Here's the process:
1. Diagnose the Problem: You need to find out *why* the light is on. The most straightforward method is to use an OBD I code reader. These are relatively inexpensive and can be found online or at auto parts stores. The code reader will give you a diagnostic trouble code (DTC), which will pinpoint the issue. Without a code, you're essentially guessing.
2. Repair the Problem: Once you know the DTC, you can consult a repair manual (Haynes or Chilton manuals are good options for older cars) or online resources to understand what the code means and how to fix it. This might involve replacing a sensor, fixing a wiring issue, or addressing a more significant mechanical problem.
3. Clear the Code (After Repair): *After* successfully repairing the issue, you can clear the code. There are a few ways to do this with OBD I systems:
* Using a Code Reader: Most OBD I code readers also have a "clear codes" function. This is the most reliable method.
* Disconnecting the Battery (Less Reliable): While disconnecting the battery for a while (30 minutes or so) might clear the code, it's not guaranteed, and it won't address the underlying problem. The code will likely reappear if the problem wasn't fixed. This method is only suggested after the problem is properly addressed.
* Jumping the Diagnostic Connector: Some OBD I systems can be cleared by shorting specific pins in the diagnostic connector (DLC). Consult a repair manual for your specific car model to find the correct pins and procedure; this is the least recommended approach for someone without experience.
Important Considerations:
* OBD I Limitations: OBD I is a less sophisticated system than later OBD II systems. The codes are less descriptive, and pinpointing the problem may require more troubleshooting.
* Safety First: If you're not comfortable working on your car, take it to a qualified mechanic. Attempting repairs without the proper knowledge and tools could cause further damage.
* Repair Manual: A repair manual specific to your 1992 Saturn SC is invaluable for diagnosing problems and performing repairs.
Ignoring the "Check Engine" light is not recommended. The issue could be something minor that's easily fixed, but it could also indicate a more serious problem that could lead to further damage or even safety hazards if left unresolved. Always prioritize diagnosing and fixing the underlying cause.
