To properly address the check engine light, you need to:
1. Get the diagnostic trouble codes (DTCs): A 1994 Impala SS uses an OBD I system, which means you'll need a scan tool specifically designed for OBD I vehicles. You can't use a standard OBD II scanner. These older scanners can be found online or at some auto parts stores. Some auto parts stores will also read the codes for free. The codes will give you clues about what's wrong.
2. Diagnose and Repair the Problem: Once you have the codes, you can consult a repair manual (Haynes or Chilton are good options) or online resources to understand the problem indicated by the codes. Fixing the underlying issue is crucial. Simply clearing the code without fixing the problem will just make the light come back on.
3. Clear the Codes (After Repair): After you've fixed the problem, you can clear the codes. On many OBD I systems, this is done by:
* Disconnecting the battery's negative terminal: This will often clear the codes. Leave the negative terminal disconnected for about 10-15 minutes to allow the computer to fully reset. Reconnect the terminal and start the car. The light should stay off if the problem is fixed.
* Using a scan tool: The scan tool you used to read the codes might also have a function to clear them.
Important Considerations:
* OBD I limitations: OBD I systems are less sophisticated than later OBD II systems. They might not detect every problem, and the codes may be less specific.
* Professional help: If you're not comfortable diagnosing and repairing car problems yourself, take your Impala to a qualified mechanic. They'll have the tools and expertise to properly diagnose and fix the issue.
Simply resetting the light without fixing the underlying problem will not solve anything; it will only mask the issue and potentially lead to more serious damage or failure down the road. Focus on finding and repairing the root cause.
