wats up guys... i have a 95 buick regal custom with a 3.1L engine.. it was my moms and well she gave it to me because she bought a new
car. we have had this car for almost 9 years.... the car runs fine..
its crazy the service engine light comes on but only after you hit 50 mph?? any suggestions on why this might be happening?? thanks everyone

Blue,
Run the engine codes. They will tell you what is wrong.
I believe 94 was the last year for self-diagnosising systems. You will have to get them read at a gararge.
Check with your Auto parts store, maybe they have something to help read codes.
Dave

Autozone and possibly any other automotive part store will scan the car free of charge....

I know for sure on Autozone...Walmart might be doing it now?

88-95 have the Aldl (Assembly Line Diagnostic link)Connector most of the time under the dash to the right of the steering wheel its the 96 + that OBD II (Onboard Diagnostics 2) those you will need a Tech II Scanner