Here's the correct approach:
1. Diagnose the Problem: The SES light is a symptom, not the problem itself. You need to find out *why* the light is on. This requires an OBD I code reader. These are readily available online or at auto parts stores. The code reader will give you a diagnostic trouble code (DTC), which tells you what the computer detected. Without this code, any attempt to "reset" the light will likely be temporary and unproductive.
2. Repair the Problem: Once you have the DTC, you can research the meaning of the code (plenty of resources online) and determine what needs to be repaired. This could range from a simple sensor replacement (like the oxygen sensor) to a more complex mechanical issue. *Fix the underlying problem; the light will not go out reliably otherwise.*
3. Clear the Code (After Repair): After you've fixed the problem and confirmed it's resolved, you can clear the DTC code. There are several ways to do this with an OBD I system:
* OBD I Code Reader: Many OBD I code readers have a "clear codes" function.
* Disconnecting the Battery: Disconnect the negative terminal of the battery for about 30 minutes. This will often reset the computer's memory, but it's not always reliable and may not clear all codes.
* Jumping the Diagnostic Connector: Some mechanics use a jumper wire in the diagnostic connector to clear codes, but this method is less common and requires understanding the connector's pinout.
Important Considerations:
* OBD I is different: The OBD I system in your 1991 Camaro is much simpler than modern OBD II systems. You'll need an OBD I code reader; an OBD II reader won't work.
* Don't just reset the light: This is crucial. Ignoring the underlying problem can lead to further damage and potentially dangerous driving conditions.
In short, resetting the SES light is the *last* step in a process that begins with diagnosing and fixing the root cause of the problem. Get a code reader, find the problem, fix the problem, then reset the light.
