My check engine light came on car stoped on 2013 Ford Focus what could cause this?

Other answer:

Chezzy Rat:
Over 2000 different things can trigger a check engine light. Go get your computer scanned.
Any of a 100 reasons.

You need a mechanic to check the error codes from the computer, and probably do some more diagnosis stuff, THEN he can tell you. Could be anything from a blown fuse to a blown engine.

DR + Mrs Bears face:
Hi simple technology has a built in system to make sure a car gets serviced when it has covered so many miles. so the system trips a service light to show.
The engine needing checking.