Dashboard warning lights: what each colour and symbol is telling you
Dashboard symbols are colour-coded for a reason. Red means stop and deal with it. Amber means something is not working as intended and needs looking at. Green or blue is information only — a system is simply switched on.
The symbol tells you which system is unhappy, not which part has failed. Below is what the common lights are reporting and what is sensible to check before anyone starts replacing components.
Common symptoms
- A red light that appears while driving
- An amber light that stays on, or comes and goes
- Several lights on together after a start or a jump start
- A light that appears only when cold, when braking, or over bumps
- A light that came back shortly after being cleared
Simple checks you can do safely
- 1
Red: oil pressure (oil can symbol)
A red oil pressure warning while the engine is running means stop the engine immediately, as soon as it is safe to do so. Do not keep driving to get home. Check the oil level once the engine is off, and arrange an inspection or recovery. This light is about pressure, not just level — a normal level does not clear it.
- 2
Red: coolant temperature or steam
Switch the engine off as soon as it is safe to do so. Allow it to cool completely. Do not continue driving an overheating vehicle because serious engine damage may occur. Never open a hot expansion tank or radiator cap, keep hands away from fans and belts, and arrange an inspection or recovery.
- 3
Red: brake warning
A brake warning light, especially with weak, spongy or grinding braking, means stop driving and arrange a professional inspection or recovery. The handbrake being partly applied is worth ruling out first, but a light that stays on with the handbrake fully released is not something to drive on.
- 4
Amber: battery or charging
A battery symbol lit while driving normally points at the charging side rather than the battery itself. Check the battery terminals and earth connections for tightness and corrosion with the engine off. Do not replace a battery or alternator until a test confirms which one is at fault.
- 5
Amber: engine management (check engine light)
A steady light means a fault code is stored — get it read before buying anything. A flashing light usually indicates active misfiring, which can damage the catalytic converter quickly: reduce load and stop driving.
- 6
Amber: ABS
Normal braking usually remains, but the anti-lock function may not. Drive gently, leave extra distance, and get it inspected. Wheel speed sensors and their wiring are common areas and are far cheaper to check than to assume.
- 7
Amber: tyre pressure
Check all four pressures cold against the label in the door shut or fuel flap, and look for anything in the tread. Cold weather alone can trigger it. If one tyre keeps dropping, it is a puncture until proven otherwise.
- 8
Green or blue: information only
Lights, indicators, cruise control, main beam and similar symbols simply confirm a system is on. They are not fault warnings.
Do not buy or replace parts until the fault is confirmed, and never work under a vehicle supported only by a jack.
Warning signs: do not drive
- Red oil pressure warning while the engine is running — stop the engine immediately
- Temperature gauge in the red, or steam from the bonnet
- Brake warning with weak, spongy or grinding braking
- A flashing engine management light
- Any warning light together with a loss of steering, braking or a strong smell of fuel
If a light is on and you are not sure how serious it is, AutoFix AI works through it with you: which light, what the car is doing, and what to check — before anything gets replaced.
Common questions
What do the colours of dashboard warning lights mean?
Red means stop and deal with it now. Amber means a system is not working as intended and needs looking at soon. Green or blue simply confirms something is switched on.
Which dashboard warning lights mean stop driving?
A red oil pressure light, a red coolant temperature light or steam, a brake warning with weak or spongy braking, and a flashing engine management light. In each case stop as soon as it is safe and arrange an inspection or recovery.
What does the red oil light mean?
It reports low oil pressure, not just a low level. Stop the engine as soon as it is safe to do so, check the level with the engine off, and get it inspected. A normal oil level does not mean the warning can be ignored.
Why did several warning lights come on at once?
Multiple lights appearing together commonly point at a power supply, earth or charging problem rather than several separate faults. Battery terminals and earth connections are worth checking before anything else.
Is it safe to drive with the ABS light on?
Ordinary braking usually still works, but the anti-lock function may not, so leave extra distance and get it inspected. If braking itself feels weak or spongy, treat it as a stop-driving symptom.
Why is my tyre pressure light on when the tyres look fine?
A tyre can be well below its correct pressure and still look normal. Check all four cold against the label in the door shut or fuel flap, and look for anything embedded in the tread.
These describe what a symptom commonly suggests. They are not a confirmed diagnosis of your vehicle.
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