CEL keeps coming on

I just registered today! Have been checking out the site and i'm in love so far! Ever since I got my 97 RS the CEL keeps coming on. I tried resetting the ECU and it worked but a couple of days later it came right back on. Is there anything i should look into as to why it's coming on? Such as o2 Sensor, Alternator, etc... And is there anyway to "tap" into the ECU to get the codes to find out what's wrong. Thanks in advanced for the help guys!

take it to a parts store and have them scan it, and you will know why it keeps coming on..basica stuff, make sure that your gas cap is tight

and yes, im serious