Instead of resetting the light, you should:
1. Get the Diagnostic Trouble Code (DTC): You'll need to get the code that triggered the CEL. This can be done in a few ways:
* OBD-II Scanner: The most reliable method is using an OBD-II scanner (available at most auto parts stores). These plug into a port under your dashboard (usually near the steering column) and will display the DTC.
* Auto Parts Store: Many auto parts stores will read the code for free.
2. Identify the Problem: Once you have the DTC, look up its meaning in a repair manual or online (many websites provide DTC lookup). This will give you a clue about what's wrong.
3. Fix the Problem: Repair the identified issue. This might be something simple like a loose gas cap, a faulty sensor, or a more serious problem requiring professional repair.
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 vehicles will automatically clear the code after a certain number of successful driving cycles (the engine running for a certain amount of time and distance), provided the problem is actually fixed. If the problem isn't fixed, the light will return.
Simply disconnecting the battery for a short period might temporarily clear the light, but the underlying problem will still exist and the light will likely return. This is not a recommended solution.
In short: Don't just reset the light. Find and fix the problem causing it. A 1999 vehicle likely has a simpler system than more modern cars, so the repair could be relatively inexpensive. Ignoring it, however, is never a good idea.
