toss a obd1 reader on it, or you can use a paper clip lol. i would recomend hooking a obd reader to it
if u can find your diagnostic port u can route a paper clip between the port with two wires attached then turn on the ignition (but dont start), watch the check engine light and it'll flash.... Long flashes go by 10's, short flashes go by 1's... so for example long, long, long, short, short, short, short, short, short, short....equals 37. so u just saved yourself about 100 dollars by doing this stuff by yourself, then get a code sheet for your car and if its a simple problem u can fix the rest by yourself.
or
Try disconnecting the battery for about 30 seconds or so to get the check engine light to reset. The light comes on because there is a problem, you should read the trouble code or have a mechanic read it and fix the problem if there is one otherwise the check engine light will come back on.