This guide explains the most common dashboard warning lights in plain English, what they mean, and what you should do when you see them.
Why Dashboard Warning Lights Matter
Modern cars are packed with sensors. These sensors constantly check your engine, brakes, tyres, battery, and more. When something is wrong, they trigger a warning light on your dashboard.
The problem is, a warning light only tells you that there is a fault. It does not tell you exactly what the fault is. To find that out, you need a diagnostic scan.
As the Highway Code states in Annex 6: Vehicle Maintenance, Safety and Security, drivers should understand all warning displays on the instrument panel and should not ignore warning signs, as they could point to a serious fault developing.
The Most Common Dashboard Warning Lights
Here is a quick guide to the lights you are most likely to see, and what each one means.
Warning Light |
Colour |
What It Means |
How Urgent? |
|---|---|---|---|
Engine Management Light |
Amber/Red |
A fault has been detected in the engine or emissions system |
Amber: soon. Red: stop safely now |
Oil Pressure Warning |
Red |
Oil pressure is too low. Engine damage is possible |
Stop immediately |
Battery Warning |
Red |
The battery or charging system is not working correctly |
Act quickly. Could lose power |
Tyre Pressure (TPMS) |
Amber |
One or more tyres are under-inflated |
Check tyres soon |
ABS Warning |
Amber |
Fault with the anti-lock braking system |
Book a check soon |
Temperature Warning |
Red |
Engine is overheating |
Stop safely as soon as possible |
Brake System Warning |
Red |
Brake fluid is low or there is a braking fault |
Stop safely and get help |
Engine Management Light (EML)
The engine management light is one of the most common and most misunderstood warning lights. It looks like a small engine outline. Sometimes it is called the check engine light.
When it comes on, it means the car’s on-board computer has stored a fault code. This could be something minor, like a loose fuel cap, or something more serious, like a failing catalytic converter or a problem with the fuel injection system.
Amber light: The car may still be safe to drive for a short time, but you should book a car diagnostics check as soon as possible.
Red or flashing light: Pull over safely and do not continue driving. This is a serious fault.
The only way to find out what has triggered the engine management light is to plug in a diagnostic scanner. This tool reads the fault codes stored by your car’s computer and tells a mechanic exactly where the problem is.
Oil Pressure Warning Light
This light usually looks like an old-fashioned oil can. If it comes on while you are driving, it is a serious warning.
Low oil pressure means your engine is not being lubricated properly. If you keep driving, you could cause major engine damage in a very short time.
What to do: Pull over safely as soon as you can. Turn off the engine. Check your oil level. If the oil is fine but the light is still on, do not drive the car. Call for help.
Battery Warning Light
This light looks like a battery with a plus and minus symbol. It usually means the battery is not being charged properly while the engine is running.
The most common cause is a faulty alternator, a broken drive belt, or a failing battery. If this light comes on, your car could lose electrical power within minutes or miles.
What to do: Avoid using electrical features like air conditioning or heated seats. Head to a garage as soon as possible. If the car dies, you may need 24/7 breakdown recovery.
Tyre Pressure Monitoring System (TPMS)
This light looks like a flat tyre with an exclamation mark. It means one or more of your tyres is significantly under-inflated.
Under-inflated tyres can affect your steering, increase your stopping distance, and cause uneven tyre wear. In serious cases, a tyre can blow out at speed.
What to do: Check your tyre pressures as soon as possible. Inflate to the correct pressure (found in your vehicle handbook or inside the driver’s door frame). If the light stays on after inflating, there may be a slow puncture.
ABS Warning Light
ABS stands for anti-lock braking system. This system stops your wheels from locking up when you brake hard, helping you steer during an emergency stop.
The ABS warning light does not mean your brakes have failed. You can still brake. However, you will not have the benefit of ABS in an emergency, which increases the risk of skidding.
What to do: Your car is safe to drive carefully, but you should book a check with a mechanic soon. This is also a light that the MOT test looks at, so leaving it too long could lead to a failure.
Temperature Warning Light
This light looks like a thermometer in water. It means your engine is getting too hot.
Overheating can cause serious and expensive engine damage very quickly. Common causes include a lack of coolant, a faulty thermostat, or a blown head gasket.
What to do: Pull over safely as soon as you can. Turn off the engine and let it cool down. Do not remove the radiator cap when the engine is hot. Call a mechanic.
Why You Cannot Rely on Warning Lights Alone
Warning lights are a helpful first sign that something is wrong. But they are not the full picture.
Many faults store codes in your car’s system before a warning light even comes on. And when a light does appear, it often does not tell you exactly which part is failing or why.
That is where professional car diagnostics comes in. A diagnostic scan reads all stored fault codes across every system in your vehicle, including codes that do not trigger a visible warning light. A trained mechanic can then interpret those codes and tell you exactly what needs fixing.
Trying to guess the fault without a scan can waste time and money. You might replace a part that is not actually faulty, while the real problem gets worse.
Regular Servicing Helps Prevent Warning Lights
Many warning lights can be avoided altogether with regular maintenance. Keeping on top of oil levels, coolant, brake fluid, and tyre pressures goes a long way towards preventing faults from developing.
A routine car servicing appointment checks all of these things. It also gives a mechanic the chance to spot developing issues before they become bigger, more expensive problems.
Get Your Dashboard Warning Light Checked in East Ham
If a warning light has come on in your car, do not wait and hope it goes away. Book a car diagnostics check at First Auto Centre in East Ham.
Our team uses modern diagnostic equipment to read fault codes accurately and quickly. We will explain what the fault is in plain English, give you an honest quote for any repairs needed, and get you back on the road as soon as possible.
