1993 Buick Regal Owner's Manual - Page 109

Malfunction Indicator Lamp (Service Engine Soon Light) NOTICE: If you keep drivln after a while the em-ission controls won't work as well, your fuel economy won't be good and as your engine may not run as smoothly. This could I lead to costly repairs not covered by yo warranty. I I A computer monitors operationof your fuel, ignition and emission control systems. This light should come on when the ignition is on, but the engine is not running, as a check to show you it is working. If it does not come on at all, have itfixed right away. If it stays on, or it comes on while you are driving, the computeris indicating that you have a problem. You should take your vehicle in for service soon. 107