Most all of today’s modern vehicles have a computer on board. When the electronic control system finds a problem it cannot adjust, this computer turns on the warning light and stores a diagnostic trouble code (DTC) in its memory. This code helps your mechanic pinpoint the source of a potential problem, from a loose gas cap to a misfiring engine.
Here is what to do when the “Check Engine” light comes on:
- Check the Gas Cap – Take it off and then re-tighten it. If the cap is loose or cracked, fuel vapors leak out and can throw the whole fuel system off, reducing gas mileage and increasing toxic emissions.
- Slow Down – Reduce the strain on the engine until you can get the cause of the check engine light checked out.
- Reduce the Weight – If you’re pulling a heavy trailer or the trunk is loaded, the engine is probably working harder than it is designed for.