My "check engine" light came on. What will it costs to have a mechanic check it? on 1994 Suzuki Swift

It came on in the morning when going to work. Not driving on highways. Was still on after work, but was able to drive home.

Asked by for the 1994 Suzuki Swift
i suggest you use a auto diagnostic tool to check your car,

Thanks for your reply. I don't know what happened, but all of a sudden it went off when I was driving to work this morning. And it's still off when I drove home!!!! Go figure!!!