Mercedes-Benz Brand Assets

Mercedes-Benz Brand Assets

505 W. Franklin St., Chapel Hill, NC 27516

Check Engine Light On? What It Means and What to Do

by Client

Short answer

Do not panic, but do not ignore it either. What you should do depends on whether the check engine light is solid or flashing.

What does the check engine light mean?

The check engine light is a general warning from your vehicle’s onboard computer. It means the system has detected that something is not operating as expected. The issue could be minor or serious, which is why the light exists in the first place.

The appearance varies by vehicle. It may be yellow or red, say “Check Engine,” or appear as a small engine icon. Regardless of how it looks, the message is the same. Your vehicle needs attention.

Can it be something simple?

Yes. One of the most common causes is a loose or improperly sealed gas cap, especially if you recently refueled.

What to try first

1. Pull over in a safe location.
2. Turn off the engine.
3. Tighten the gas cap until you hear two or three clicks.
4. Restart the vehicle and see if the light turns off after a few driving cycles.

If the light remains on, the issue likely requires a diagnostic scan.

Solid check engine light vs. flashing light

Solid check engine light

  • Indicates a problem that should be addressed soon
  • A vehicle is usually safe to drive short distances
  • Schedule a diagnostic appointment as soon as possible

Flashing check engine light

  • Signals a potentially serious issue, often related to engine misfires
  • Continued driving can cause costly damage
  • Pull over when it is safe and have the vehicle towed

If the light is flashing, do not continue driving.

Should you drive straight to a mechanic?

As a general rule, yes. If the check engine light comes on and stays on, your vehicle should be inspected by a professional. Modern diagnostic tools can quickly identify the issue, often saving time and preventing larger repairs later.

Diagnostics are typically quick, straightforward, and far less stressful than waiting for a breakdown.

Bottom line

  • Do not panic
  • Do not ignore the warning
  • Solid light means schedule service soon
  • A flashing light means stop driving and tow the vehicle

If your check engine light is on and you are unsure what to do next, contact Client to schedule a diagnostic inspection and get clear answers from trained service professionals.