Resetting the light without addressing the underlying problem is a bad idea because:
* You'll ignore a potential serious issue: The light is there to warn you of something that could damage your engine or cause safety problems.
* The problem will likely return: The root cause will still be present, and the light will likely come back on.
* You may void your warranty (if applicable): Some warranties require diagnosed and repaired problems, not just resetting the light.
Instead of resetting the light, follow these steps:
1. Obtain the Diagnostic Trouble Code (DTC): You can do this using a code reader (available relatively cheaply at auto parts stores). This code will tell you exactly what the car's computer thinks is wrong.
2. Research the DTC: Once you have the code, search online (e.g., using the code and "Chevy Cobalt" as search terms) to understand the potential issue.
3. Diagnose the problem: Based on your research, try to identify the cause. This might involve checking gas cap tightness (a common but less serious cause of a CEL), visually inspecting components, or further diagnostics.
4. Fix the problem: Repair or replace the faulty part.
5. Clear the code (after repair): After fixing the problem, *then* you can clear the code using your code reader. Many readers have this function built-in. Some advanced readers can even help you diagnose the issue.
In short: Don't reset the light. Fix the problem. If the light comes on after refueling, the loose gas cap is a possibility, but check that first; it's a very simple fix. If it's still on after tightening the gas cap, get the code read.
