Check engine light on..why?..reset? (archive)

I was driving home in my M coupe today and the check engine light came on when I was sitting at a light. I am pretty sure it was because the gas cap was not tightened. My brother put it on and I guess he did not turn it enough to lock it. I was drving at around 80-90 mhp for 2 hours coming home from a weekend out of town. So I think the vibration loosened it also. I checked the cap when I got home and it basically fell out when I touched it. The car did not do anything weird and drives the exact same. So, is there a way to reset the ECU to turn off the check engine light? In my old car I would just pull the positive battery wire for a minute then the ECU would reset itself when I reattached the cable. Should I take it to the dealer to make sure there is nothing wrong? Thanks.

Follow Ups:

Disconnecting battery for 5-10 minutes will reset the light. Steppenwolf 10:08 9/02/2001 (0)
Re: Check engine light on..why?..reset? Edwin Barron 18:04 9/01/2001 (0)
A few days of normal driving, & it'll reset. RoyL 15:01 9/01/2001 (0)

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