Check engine light won't turn off
 

I brought the car in the car to get the oil change and a general check up. When i brought it in the light wasn't on and then the day i got it back the light went on. obviously there is nothing wrong with the car that i know of but does anyone know how to turn it off.

...if you're SURE (check the oil level please...) then pull the neg. battery cable or the EFI fuse under the hood.