Here's why and what you *can* do:
* The CEL indicates a problem: The light isn't just a maintenance reminder. It means the car's onboard diagnostic system (OBDII) has detected a fault. Ignoring it could lead to more serious damage and potentially unsafe driving conditions.
* OBDII Scanner Needed: To accurately reset the light, you need an OBDII scanner that can read and clear diagnostic trouble codes (DTCs). These scanners range in price from inexpensive basic ones to sophisticated professional tools.
* Temporary Reset (Not Recommended): Some people try disconnecting the battery's negative terminal for a period (e.g., 30 minutes). This *might* reset the light temporarily, but it won't fix the underlying problem and is unreliable. It also risks losing radio presets and other settings.
What you SHOULD do:
1. Get the Diagnostic Trouble Code (DTC): Buy a relatively inexpensive OBDII scanner from an auto parts store or online. Plug it into the car's OBDII port (usually under the dashboard). The scanner will read the DTC.
2. Research the DTC: Look up the code online (many websites and forums explain common codes and their meanings). This will tell you what system is malfunctioning.
3. Fix the Problem: Address the root cause of the problem. This could involve replacing a sensor, fixing a leak, or other repairs.
4. Clear the Code (after repair): Once you've fixed the problem, use the OBDII scanner to clear the DTC. The CEL should then turn off. If it stays on after a few driving cycles, there's likely another issue.
In short: Don't just try to reset the light; find out *why* it's on first. A cheap OBDII scanner is a valuable tool for any car owner. If you are uncomfortable working on your car yourself, take it to a mechanic for diagnosis and repair.
