What Does the Check Engine Light Mean? Common Causes & Fixes
Check engine light on? Learn the most common causes — from a loose gas cap to a failing oxygen sensor — what's urgent, and how a mobile mechanic can diagnose it at your home.
Steady vs flashing light
A steady check engine light means something needs attention soon but you can usually drive carefully. A flashing light means a serious problem (often a misfire) — stop driving and get help to avoid catalytic-converter damage.
Most common causes
Loose or faulty gas cap, failing oxygen (O2) sensor, bad catalytic converter, worn spark plugs or coils, and mass airflow sensor issues are the most frequent triggers.
Why a code reader isn't enough
Parts-store scanners give you a code, not a diagnosis. The same code can have several causes. A professional reads live data and freeze-frame info to find the real fault before you spend money on parts.
Get it fixed where you are
GetAutoPros brings dealership-level diagnostic tools to your location, pinpoints the issue, and fixes most problems on the spot. The diagnostic fee is credited toward your repair.
Need this fixed? We come to you.
Get Auto Pros mobile mechanics handle it at your home or office. Upfront pricing, book in minutes.
Book a mechanic