Modern cars are packed with electronic systems that constantly monitor critical components. When something goes wrong, the first sign is often a small warning icon lighting up on the dashboard. While some alerts are harmless or temporary, others demand immediate attention to prevent costly damage or a breakdown.
This guide explains 12 important car warning lights, what triggers them, and how you should respond. Icons may differ slightly by brand, but their meaning is largely universal.
1. Check Engine Light
The check engine symbol is one of the most familiar — and most confusing — dashboard warnings. It can indicate anything from a loose fuel cap to sensor failure, misfires, or emission system issues.
If it stays on, get an OBD diagnostic scan to identify the fault quickly and prevent engine damage.
2. Low Engine Oil Pressure
This icon points to insufficient oil pressure, which may be caused by low oil level, leakage, or worn engine components.
Check the dipstick immediately. If topping up oil clears the warning, you’re likely safe.
If the light persists, do not continue driving — low oil pressure can seriously damage the engine.
3. Engine Overheating (High Coolant Temperature)
An illuminated temperature icon means the engine is running too hot. Possible causes include:
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Low coolant
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Faulty water pump
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Damaged radiator
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Hose leaks
Continuing to drive can lead to severe engine failure, so stop the car and let it cool before investigating.
4. Traction Control Warning
The traction control symbol typically blinks when the system is actively reducing wheel spin on wet or slippery roads.
If it stays solidly lit, the system may have malfunctioned due to a sensor fault or dirt buildup. Cleaning wheel sensors often helps, but persistent warnings need diagnosis.
5. Automatic Start-Stop Indicator
In cars with start-stop tech, this icon confirms the system is conserving fuel by shutting off the engine at idle.
If the engine fails to restart when expected, there may be a battery or sensor issue that requires attention.
6. Parking Brake / Low Brake Fluid
This icon lights up when the handbrake is engaged, but if it appears while driving, it may indicate low brake fluid or system failure.
Don’t ignore brake warnings — reduced braking performance can be dangerous. Get it inspected promptly.
7. Tyre Pressure Monitoring System (TPMS)
A tyre icon with tread lines means a tyre is over- or under-inflated.
Check pressure in all tyres and inflate to the recommended level. If the light continues to glow, there may be a puncture or slow leak that requires repair.
8. Immobilizer Warning
This icon typically appears when the car does not recognise the key, preventing the engine from starting.
A weak key fob battery is often the culprit. Some cars have a designated area where the key must be placed to be read — refer to the owner’s manual for details.
9. Diesel Particulate Filter (DPF) Warning
Seen in diesel engines, this warning suggests the DPF is clogged with soot.
Short trips at low speeds worsen the problem. Taking the car on a longer highway drive at consistent speed can help burn off deposits.
If ignored, performance will suffer and repairs can be expensive.
10. Power Steering Warning
This icon signals a fault in the power steering system, which may result in heavy or difficult steering.
Possible causes include:
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A broken belt
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Electrical fault
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Sensor or wiring issues
Driving with compromised steering is risky, so get it checked before continuing.
11. Water in Fuel Warning (Diesel Cars)
Diesel vehicles often use a fuel-water separator, and this light appears when excess water collects in it.
If it stays on, the filter must be drained immediately to prevent engine and injector damage.
12. Engine Pre-Heat (Glow Plug) Light – Diesel Only
This indicator shows that the glow plugs are warming the engine before ignition.
A brief light is normal.
If it flashes or remains on longer than usual, the glow plugs or control system may need attention.
Why Understanding Warning Lights Is Important
Ignoring dashboard warnings can lead to:
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Costly repairs
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Engine damage
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Brake failure
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Poor fuel economy
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Risk of breakdown or accidents
Learning these symbols helps you respond quickly and avoid bigger problems.
Final Thoughts
Dashboard icons are your car’s way of communicating. Some are harmless indicators of active systems, but others are major red flags. Whenever a warning light stays on — especially those linked to engine, brakes, or overheating — it’s safer to stop driving and get the vehicle checked.
Staying informed is a small step that can save you a lot of time, money, and stress on the road.
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