Here's the proper procedure:
1. Get the Diagnostic Trouble Code (DTC): You need to find out *why* the light is on. You have a few options:
* OBD-II Scanner: This is the best method. A relatively inexpensive OBD-II scanner (available at most auto parts stores) can be plugged into your car's OBD-II port (usually under the dashboard) and will read the DTCs. This code will give you a clue as to what's wrong.
* Auto Parts Store: Many auto parts stores will read the codes for free. They might even be able to tell you what the code means.
* Mechanic: A qualified mechanic can diagnose the problem and fix it.
2. Fix the Problem: Once you know the DTC, you can research the meaning online (many resources are available) or consult a repair manual. The problem might be something simple (like a loose gas cap) or more complex (requiring a sensor replacement or other repairs). Don't just reset the light without fixing the root cause.
3. Clear the Code (After Repair): After you've fixed the problem that triggered the light, you can clear the code. There are several ways to do this:
* OBD-II Scanner: Most scanners allow you to clear trouble codes.
* Disconnect the Battery: Disconnect the negative (-) battery terminal for about 10-15 minutes. This will reset the computer, but it may also clear other settings (like your radio presets). This is a less precise method and may not always work.
Important Considerations:
* Don't just reset the light: Ignoring the warning light is dangerous and could lead to more significant and expensive repairs later.
* Gas Cap: A loose or faulty gas cap is a common cause of the "Service Vehicle Soon" light. Check and tighten your gas cap before resorting to other methods.
* Professional Help: If you're not comfortable diagnosing and repairing the problem yourself, take your car to a qualified mechanic.
In short: Focus on fixing the problem, not just the symptom (the illuminated light). The DTC is the key to understanding and fixing the issue.
