Service Engine Soon dash light on 2002 Nissan Maxima

Service Engine Soon light just appeared on dash. I have 95,000 miles on car. Recently: new alternator and battery. Due for an oil change next month. Radiator does have a SMALL crack/slow leak.Car runs fine, barring needing tire alignment. What do I do?

Asked by for the 2002 Nissan Maxima
take it to a shop for a code pull and a diag. then they can give you a bid for needed repairs.