1. Disconnect the battery: This is the simplest approach. Disconnect the negative (-) battery cable for at least 30 minutes. This resets the computer's memory, and in some cases, this is enough to clear the light. Reconnect the cable and start the car. See if the light is off. If it comes back on, it means the issue wasn't solely the EGR valve, or the problem persists.
2. Drive cycle: Some older systems will clear the light after a certain driving cycle. This usually involves driving for a sustained period at various speeds and engine loads. A good highway drive might be sufficient.
3. Check the EGR valve connection: Ensure the new EGR valve is properly seated and connected. A loose connection could trigger the light.
4. Check for vacuum leaks: The EGR system relies on vacuum. Leaks in the vacuum lines can trigger the check engine light. Inspect the lines carefully.
5. Check for other issues: If the light remains on, the issue might not be solely the EGR valve. Other problems could be contributing to the light. The EGR system is often complex and its failure can cause other issues.
Important Considerations:
* No OBD-II Scanner: You *cannot* use an OBD-II scanner on this car. They won't work.
* Professional Diagnosis: If the light persists after trying these steps, it's strongly recommended to take your car to a mechanic familiar with older vehicles. They can diagnose the underlying issue properly. Simply replacing the EGR valve without addressing other potential problems is ineffective.
* The Light's Meaning: On a car this old, the "Check Engine" light is a broad indicator. It doesn't specifically pinpoint the EGR valve; it just indicates a problem detected in the engine management system.
In short, while disconnecting the battery is the first thing to try, don't assume the problem is solved just because you replaced the EGR valve. A persistent light means further investigation is necessary.
