Here's the proper approach:
1. Diagnose the Problem: The check engine light is accompanied by a Diagnostic Trouble Code (DTC). You need to retrieve this code. You have a few options:
* OBD-II Scanner: The most reliable method is using an OBD-II scanner. These are relatively inexpensive and readily available at auto parts stores. Plug it into the OBD-II port (usually under the dashboard) and it will read the DTC. The code will be a number (e.g., P0171).
* Auto Parts Store: Many auto parts stores will read the code for free. Just take your Windstar to them.
* Advanced Auto Parts (and others): Some auto parts stores offer free code reading and even printouts of the codes and their potential meanings.
2. Research the Code: Once you have the DTC, look up its meaning online. Many websites (like the Haynes repair manual website, or dedicated automotive forums) will explain what the code means and potential causes.
3. Repair the Problem: Based on the code and your research, fix the underlying issue. This might involve:
* Replacing a faulty sensor (oxygen sensor, mass airflow sensor, etc.)
* Fixing a leak in the intake system
* Addressing an issue with the ignition system
* Repairing or replacing a catalytic converter
4. Clear the Code (After Repair): *Only after you've fixed the problem* should you clear the code. Many OBD-II scanners have a "clear codes" function. Some scanners even allow you to erase specific codes. Alternatively, you can disconnect the negative terminal of your battery for about 15-20 minutes. This will often clear the code, but it's less reliable than using a scanner.
Important Considerations:
* Don't just clear the code: Clearing the code without fixing the problem is pointless. The light will likely come back on.
* Intermittent Problems: Sometimes, the problem is intermittent and might not be immediately apparent. After clearing the code, drive the vehicle for a while to see if the light returns.
* Professional Help: If you're not comfortable diagnosing and repairing car problems yourself, take your Windstar to a qualified mechanic.
In short: Focus on fixing the *cause* of the check engine light, not just the light itself. This is crucial for the long-term health and reliability of your vehicle.
