The check engine light is one of the most misunderstood dashboard warnings. Let's demystify what it means and how to respond.
Why It Comes On
Your check engine light is connected to your vehicle's onboard diagnostic system (OBD-II). It monitors hundreds of sensors and systems. When something falls outside normal parameters, the light illuminates.
Common Causes
The check engine light can indicate many issues, from minor to serious:
- Loose gas cap: The most common and easiest fix
- Oxygen sensor: Affects fuel efficiency and emissions
- Catalytic converter: Expensive repair if ignored
- Mass airflow sensor: Impacts engine performance
- Spark plugs/ignition coils: Causes misfires and poor performance
Should You Panic?
Solid light: Something needs attention, but it's not an emergency. Schedule a diagnostic soon.
Flashing light: This indicates a serious problem, usually a misfire that could damage the catalytic converter. Get service immediately.
What to Do
- Check if your gas cap is loose or missing
- Note if the light is solid or flashing
- Pay attention to any changes in performance
- Schedule a diagnostic scan
- Don't ignore it - problems get worse and more expensive over time
Free Diagnostics for Members
Membership Auto members get free diagnostic scans to identify the exact issue. We'll read the error codes, explain the problem, and fix it - all included in your membership.