Here's the proper approach:
1. Diagnose the Problem: The first step is to find out *why* the CEL is on. You have a few options:
* OBD-II Scanner: The most reliable method is using an OBD-II scanner (available at most auto parts stores). This tool will read the diagnostic trouble codes (DTCs) stored by the vehicle's computer. The codes will give you a clue about the specific problem. You can then look up the code online (many free resources are available) to understand its meaning.
* Auto Parts Store: Many auto parts stores will scan your vehicle's OBD-II system for free. They can tell you the code(s) and often suggest potential fixes.
* Mechanic: If you're not comfortable diagnosing the problem yourself, take your Suburban to a qualified mechanic. They have the tools and expertise to diagnose and repair the issue.
2. Repair the Problem: Once you know the cause of the CEL, you need to fix it. This might involve replacing a sensor, fixing a leak, or performing more extensive repairs.
3. Clear the Code (After Repair): *Only after you've repaired the problem* should you clear the code. Many OBD-II scanners have a "clear codes" function. Some auto parts stores will do this for free as well. After clearing the codes, drive the vehicle for a short while to allow the computer to monitor the system. If the problem is truly fixed, the CEL will stay off. If it comes back on, the problem wasn't solved and needs further attention.
Do not simply disconnect the battery to reset the CEL. While this might temporarily clear the light, it won't fix the underlying issue and could erase important diagnostic information. It's crucial to diagnose and repair the problem, not just mask the symptom.
