Ask Eagle - he always seems to remember where that damn thing is...
Apparently, the timer cannot be reset, it must be replaced. However, finding the timer and removing it will turn off the light - or you can just pull the light bulb itself and deal with the timer later. The emissions timer isn't the computer actually "throwing a code," it's just an automatic frammis that's designed to get you into the dealership.
I've suffered no ill effects from getting rid of the wee nuisance.
5-90