1996 Pontiac Trans Am Service Engine Soon Light and Low Coolant Light?

The Service Engine Soon light came up this morning and I'm wondering why... the car has fresh oil, fresh coolant, and the gearbox is properly lubricated. The air filter was a bit dusty, but not filthy. The other light that is illuminated is the Low Coolant light. Not sure why that one is on either; coolant is where it should be and it's fresh. Any ideas as to why these lights are on? The car has 131,800 miles and is a 6 speed manual shift.