Here's what you should do instead:
1. Diagnose the problem: The most reliable way to find out why the light is on is to use an OBD-II (On-Board Diagnostics) code reader. These are relatively inexpensive and can be purchased at most auto parts stores. The code reader will retrieve a diagnostic trouble code (DTC) that provides a clue about the issue. You can then search online for the meaning of the code.
2. Address the problem: Once you know the DTC, you can try to fix the problem yourself (if you're mechanically inclined and have the right tools) or take your Fiesta to a mechanic. The problem could be something minor, like a loose gas cap, or something more serious requiring repairs.
3. Clear the code (after repair): *Only* after you've addressed the underlying issue, you can clear the code. Many OBD-II scanners have a "clear codes" function. After clearing the code, drive the car for a while to see if the light returns. If it does, the problem hasn't been fully resolved.
Important Considerations:
* Don't just disconnect the battery: While disconnecting the battery might temporarily clear the light, it won't fix the problem and the light will likely return.
* Don't ignore the light: Driving with a check engine light on can lead to significant engine damage.
* Professional help: If you're unsure about diagnosing or fixing the problem yourself, take your car to a qualified mechanic. Attempting repairs without the necessary knowledge and tools can worsen the situation.
In short, focus on *fixing the cause* of the light, not just making it disappear. The light is a warning, and ignoring it is unwise.
