Here's what you should do:
1. Get a Diagnostic Code: The flashing light usually means a serious issue requiring immediate attention. You need to retrieve the diagnostic trouble code (DTC) stored by the car's computer. This can be done a few ways:
* OBD-I Scanner: For a 1988 vehicle, you'll need an OBD-I scanner, not the more common OBD-II scanner used in later cars. These are less common now, but you might find one at a parts store or online. They connect to a diagnostic port under the dash.
* Paper Clip Method (Sometimes works, but not reliable): Some older vehicles allow you to retrieve a code using a paper clip to jump two pins in the diagnostic connector (Consult a wiring diagram for your specific car to know which pins). This method is unreliable and may not work, or provide incomplete codes. It's far better to use a scanner.
* Mechanic: The easiest and most reliable method is to take your car to a mechanic. They have the tools to read the code quickly and accurately.
2. Identify the Problem: Once you have the DTC, you can look up its meaning in a repair manual specific to your 1988 Pontiac Bonneville SSE or online resources. This will help you pinpoint the problem.
3. Repair the Problem: Once you know what's wrong, you can fix it. This could be anything from a simple sensor replacement to a more complex repair. Again, a mechanic might be necessary for complex repairs.
4. Clear the Code (After Repair): *Only* after you've addressed the underlying problem, you can clear the code. Some OBD-I scanners allow you to clear codes, or a mechanic will do this as part of the repair process. Simply disconnecting the battery will sometimes clear the code, but it won't fix the problem.
Important Note: A *flashing* Check Engine light is a serious warning sign. Driving with a serious engine problem could cause significant damage to your engine, leaving you stranded, or even creating a safety hazard. Don't delay getting this checked out. Ignoring it could be costly in the long run.
