Pontiac Vibe / Toyota Matrix Service for "Check Engine" light?

We have a Pontiac Vibe (same as Toyota Matrix, rebranded), and the "Check Engine" light has come on. Not related to gas cap being loose. Where's a good place to take it for service?

Heather

Probably the O2 sensor. They go all the time. If it is an old beater but still runs good with no noticeable problem I would check your manual on how to reset it and fogetaboutit.......

I reset the check engine light in my beater Pontiac van all the time.

ron young