2007 Kia Rio Question: my check engine light just came on, we have done all the maintenance. just had

rear brakes replaced. New pads, new front tire. Anything it has needed. No codes yet can't do that until tomorrow. New timing belt at 75,000 miles. Miles now at 105,000. Every thing seems to work, my wife just is on her way to work. She is there now no problems. Total drive is 12 miles.