April 8, 2026
Few things get your attention quite like a warning light appearing on your dashboard. One second you are driving along perfectly normally, and the next there is an unfamiliar symbol glowing at you from behind the steering wheel. For most drivers, the immediate reaction is a mixture of confusion and mild panic. Is it serious? Can I keep driving? Is the engine about to fall out?
The truth is, dashboard warning lights cover a huge range of issues. Some are minor and can wait. Others need immediate attention. The problem is that most people have no idea which is which, and that uncertainty is what causes the stress.
This guide covers the most common warning lights you are likely to see, what they actually mean, and what you should do when one appears. No jargon, no scare tactics, just clear information so you can make a sensible decision about what to do next.
Modern cars are packed with sensors that monitor everything from engine temperature and oil pressure to tyre pressure, emissions, brake fluid levels and dozens of other systems. When one of those sensors detects something outside of its normal range, it sends a signal to the car's onboard computer, which triggers a warning light on the dashboard.
Warning lights generally follow a colour system, similar to traffic lights. Red means something serious that needs immediate attention. Amber or orange means something needs checking soon but is not usually an emergency. Green or blue lights are informational, telling you that a system is active, like your headlights or cruise control.
That said, the colour system is not always perfectly consistent across manufacturers, so it pays to know what the individual symbols mean rather than relying on colour alone.
This is the one that worries people the most, and for good reason. The engine warning light, sometimes called the check engine light, can be triggered by a surprisingly wide range of faults. It might be something as simple as a loose fuel cap, or it could indicate a problem with the catalytic converter, oxygen sensors, ignition system, fuel injection or emissions control.
The light itself does not tell you what the specific fault is. It simply means the engine management system has detected something that is not right. To find out what is actually going on, the car needs to be connected to diagnostic equipment that reads the fault codes stored in the onboard computer.
If the engine warning light comes on and stays on steadily, you can usually continue driving carefully to a garage, but you should get it checked as soon as possible. If it starts flashing, that typically indicates a more serious fault, often a misfire, which can damage the catalytic converter if you keep driving. In that case, reduce your speed, avoid heavy acceleration and get the car looked at urgently.
This light looks like an old fashioned oil can and it is one you should never ignore. It means the oil pressure in your engine has dropped below a safe level. This could be caused by low oil levels, a failing oil pump, a leak, or oil that has degraded to the point where it is no longer doing its job properly.
Without adequate oil pressure, the moving parts inside your engine are not being lubricated properly. If you keep driving, you risk serious and expensive engine damage. If this light comes on, pull over as soon as it is safe to do so, turn the engine off and check your oil level. If the level is low, top it up before restarting. If the light stays on after topping up, do not drive the car. Have it recovered to a garage for inspection.
The battery light does not necessarily mean your battery is flat. It means the charging system is not working properly. The most common cause is a failing alternator, which is the component responsible for charging the battery while the engine is running. It can also be triggered by a worn or snapped drive belt, corroded battery terminals, or a faulty voltage regulator.
When this light comes on, your car is running on whatever charge is left in the battery. Depending on the state of charge and how many electrical systems you are running, you might have anything from a few minutes to half an hour before the car dies. Turn off anything non essential, like the radio, heated seats and air conditioning, and get to a garage as quickly as you can.
This light means your engine is overheating. It is usually triggered when the coolant temperature exceeds a safe level. Common causes include low coolant levels, a leak in the cooling system, a stuck thermostat, a failed water pump, or a faulty radiator fan.
Overheating is serious. If the engine gets too hot, it can warp the cylinder head, blow the head gasket or cause other significant internal damage. If this light comes on, pull over as soon as it is safe, turn the engine off and let it cool down. Do not open the radiator cap while the engine is hot. Once it has cooled, check the coolant level and look for any obvious leaks. If you cannot identify or fix the problem, have the car recovered rather than risk driving it.
The brake warning light can mean a few different things. The most common and least serious cause is that the handbrake is still engaged or not fully released. Check that first. If the handbrake is fully off and the light is still on, it could indicate low brake fluid, worn brake pads, or a fault with the braking system such as a hydraulic issue or ABS problem.
Brakes are safety critical. If the light stays on after releasing the handbrake, check the brake fluid reservoir under the bonnet. If the level is low, it may just need topping up, but low fluid can also be a sign of worn pads or a leak. Either way, get it checked by a mechanic sooner rather than later. If you notice any change in braking performance, such as the pedal feeling soft or spongy, do not drive the car.
The ABS light relates specifically to the anti lock braking system. When this light is on, it usually means the ABS has been disabled due to a fault, but your standard brakes should still work normally. The most common causes are a faulty wheel speed sensor, a damaged ABS ring, or an issue with the ABS module itself.
You can usually continue driving with the ABS light on, but be aware that in an emergency braking situation, your wheels may lock up because the anti lock system is not active. Get it checked at your earliest convenience, especially before winter or any long journeys.
If this light comes on, it means there is a fault with the power steering system. In cars with electric power steering, this is usually an electrical fault with the motor or control unit. In older cars with hydraulic power steering, it could indicate low fluid or a problem with the pump.
Without power steering, the car will still steer, but it will feel much heavier, especially at low speeds and when parking. It is not dangerous in itself, but it can be tiring and make the car harder to manoeuvre. Get it checked as soon as you can.
This light means one or more of your tyres has dropped below the recommended pressure. It could be caused by a slow puncture, a change in temperature affecting tyre pressures, or simply natural air loss over time.
Check all four tyres with a gauge and inflate them to the correct pressure, which you will find in the door sill, fuel cap or owner's manual. If a tyre keeps losing pressure after being inflated, it likely has a puncture and needs repairing or replacing.
If you drive a diesel car, this light means the DPF is becoming blocked with soot and needs to regenerate. The DPF is part of the exhaust system and is designed to trap harmful particles. It cleans itself through a process called regeneration, which burns off the accumulated soot at high temperatures.
Short journeys and stop start driving prevent the DPF from regenerating properly. If this light comes on, the simplest fix is often a longer drive at higher speeds, typically 20 to 30 minutes on a dual carriageway or motorway, which allows the regeneration to complete. If the light stays on after that, or if it becomes a recurring problem, the DPF may need professional cleaning or there may be an underlying issue that needs diagnosing.
As a general rule, red warning lights need immediate attention. Pull over safely and assess the situation before deciding whether it is safe to continue driving. Amber or orange warning lights usually mean something needs checking soon, but you can typically continue your journey and book the car in within the next few days.
The important thing is not to ignore warning lights and hope they go away. Sometimes they do disappear on their own, but that does not always mean the problem has gone. The fault code may still be stored in the system, and the underlying issue may still be there, gradually getting worse.
A diagnostic check is the quickest and most accurate way to find out what triggered the light. It reads the fault codes from the car's computer and tells us exactly which system or component has flagged a problem. From there, we can give you a clear, honest explanation of what is going on and what needs to be done about it.
If you have a warning light on your dashboard and you are not sure what it means or whether it is safe to keep driving, get in touch with us at Station Autoworks. We carry out professional diagnostic checks for drivers in Stowmarket and the surrounding area, and we will always explain the issue in plain English before recommending any work. No jargon, no pressure, just honest advice.