What does your check engine light mean?
The check engine light means your car's internal computer has identified a problem with the engine or transmission. The issue could be minor, like a loose gas cap, or more serious, like a faulty catalytic converter or internal engine failure. A mechanic can read the diagnostic code to identify the problem and recommend repairs. Diagnosing the issue early can help prevent further damage and costly repairs.
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Common causes of a check engine light
Your check engine light might turn on due to one of these:
- Loose gas cap
- Engine or transmission issue
- Catalytic converter issue or theft
- Faulty spark plugs, ignition coils, or wiring
- Malfunctioning oxygen sensor
- Damaged mass airflow sensor
- Poor quality or incorrect fuel
Some of these issues are minor, while others may require professional repair.
What to do when your check engine light comes on
If your check engine light comes on, take a few steps to identify the issue and determine whether your vehicle needs repairing.
Check your gas cap
Make sure your gas cap is tightened. A loose, cracked, or missing cap will trigger the check engine light.
Check for fuel-related issues
If you recently filled up, using low-quality fuel or the wrong octane level may trigger the check engine light. For example, if your vehicle requires premium gas (octane grade 91 to 94), using regular gas may cause the engine to malfunction and turn the light on.
Reduce speed and minimize engine load
Avoid hard acceleration, towing, or carrying heavy loads until you can identify what triggered the light. This may prevent further damage to your vehicle if it's a more serious issue.
Get a diagnostic code reading
A mechanic or service center can read the diagnostic trouble code in your vehicle's computer to identify the problem and recommend repairs.
Does car insurance cover engine light repairs?
Standard auto insurance typically doesn't cover diagnostic testing or repairs for mechanical failures. Your manufacturer's warranty may cover certain issues, depending on the cause and warranty status. After the warranty expires, mechanical breakdown insurance or a vehicle protection plan may help cover certain engine and system repairs. Progressive's vehicle protection plan can offer coverage for transmission issues, engine failure, electronic system errors and more through your auto insurance policy.
Can you drive with your check engine light on?
You may be able to drive a short distance with the check engine light on, but you should have your vehicle diagnosed as soon as possible. Driving without identifying the issue can lead to more serious damage.
If the light is flashing or red, it indicates a serious problem. You should stop driving and have your vehicle inspected immediately. A solid yellow or orange light usually indicates a less urgent issue, but you should still schedule a diagnostic inspection as soon as possible.
The check engine light is different from the maintenance reminder light, which appears when your vehicle is due for routine service. The check engine light signals that your vehicle has detected a problem that needs diagnosis.
What happens if I ignore my check engine light?
Ignoring your check engine light can lead to more serious and costly damage. The problem that triggered your check engine light may get worse or impact other aspects of your car's engine or transmission.
You also may fail a vehicle inspection until the issue is diagnosed and repaired. Addressing the problem early can help prevent further damage and unexpected repair costs. If you're concerned about affording major engine repairs, mechanical breakdown insurance or a vehicle protection plan may help cover certain engine, transmission, and system failures after your manufacturer's warranty expires.
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