warning light may appear:

• Low Fluid: Most often due to a leak. Check and refill the power steering fluid.
• Electrical Issues: Can occur in electric power steering systems.
• Faulty Pump or Motor: A malfunctioning pump or motor can trigger the light.
• Worn or Loose Steering Belt: : In hydraulic systems, a worn belt can cause the light to appear.

What Should You Do If the Power Steering Warning Light Comes On?

• Pull Over Safely

If the steering feels stiff or unresponsive, it's best to stop the car in a safe location.

• Check Fluid Levels

Open the bonnet and inspect the power steering fluid reservoir. If levels are low, refill using the recommended fluid type from the owner's manual.

• Read the Owner's Manual

The manual provides specific instructions on how to handle the issue and what type of fluid your car requires.

• Consult a Mechanic

If fluid levels are fine or the light stays on after refilling, it's best to visit a qualified mechanic to inspect the system.

• Call Roadside Assistance

If the car is difficult or unsafe to drive, do not take risks. Call for roadside assistance for help.

Can I drive with power steering warning light on?

It's not safe to drive with the power steering warning light on. It could indicate a steering issue that makes the car harder to control. Pull over, check the fluid, and if the light stays on, get the car checked by a mechanic.

5. Diesel Particulate Filter Warning Light

The DPF warning light indicates an issue with the diesel particulate filter, which reduces harmful soot emissions. It's typically caused by soot buildup inside the filter, especially if the vehicle is driven at low speeds or for short trips, preventing the DPF from cleaning itself through a process called regeneration.

Common Causes:

• Soot Build-up: The most frequent cause of the light coming on.
• Failed Regeneration: If the DPF can't clean itself.
• Faulty Sensors: Issues with temperature or pressure sensors.
• Poor Fuel Quality: Low-quality fuel can damage the DPF.
• Driving Style: Frequent short trips or low-speed driving prevent regeneration.

What to Do:

• Drive at Higher Speeds: This can help trigger the regeneration process and burn off soot.
• Consider DPF Cleaning Additives: Some additives can help reduce soot buildup.
• Get the Vehicle Checked: If the light stays on or flashes, consult a mechanic for a diagnosis.

Can I drive with diesel particulate filter warning light on?

It's not recommended to drive with the DPF warning light on. Short trips may be fine, but prolonged driving can damage the engine. If the light is flashing, get it checked immediately.

6. Engine Temperature Warning Light

The engine temperature warning light indicates that your engine is overheating, often due to low coolant levels or cooling system issues. It's a critical warning that requires immediate action to avoid engine damage.

What It Means:

• Overheating engine.
• Low coolant levels.
• Potential issues with the thermostat, water pump, or radiator.

What to Do:

• Pull over and stop the engine.
• Wait at least 30 minutes for the engine to cool.
• Check the coolant levels and top off if needed.
• If the issue persists, have the car inspected by a mechanic.

Driving with the engine overheating can cause considerable damage, so it's best to address the issue immediately.

Can I drive with engine temperature warning light on?

No, it's not safe to drive with the engine temperature warning light on. Stop the vehicle immediately to prevent potential engine damage, such as a blown head gasket or cracked engine block. Allow the engine to cool before checking the coolant levels.

7. Coolant Levels Warning Light

The coolant level warning light indicates that your car's engine coolant is low, which can lead to overheating and potential engine damage. The light typically appears as a radiator symbol or a check engine light, often in amber or red.

What to do when the coolant level warning light comes on:

• Stop in a safe location: If the light is red, it indicates overheating, and you should stop immediately.
• Check the coolant level: Ensure the engine is cool before checking the coolant reservoir.
• Top up if needed: If the level is low, add coolant to the recommended level.
• Check for leaks: Inspect the radiator, hoses, and other coolant system components for leaks.
• If the light persists: If the light remains on after topping up, consult a mechanic to check for a faulty sensor, air in the system, or a leak.

Can I drive with coolant level warning light on?

It's best to avoid long journeys when the coolant level warning light is on. Always top up the coolant fluid promptly to prevent engine damage.

8. Oil Warning Light

The oil warning light indicates a problem with your engine's oil pressure or level, which can lead to serious engine damage if not addressed. The light typically looks like an oil can with a drip or the word "OIL."

Why the Oil Light Might Be On:

• Low Oil Levels: Insufficient oil in the engine can prevent proper lubrication, which is essential to protect engine parts.
• Low Oil Pressure: Caused by a faulty oil pump, clogged oil filter, or leaks.
• Faulty Sensor: A malfunctioning oil pressure sensor can provide inaccurate readings.
• Incorrect Oil Type: Using the wrong oil can trigger the warning light.

What to Do When the Light Comes On:

• Stop Driving: If the light is red, pull over safely and turn off the engine.
• Check Oil Level: Use the dipstick to check the oil level. If low, add the correct type and amount of oil.
• Inspect for Leaks: Look for visible oil leaks around the engine.
• If the Light Remains On: If the light stays on after adding oil, have your car inspected by a mechanic.
• Don't Ignore It: Driving with the oil warning light on can cause severe engine damage.

Can I drive with oil warning light on?

If you see this light while driving, stop immediately and check for leaks. If everything seems fine but the light persists, it's best to consult an expert to avoid costly engine damage.

9. Low Tyre Pressure Warning Light

The low tyre pressure warning light indicates that one or more of your tyres is under-inflated, potentially compromising your safety. This light typically appears as a tyre with an exclamation mark in the middle and is triggered by a drop in pressure, often by about 25% below the manufacturer's recommendation.

What it Means:

• Under-inflation: The light signals insufficient air pressure, which can cause issues like increased wear, poor handling, and even tyre failure.
• Safety Concern: Driving on under-inflated tyres can affect braking, handling, and fuel efficiency.

What to Do When the Light Comes On:

• Check and Adjust Tyre Pressure: Use a pressure gauge to measure tyre pressure and inflate them to the recommended levels, usually found on the doorjamb or in the owner's manual.
• Inspect for Damage: Look for any visible punctures or damage to the tyres.
• Reset TPMS: If applicable, reset the Tyre Pressure Monitoring System after inflating the tyres and driving a short distance.
• Consult a Professional: If the light stays on after adjustments or if you find any damage, seek help from a mechanic or tyre specialist.

Can I Drive with Low Tyre Pressure Warning Light On?

Driving with low tyre pressure is unsafe and should be avoided. If you're able to, inflate the tyre or replace it with a spare. If you cannot do it yourself, contact a breakdown service or professional to fix the issue. Ignoring the light can lead to serious tyre damage or failure.

10. Battery Warning Light

The battery warning light indicates a problem with your car's charging system. This means the alternator is not charging the battery properly, and the car is running solely on the battery's existing charge. If the light stays on, it�s important to address the issue quickly to avoid the risk of the car stalling.

Causes of the Battery Warning Light:

• Alternator or Voltage Regulator Issues: A faulty alternator or voltage regulator can cause the light to illuminate.
• Loose or Corroded Battery Cables: Loose or corroded connections can disrupt the flow of electricity.
• Weak or Old Battery: An old, weak battery may not hold a charge properly, triggering the warning light.
• Faulty Wiring: Issues with the electrical system can also cause the light to come on.

What to Do if the Light Comes on While Driving:

• Stop in a Safe Location: Pull over to a safe spot as soon as possible.
• Turn off Non-Essential Accessories: Reduce the electrical load by turning off lights, air conditioning, and other unnecessary components.
• Inspect the Vehicle: Check the battery connections for corrosion and inspect the alternator belt for wear.
• Get Professional Help: Take the vehicle to a qualified mechanic or repair shop to diagnose and fix the issue.

Can I Drive with the Battery Warning Light On?

You can continue driving until the battery is completely drained, but it's best to fix the problem as soon as possible to avoid further damage or the car stalling.

11. Anti-lock Brake System (ABS) Warning Light

The ABS (Anti-lock Brake System) warning light indicates an issue with your vehicle's braking system, particularly the ABS, which helps prevent wheel lock-up during sudden stops, especially on slippery surfaces. While you may still have braking control, it's crucial to get the system checked.

What it Means:

• The ABS warning light means that the anti-lock braking system is not functioning properly, which can affect your ability to stop quickly or maintain control during emergency braking.

Possible Causes:

• Faulty Wheel Speed Sensors: These sensors detect wheel speed and send data to the ABS module. If damaged or dirty, they can trigger the warning light.
• Low Brake Fluid: The ABS requires sufficient brake fluid pressure to work correctly. Low fluid levels can trigger the light.
• ABS Module Issues: A malfunctioning ABS module due to wiring problems or corrosion can cause the light to stay on.
• Blown Fuse or Wiring Problems: Issues like a blown fuse can cause the ABS to shut down.

What to Do:

• If the ABS warning light stays on, have your vehicle inspected by a mechanic to diagnose and fix the issue.

Can You Still Drive with the ABS Light On?

While you can still drive with the ABS light on, it's not advisable. Without ABS, the risk of wheel lock-up increases, especially during hard braking, making it harder to steer and potentially leading to a skid. If the brake warning light is also on, you should avoid driving and seek immediate repairs.

12. Electronic Stability Problem (ESP) Warning Light

The ESP (Electronic Stability Program) warning light indicates an issue with your vehicle's stability control system. It can either flash or stay illuminated, depending on the situation.

Flashing ESP Light:

• Normal Operation: The light may flash briefly when the system is actively maintaining vehicle stability, especially on slippery or uneven surfaces.
• No Immediate Action Needed: A flashing light is a normal function and doesn't require immediate action.

Constantly Illuminated ESP Light:

• System Malfunction: A steady light indicates a fault with the ESP system, such as faulty sensors, wiring, or other components.
• System Deactivated: The light may also remain on if the ESP system was intentionally turned off using the "ESP off" button.

What to Do:

• Restart Your Vehicle: Turn the engine off and restart it to see if the light goes off.
• Professional Inspection: If the light stays on after restarting, it's best to have the vehicle inspected by a mechanic to diagnose the issue.

Additional Tips:

• Tyre Issues: Low tyre pressure or uneven wear can trigger the ESP light.
• Wheel Alignment: Misaligned wheels can interfere with the system.
• Sensor Problems: Faulty wheel speed or steering angle sensors can also cause the warning light to illuminate.

13. Brake Pad Warning Light

The brake pad warning light indicates that your brake pads are worn and need to be replaced. This light typically appears as a circle inside dotted brackets, signalling that the brake pad material has worn down to a critical level.

Why it's important:

• Reduced Braking Effectiveness: Worn brake pads decrease your car's stopping power, which can affect your ability to control the vehicle, especially in emergency situations.
• Safety Risk: Driving with worn brake pads puts you and others at risk, so it's important to act quickly.

What to Do:

• Immediate Inspection: Have your brake pads checked by a professional as soon as possible. They'll assess if a replacement is needed and ensure your braking system is functioning properly.
• Don't Ignore the Warning: While you may be able to drive for a short distance after the light appears, it's essential to get the issue addressed promptly to avoid further damage to the braking system.

FAQs about Car Dashboard Warning Lights

1. How do you clear a car warning light?

To clear a car warning light, first address the underlying issue. This may involve topping up fluids, inflating tyres, or replacing faulty parts. Once resolved, the light may turn off automatically, or you can reset it using an OBD2 scanner or by disconnecting the car battery for a few minutes. Always consult your vehicle manual or a mechanic for guidance.

2. What is the most urgent warning light in a car?

The most urgent warning light is the red engine oil pressure light. It signals low oil pressure, which can cause severe engine damage if ignored. Stop the car immediately, check oil levels, and seek professional help before continuing to drive.

3. Can I still drive with a warning light?

It depends on the warning light. Red warning lights mean stop immediately-it could be a serious safety or mechanical issue. Amber lights signal caution and usually mean the vehicle can be driven safely for a short period, but the issue should be checked soon. Green and blue lights are typically informational.

4. What is the most common colour of a dashboard warning light?

Amber is the most common dashboard warning light colour. It usually indicates non-critical issues that need attention, such as low tyre pressure or a service reminder.

5. How to reset or turn off car warning lights?

To reset a warning light, fix the root cause of the issue first. Then, use an OBD2 diagnostic tool to clear the error code or perform a battery reset. Some newer cars also allow manual resets via the infotainment system or dashboard settings.

6. Are warning lights the same across all car brands?

While many dashboard warning lights are standardised, there can be slight differences in symbols, colours, or functionality across car brands and models. Always refer to your vehicle's handbook for brand-specific meanings.

7. Can a car warranty help with dashboard warning light issues?

Yes, a car warranty can cover the repairs needed to fix the issue behind a warning light, provided it's part of the covered components like engine, transmission, or electrical systems. Check your warranty terms to confirm what's included.

8. Will my car pass an MOT with a warning light on?

No, your car will fail its MOT if there's a red or amber warning light illuminated on the dashboard, especially if it relates to safety systems like airbags, brakes, or the engine. Make sure all lights are cleared before the test.

Conclusion

Understanding your car's dashboard warning lights isn't just about avoiding breakdowns - it's about staying safe on the road and preventing costly repairs down the line. Whether it's a red alert demanding immediate action or an amber signal urging a check-up, paying attention to these symbols can save you time, stress, and money.

To stay protected, it's wise to invest in a comprehensive car warranty. Warranty Direct offers tailored cover for petrol, hybrid, and electric vehicles, including components commonly linked to dashboard warning lights. Plus, with the added benefit of breakdown cover, you can drive with confidence knowing help is available when you need it most.