To properly address the CEL, you need to:
1. Diagnose the Problem: The most reliable way is to use an OBDII code reader. These are relatively inexpensive and available at most auto parts stores. Plug it into the OBDII port (usually under the dashboard) and it will read the Diagnostic Trouble Codes (DTCs). These codes provide clues about what's causing the light.
2. Fix the Problem: Once you have the code(s), research their meaning online (many resources are available) or consult a repair manual. This will tell you what system is malfunctioning (e.g., oxygen sensor, mass airflow sensor, etc.). Then, you'll need to repair or replace the faulty component.
3. Clear the Code (After Repair): *After* successfully fixing the problem that caused the CEL, you can clear the code. Many OBDII code readers have a "clear codes" function. Some auto parts stores will also clear the code for you for free if you bought a part from them. *Do not clear the code before fixing the problem, as this will prevent you from verifying if your repair was successful.*
Important Considerations:
* OBDII Compatibility: While 1996 was the official start of mandated OBDII in the US, some 1995 models (like the Lexus ES300) may have a partially implemented OBDII system. A code reader designed for OBDI or OBDII should work. If a standard OBDII reader doesn't work, you might need a more specialized tool for pre-OBDII systems.
* Professional Help: If you're not comfortable diagnosing and repairing car problems yourself, take your Lexus to a qualified mechanic. They have the tools and expertise to accurately identify and fix the issue.
Trying to reset the CEL without addressing the underlying problem is a waste of time and could lead to further damage. Always diagnose and fix the issue first.
