Here's what you need to do:
1. Find out *why* the light is on: A 1992 Park Avenue uses an OBD I system. You'll need a code reader specifically designed for OBD I systems (often called a "scan tool"). These are less common than OBD II readers, but you can still find them online or at some auto parts stores. The code reader will give you a diagnostic trouble code (DTC).
2. Diagnose the problem based on the DTC: Once you have the code, you can look it up in a repair manual for your specific vehicle year and model (a Haynes or Chilton manual would be helpful). This will help you understand the potential cause of the CEL.
3. Repair the problem: This is the crucial step. The Check Engine Light won't go off until the underlying issue is fixed. This could be anything from a faulty sensor to a more serious mechanical problem. You may need to take it to a mechanic if you're not comfortable performing repairs yourself.
4. After repairs, the light may clear itself: Once the problem is resolved, often after a few driving cycles (start and stop the engine a few times), the Check Engine Light should turn off automatically. If it doesn't, you might need to have the computer system checked by a professional to ensure the problem is truly resolved.
Important Note: Simply disconnecting the battery will *not* reliably clear the code on an OBD I system. While it might temporarily clear the light, the underlying problem will likely remain and the light will come back on. This is a dangerous practice as it prevents you from knowing about potential issues affecting your car's safety or performance.
Focus on fixing the problem, not just the light. Getting the diagnostic code is the only reliable way to proceed.
