What does it mean when the check engine light goes on?

When your check engine light (often depicted as an engine icon) comes on, it means that your vehicle's onboard diagnostic system (OBD-II) has detected a problem. This doesn't necessarily mean something catastrophic has happened, but it *does* mean there's a malfunction that needs to be addressed.

The problem could be something minor, like a loose gas cap, or something more serious, like a failing catalytic converter. The light itself doesn't specify the problem; it simply indicates that a problem exists.

What to do when your check engine light comes on:

* Don't panic: While it's a sign of a problem, it's not always an immediate emergency.

* Check your owner's manual: Some minor issues might be described in your manual.

* Get your car scanned: A mechanic or auto parts store (like AutoZone or Advance Auto Parts) can use an OBD-II scanner to read the diagnostic trouble codes (DTCs). These codes provide a much more specific indication of what the problem is.

* Don't ignore it: Continuing to drive with a check engine light on could worsen the problem, potentially causing more damage and expensive repairs.

In short, the check engine light is a warning signal. Get it diagnosed to prevent further issues.