Here's the process:
1. Identify the Problem: The first and most crucial step is to determine *why* the SES light is on. You'll need an OBD-II code reader. These are inexpensive and readily available at auto parts stores. Plug the reader into the OBD-II port (usually under the dashboard), and it will retrieve the DTC. This code will tell you what system is malfunctioning. Search the code online (many websites provide DTC lookup) to understand the potential issue.
2. Repair the Problem: Once you know the code, you can research the likely cause and fix it. This may involve replacing a faulty sensor, fixing a leak, or addressing a more serious mechanical issue. Do not attempt complex repairs if you lack the mechanical knowledge or experience.
3. Clear the Codes (After Repair): After you've repaired the issue, you can clear the DTCs using the OBD-II code reader. Most readers have a button or option to clear codes.
4. Verify the Repair: Start your vehicle and let it run for a while. The SES light should remain off. If it comes back on, the problem hasn't been fully resolved, and you'll need to repeat steps 1-3.
Important Considerations:
* OBD-II Port Location: The OBD-II port on a 1997 E-150 is likely under the dashboard, but its exact location might vary. Consult your owner's manual if you can't find it.
* Professional Help: If you're not comfortable diagnosing and repairing car problems, take your E-150 to a qualified mechanic. Attempting repairs without the proper knowledge could lead to further damage or injury.
* Generic vs. Specific Code Readers: While a basic OBD-II reader will work, a more advanced scanner might provide more detailed information about the DTCs.
Simply disconnecting the battery will not reliably clear the code on a 1997 Ford E-150. The OBD-II system has memory, and the code will likely return. Use a code reader to properly diagnose and clear the trouble codes after you've addressed the underlying mechanical problem.
