Check Engine Light Meaning: What It Really Means
The check engine light on your dashboard can be confusing and intimidating. Is it something minor—or a major problem waiting to happen? At TLM Auto Parts, we’re breaking down what your check engine light means, and what steps you should take when it comes on.
What Is the Check Engine Light?
The check engine light (CEL), also known as the malfunction indicator lamp (MIL), is part of your car’s onboard diagnostic system (OBD-II). When something in your engine, emissions system, or related electronics malfunctions, the computer turns this light on to alert you.
Common Reasons the Check Engine Light Comes On
- Loose or damaged gas cap – One of the most common and easy-to-fix triggers.
- Faulty oxygen sensor – Impacts fuel efficiency and emissions.
- Bad catalytic converter – Can lead to reduced performance and failed smog checks.
- Worn spark plugs or wires – Causes misfires, poor fuel economy, and rough idling.
- Mass airflow sensor issues – Affects fuel-air balance and engine performance.
Solid vs. Flashing Check Engine Light
- Solid light: Non-urgent, but should be diagnosed soon.
- Flashing light: Indicates a severe problem like a misfire. Stop driving immediately and seek professional help.
What to Do When It Turns On
- Check your gas cap. Make sure it’s tight and not cracked.
- Note your car’s performance. Any loss of power, odd sounds, or stalling?
- Use a code reader. An OBD-II scanner will give you the specific trouble code.
- Visit a trusted mechanic. Or contact TLM Auto Parts to help find what part may need replacement.
Need Replacement Parts or Diagnostic Help?
TLM Auto Parts offers quality sensors, spark plugs, and emission components to help solve your check engine issues fast.
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