My first port of call would be to check to connections to all the sensors
(oil pressure, water temp, oil temp, brake fluid level, coolant level), just
to see if its that.  Then i'd check all the obvious thing like brake fluid
level, coolant level, brake pad wear and oil level.  If thst doesnt help
perhaps check your handbook to see what will bring the STOP light on without
anything else.

Are there certain condition that occur when the light comes on?  ie is the
car cold, idling, acclerating etc