what is the most common reason for the check engine light coming on on 2008 Toyota Tundra

i have already checked the gas cap and it is not loose

by in Warren, TX on January 10, 2013
2 answers
ANSWER by , January 10, 2013
scan codes and post so we can adv
ANSWER by , January 10, 2013
Lots of differant reasons that light would come on.