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Engine Lights Explained: 10 Common Warning Light

Mark Reynolds
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Mark Reynolds
6 Min Read
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Your car’s dashboard is equipped with various warning lights designed to keep you informed about the health of your vehicle. While some symbols are straightforward, others can be confusing. Understanding what each engine warning light means can save you from costly repairs and ensure your car runs smoothly. In this guide, we will explain the most common engine warning lights and what actions you should take when they appear.

Contents

1. Check Engine Light (CEL)

What It Looks Like: A yellow or orange engine-shaped icon.
Meaning: This light indicates a problem with your engine or emissions system. It could be something as minor as a loose gas cap or as serious as a failing catalytic converter.
What to Do: Use an OBD-II scanner to check for error codes or visit a mechanic for a diagnostic test.

engine light

2. Oil Pressure Warning Light

What It Looks Like: An oil can symbol with a droplet.
Meaning: This indicates low oil pressure, which could be due to low oil levels, a failing oil pump, or a clogged oil filter.
What to Do: Stop driving immediately and check your oil levels. If the oil level is low, add more oil and visit a mechanic to check for leaks.

engine light

3. Battery Warning Light

What It Looks Like: A battery symbol with positive (+) and negative (-) signs.
Meaning: This suggests an issue with your vehicle’s charging system. A failing alternator, a bad battery, or a damaged charging cable could be the culprit.
What to Do: Have your battery and alternator tested as soon as possible to avoid a breakdown.

4. Coolant Temperature Warning Light

What It Looks Like: A thermometer symbol with wavy lines.
Meaning: Your engine is overheating, which could be due to low coolant levels, a broken radiator, or a faulty thermostat.
What to Do: Pull over immediately and let the engine cool. Check your coolant level and refill if necessary. If the problem persists, seek professional help.

5. Brake System Warning Light

What It Looks Like: An exclamation mark inside a circle or the word “BRAKE.”
Meaning: This could indicate low brake fluid levels, worn brake pads, or an issue with the ABS system.
What to Do: Do not ignore this warning. Check your brake fluid level and visit a mechanic for an inspection.

engine light

6. Transmission Temperature Warning Light

What It Looks Like: A gear symbol with a thermometer inside.
Meaning: This means your transmission is overheating, possibly due to low transmission fluid levels or excessive towing.
What to Do: Stop the car and allow the transmission to cool. Check the transmission fluid level and consult a mechanic if the issue continues.

7. Tire Pressure Monitoring System (TPMS) Light

What It Looks Like: An exclamation mark inside a flat tire symbol.
Meaning: At least one of your tires has low air pressure.
What to Do: Check your tire pressure and inflate it to the recommended level. If the warning light stays on, inspect for leaks or punctures.

8. ABS Warning Light

What It Looks Like: The letters “ABS” inside a circle.
Meaning: There is an issue with the Anti-lock Braking System (ABS), which helps prevent the wheels from locking up during braking.
What to Do: Your brakes may still work, but ABS functions may be compromised. Get it checked by a professional.

9. Fuel Indicator Light

What It Looks Like: A gas pump icon.
Meaning: You are running low on fuel.
What to Do: Refuel as soon as possible to prevent engine damage from running on empty.

10. Airbag Warning Light

What It Looks Like: A seated passenger with a circle in front (representing an airbag).
Meaning: There is an issue with the airbag system, which could prevent it from deploying in an accident.
What to Do: Get your airbag system checked by a professional to ensure safety.

Final Thoughts

Engine warning lights are not something to ignore. Understanding what each symbol means can help you take the right action before a small issue turns into a costly repair. If you’re ever unsure about a warning light, it’s best to have your vehicle inspected by a professional.

Do you have a warning light that you don’t understand? Leave a comment below, and our expert mechanics will help you out!

For more car maintenance tips and expert advice, visit OnlyMechanic.com.

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