* Get the diagnostic trouble codes (DTCs) read: This can be done in a few ways:
* OBD-II scanner: Buy a relatively inexpensive OBD-II code reader from an auto parts store or online. Plug it into the car's OBD-II port (usually under the dashboard) and it will display the trouble codes.
* Auto parts store: Most auto parts stores will read the codes for free. They can even give you a preliminary interpretation.
* Mechanic: A mechanic will have the best equipment and expertise to read and interpret the codes.
Once you have the DTCs, you can look them up online (many websites offer DTC lookup) or provide them to a mechanic for diagnosis. The codes will give a much better idea of the potential problem, which could range from something minor (like a loose gas cap) to something serious (like a failing catalytic converter).
In short: The check engine light itself doesn't tell you *what* is wrong, only that *something* is wrong. You need to get the codes read to diagnose the issue.
