Why no details? Can you give us more background info? How many miles on the car? Did these codes show up recently? Or is there a chance they've been sitting in there for a while? Did they come back right away after you cleared them? In general this could be as easy as a bad tank of gas and problem goes away once that gas is gone... OR it could mean your engine is not burning fuel efficiently / in a clean way and is in need of a tune up or other repairs? What's the service history? We aren't mind readers... You gotta give details if you wanna get details!