To understand what's wrong:
* Consult your owner's manual: This is the most important step. The manual will have a section explaining the warning lights, including the engine symbol (often depicted as a check engine light – a stylized engine with a "check" symbol). It might even provide troubleshooting tips.
* Use an OBD-II scanner: These relatively inexpensive devices plug into your car's OBD-II port (usually under the dashboard) and can read the diagnostic trouble codes (DTCs) stored by your car's computer. These codes provide specific details about the problem. Many smartphone apps can also perform this function when paired with a Bluetooth OBD-II scanner.
* Take it to a mechanic: If you're uncomfortable troubleshooting the problem yourself, a qualified mechanic can diagnose and repair the issue.
Ignoring the engine light is risky. Driving with a serious engine problem can cause further damage to your vehicle and potentially create safety hazards.