What to Do When Your Check Engine Light Comes On

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June 19, 2026

On June 19, 2026

That yellow engine-shaped light on your dashboard — few things create more anxiety for drivers. But don’t panic. Here’s what you should do when your check engine light illuminates.

Step 1: Don’t Panic, But Don’t Ignore It

A solid check engine light doesn’t always mean imminent disaster. It could be something as simple as a loose gas cap. However, ignoring it can lead to more serious (and expensive) problems.

Step 2: Check the Gas Cap

Believe it or not, a loose or faulty gas cap is one of the most common causes of a check engine light. Remove the cap and re-tighten it until you hear 3 clicks. The light may take a few driving cycles to reset.

Step 3: Look for Obvious Issues

Check for:

Visible fluid leaks under the vehicle
Unusual smells (gasoline, burning oil, sweet coolant smell)
Strange noises from the engine
Changes in performance (rough idling, loss of power)
Smoke from the exhaust

If you notice any of these, it’s best to stop driving and call a professional.

Step 4: Flashing Light = Immediate Attention

If the check engine light is flashing, this indicates a serious problem — typically a misfire that could damage your catalytic converter. Pull over safely and call for help.

Step 5: Get a Professional Diagnosis

Modern vehicles have sophisticated computers that store diagnostic trouble codes (DTCs). A professional-grade scanner can read these codes and tell you exactly what’s wrong. At Jeljo, we bring the scanner to you — we’ll read the codes, explain what they mean, and provide a repair estimate before any work begins.