What dashboard warning lights mean
Dashboard warning lights follow a color code: red means stop as soon as it is safe, amber or yellow means book a check within days, and green or blue only tells you something is on. A flashing check engine light is the exception to amber: slow down and get the car looked at the same day. Your owner's manual has a page showing every symbol for your car.
About 15 minutes to learnTake care: injury or damage if careless
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How to do it
- Find the warning light page in your owner's manual now, before you need it, and photograph it on your phone.
- Treat any red light, such as oil pressure, engine temperature, brake system or charging, as a reason to pull over safely and switch off.
- Treat an amber light, such as a steady check engine, tire pressure or anti-lock brake light, as a reason to book a check within days.
- If the check engine light is flashing, reduce speed, avoid hard acceleration and get to a garage the same day.
- If the tire pressure light comes on, check all four tires with a gauge at the next safe stop.
- Write down which light came on, when, and anything you heard, felt or smelled, and tell the garage exactly that.
Stop and call a professional if
- Any red light stays on after a restart, or the brake warning light is on while driving.
- The temperature gauge is in the red or steam is coming from under the hood: switch off and call for help.
- The check engine light is flashing, or the car is shaking, losing power or smells of fuel.
- Several warning lights come on at once.
Common mistakes
- Driving on with a red oil pressure or temperature light to finish the trip, which can wreck an engine within minutes.
- Opening the radiator cap when the temperature light is on; hot coolant is under pressure.
- Ignoring an amber light for months because the car still drives normally.
- Assuming a light that went off by itself means the fault is fixed.
Quick self-check
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Teach this to someone
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Teach: What dashboard warning lights mean
What to say
Dashboard warning lights follow a color code: red means stop as soon as it is safe, amber or yellow means book a check within days, and green or blue only tells you something is on. A flashing check engine light is the exception to amber: slow down and get the car looked at the same day. Your owner's manual has a page showing every symbol for your car.
What to show, in order
- Find the warning light page in your owner's manual now, before you need it, and photograph it on your phone.
- Treat any red light, such as oil pressure, engine temperature, brake system or charging, as a reason to pull over safely and switch off.
- Treat an amber light, such as a steady check engine, tire pressure or anti-lock brake light, as a reason to book a check within days.
- If the check engine light is flashing, reduce speed, avoid hard acceleration and get to a garage the same day.
- If the tire pressure light comes on, check all four tires with a gauge at the next safe stop.
- Write down which light came on, when, and anything you heard, felt or smelled, and tell the garage exactly that.
When to stop and call a professional
- Any red light stays on after a restart, or the brake warning light is on while driving.
- The temperature gauge is in the red or steam is coming from under the hood: switch off and call for help.
- The check engine light is flashing, or the car is shaking, losing power or smells of fuel.
- Several warning lights come on at once.
The check question
Ask: A red oil pressure light comes on while you drive. What do you do?
Related skills
- How to read a check engine code with an OBD2 scanner
- How to check engine oil
- How to check coolant, washer and brake fluid
- Every skill in Car and Road
Words on this page
Sources
- Your vehicle's owner's manual, for your model year. Checked September 28, 2026.
Last reviewed . First published .