At a glance
Dashboard warning lights alert you to potential problems with your car.
Never ignore a red warning light, it could indicate a dangerous issue that needs immediate attention.
Acting as soon as possible could help you avoid a costly repair bill.
If your car is under warranty, see if it covers any warning light issues that need to be checked.
What do the different car warning light colours mean?
Warning lights on your dashboard follow a traffic light colour scheme based on how severe the potential problem could be.
Why is it important to know your car warning lights?
Dashboard warning lights are there to alert you to the fact that something is wrong with your car or needs attention. If one of these lights comes on, it’s important to understand what your car is trying to tell you, as it may be something serious.
As much as you’d like to, it’s never a good idea to ignore it. By taking action as soon as possible, you might be able to avoid an inconvenient or dangerous breakdown, or expensive repair bill.
Let’s take a closer look at some of the most common red and amber warning lights. We’ll explain the most likely causes, what you should do about the problem and whether you can still drive if they come on.
Brake system warning light
This warning light could be the most worrying – functioning brakes are certainly not optional on a motor vehicle. While it may be something minor like the handbrake not being fully released, it might point to something more serious. It could be that you’re running low on brake fluid or a worn-out brake pad needs replacing.
Is it safe to continue driving with the brake light on?
It’s not worth the risk – faulty brakes can be very dangerous, especially when you need to slow down at motorway speeds or in an emergency.
If you see this warning light, you should take action straight away, especially if the brakes feel spongy or weak when you press down on the pedal. Pull over as soon as it’s safe and call your breakdown service for assistance.
Engine warning light
Another scary one. If this light comes on, it indicates that a sensor has detected a problem with the engine. It’s often accompanied by other clues that your engine isn’t working properly, such as a lack of power or stuttering as you press the accelerator.
It could be down to a small electrical fault or a problem with a sensor, or you could be dealing with a much bigger mechanical issue – such as a complication with your emissions system or catalytic converter.
Is it safe to continue driving with the engine light on?
You should get your car checked out as soon as possible. By continuing to drive, you risk causing further damage to your engine. Ask a mechanic to take a look. They'll run a diagnostics check to pinpoint where the problem is. It could be very minor, but ignoring it might lead to major consequences.
Coolant warning light
This amber thermometer light tells you that it’s time to top up your coolant levels. Coolant keeps the temperature in your engine at a manageable level. Without it, your engine could quickly overheat, which could cause long-term damage if left unchecked.
Is it safe to continue driving with the coolant light on?
While there’s no immediate urgency to stop the car, you should avoid making any long journeys. Buy coolant at the next petrol station, head to your destination and wait for the engine to cool down before opening the coolant reservoir.
If this light often flashes up despite repeated top-ups, get your car serviced to check for leaks.
Battery warning light
This light always turns on when you start your engine but should disappear within a few seconds. If it doesn’t, your car’s electrical system may need some attention. This is something you’ll want to get checked out because it could lead to a breakdown.
The most likely culprit is a bad connection, which is a quick fix – either clean the battery connections or tighten them. Other causes might include a faulty alternator, a damaged or old battery that needs replacing or damaged cabling.
Is it safe to continue driving with the battery warning light on?
Continuing to drive with the battery warning light on could cause a sudden power failure. You may be left without lights, power steering or ABS. It’s best to pull over and call for roadside assistance before crucial systems stop working.
Oil warning light
Most people will recognise the oil warning light, but you might not realise just how important it is. The oil in your car keeps moving metallic parts lubricated.
Neglecting to refill the oil in your car could cause extensive damage and irreparable engine breakdown. Plus, the light could be a sign that your oil pressure is too low – a problem that you’ll need to fix as soon as possible.
Is it safe to continue driving with the oil light on?
It’s important to act quickly if this light comes on. Stop and pull over safely, and turn off the engine. Look for signs of a leak under the car and top up your oil if it’s low. If the oil level is okay, it suggests there’s a fault with the oil pump. Call your breakdown service because driving any further could damage the engine.
Tyre pressure light
Not all cars will have the TPMS (tyre pressure monitoring system) feature. But if yours does, it’ll tell you when the tyre pressure isn’t quite right. Your tyres might just need inflating, but it could also be a sign of a puncture.
Is it safe to continue driving with the tyre pressure light on?
Sometimes low temperatures can cause false alarms with your TPMS, but you don’t want to chance it. Under-inflated tyres can be hazardous, so watch your speed and avoid braking sharply, then stop as soon as it’s safe to do so.
Head for the nearest petrol station air pump to check your tyre pressure. The correct pressures can be found in your car manual, or on a plate on the b-pillar (the vertical metal post between the front and rear doors). If there’s a problem, top up with air or get your tyre changed at the next available opportunity.
Power steering warning light
Your power steering warning light may be accompanied with other worrying symptoms, including a stiffer steering wheel. The most common reason for this light to be on is that you’re low on power steering fluid and need a top-up. But it might also be a sign of a more pressing issue that needs investigating.
Is it safe to continue driving with the power steering light on?
We wouldn’t recommend it. If you’ve checked your fluid levels and they’re normal, head to a garage for help. While you can still drive if your power steering fails, you should take extra care. You might find that the car is harder to steer, and it could be dangerous driving at high speeds on the motorway.
Airbag warning light
Airbags are a critical safety feature of your car as they could cushion the impact of a collision. If the airbag light turns red, it means that the airbag safety system isn’t working as it should. This could be down to the airbag system itself, damaged wires or interference with the part of the seat belt that tightens in a crash.
Is it safe to continue driving with the airbag light on?
If the red airbag warning light comes on, you should get it looked at by a mechanic straight away. A faulty airbag system can be extremely dangerous. The airbags may not deploy in an accident, leaving you and your passengers without protection. They could even go off unexpectedly in the middle of a journey and cause you to crash.
Fuel warning light
As well as the dial edging into the red, many vehicles might also show a warning light when it’s time to refuel. It’s useful to know how many miles you can cover once the light’s on – and this might be in your car’s handbook.
Is it safe to continue driving with the fuel warning light on?
Yes, but for a very limited distance. How far you can go while in the red varies by car and by the way you drive. But it’s best to get your vehicle to a filling station and refuel.
A quick tip
If you can never remember which side your fuel cap is on, look at the fuel gauge on your dashboard. There should be a little arrow or triangle next to the small fuel pump symbol. This points to the side of your car the fuel hose is on.
Seatbelt warning light
If you or your passenger haven’t put your seatbelt on you’ll get a visual and audible warning. Sometimes it’s because someone has forgotten, but it could be that the belt hasn’t clicked in properly, which could be dangerous in an accident.
Is it safe to continue driving with the seat belt light on?
No, if someone isn’t wearing their seatbelt then they’re at risk of serious injury if you were to be in an accident. Stop and make sure everyone’s seatbelt is properly fastened. You could also be fined £500 if you don’t wear a seatbelt when you’re supposed to.
DPF warning light
If you have a diesel car, an amber dashboard warning light may come on if your diesel particulate filter (DPF) is blocked or the unit is filled with soot. A blocked DPF will release toxic black smoke every time you accelerate. Not only can it cause severe engine damage, but it also harms the environment.
Can I still continue to drive with my DPF light on?
DPF filters can be expensive to replace. To avoid a hefty bill, you should get the filters checked out and professionally cleaned as soon as you can.
Will my car warranty cover me?
If your car is still under warranty it’s worth checking any dashboard warning light issues you may be covered for. This may save you forking out for a large repair bill.
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With more than eight years’ experience in writing and sub-editing content, Karen started her career in fashion before making the move to insurance. She now specialises in producing clear, engaging content that helps people make better financial decisions.
Karen’s areas of expertise include insurance products, such as car insurance, travel insurance and life insurance, as well as utilities such as energy comparison.
Stephen Maunder is an experienced personal finance editor, having spent more than a decade working for consumer print and online titles. He won several industry awards for his personal finance features at Which?, before becoming Deputy Editor at Compare the Market.
Amy helps make sure you get the best value when choosing insurance. Thanks to more than four years’ experience at Compare the Market, she understands what people look for, working closely with insurance providers to offer you deals and services that are fair, easy to understand and right for your needs.
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