Every driving instructor has seen that moment of panic when a dashboard warning light flicks on. But while some symbols can indicate minor issues, others signal critical failures that could lead to catastrophic – and costly – damage if ignored.
New research from Vertu Motors has revealed which warning lights are most financially damaging to overlook. According to a survey of aftersales technicians, 40% said the engine overheating light causes the most expensive repairs, followed by the oil pressure light (35%) and the engine management light (25%).
For professional trainers, this serves as a timely reminder to reinforce the importance of vehicle maintenance and early intervention with both learners and fleet clients.
Engine Overheating Light
Ignoring this light can lead to a warped cylinder head or a seized engine – potentially writing off the vehicle entirely.
- Action: Pull over safely and turn off the engine immediately.
- Tip: Switch off the air conditioning and turn the cabin heater to full to help disperse heat. Never remove the coolant cap while the engine is hot.
Oil Pressure Warning Light
Low oil pressure means the engine isn’t being properly lubricated, risking severe internal damage within minutes.
- Action: Stop safely, switch off the engine, and check the oil level after cooling.
- Tip: If topping up doesn’t switch off the light, arrange for the car to be recovered – don’t drive it.
Engine Management Light (EML)
A steady EML suggests an emissions fault (such as a failing catalytic converter), while a flashing light signals an urgent issue like a misfire.
- Action: If steady, drive cautiously to a garage; if flashing, pull over and call for assistance.
- Tip: Continuing to drive risks ruining the catalytic converter and damaging the engine further.
Encouraging drivers to respond promptly to these warnings not only helps avoid hefty repair bills but also supports safer, more reliable motoring — a message every trainer can share during lessons and vehicle checks.
1 thought on “The Three Dashboard Warning Lights No Driver Should Ever Ignore”
Why are warning lights properly covered in the theory test? Why indeed are things like headlamp levelling and exterior temperature gauge covered? What about a proper explanation of insurance cover or deeper coverage of distractions? I could go on, but what is the point?
By its actions, government has made it perfectly clear that 1750 dead and 25000 seriously injured is an acceptable casualty count.