SES Light on 2003 Spyder GTS

Have 120K on my 03 Spyder and just had the timimg belt and other belts changed and a new water pump. Have never had any warning lights come on for anything and after driving about 40 miles the SES light just came on. Any ideas what might be causing this?

An SES light could be just about anything. Go get the code pulled and let us know what it is.