You don't replace the light itself. You need to find out *why* the light is on. This requires:
1. Obtaining a Diagnostic Trouble Code (DTC): This is done using a scan tool, either a professional-grade one from an auto parts store or a less expensive OBD-I code reader (you'll need one specific to OBD-I systems as the 1987 Celebrity uses that older standard, not OBD-II). OBD-I readers often involve jumping pins in the diagnostic connector to retrieve the codes, and interpretation varies based on the code itself.
2. Interpreting the DTC: Once you have the code(s), you'll need a repair manual or online resource (like a Haynes manual or a forum dedicated to 1987 Chevy Celebrities) to understand what the code means. It could range from a minor issue (like a loose gas cap) to something more serious (like a sensor failure).
3. Repairing the Underlying Problem: Addressing the problem indicated by the DTC is crucial. Ignoring the light could lead to further damage and potentially dangerous driving conditions. The repair could involve anything from a simple part replacement to more involved mechanical work.
In short, instead of focusing on replacing a light bulb, focus on diagnosing and fixing the underlying problem that triggered the "Service Engine Soon" light. Trying to simply disable the light will mask a potential serious issue.
