Here's the proper approach:
1. Diagnose the Problem: The first and most crucial step is to find out *why* the light is on. You'll need an OBD-II code reader. These are inexpensive and readily available at auto parts stores. Plug it into the OBD-II port (usually under the dashboard) and read the diagnostic trouble codes (DTCs). The codes will give you a clue about the problem.
2. Fix the Problem: Once you have the codes, research what they mean. You can find DTC information online (many websites and forums specialize in this), in repair manuals, or by consulting a mechanic. Address the root cause of the trouble code. This might involve replacing a faulty sensor, fixing a leak, or performing other repairs.
3. Clear the Code (After Repair): *Only after you've repaired the problem* should you attempt to clear the code. Many OBD-II scanners have a "clear codes" function. Some advanced scanners will even automatically clear the code after a successful drive cycle (a series of driving conditions that test the system).
Methods to clear codes (after repair):
* OBD-II Scanner: The easiest and most reliable method. Simply connect the scanner, read the codes (to confirm they are gone), and then clear them.
* Disconnecting the Battery: This is a less reliable method and may not always work. Disconnect the negative (-) battery terminal for at least 30 minutes (some recommend longer). This will reset the computer, but it won't fix the underlying problem. If the problem persists, the light will come back on.
Important Considerations:
* Ignoring the light is risky: Driving with a malfunctioning system can lead to more serious and costly repairs down the line.
* Professional help: If you're not comfortable diagnosing and repairing car problems yourself, take your Mitsubishi to a qualified mechanic.
In short: Don't just reset the light. Find out why it's on and fix the problem. Then, and only then, clear the code.
