hey guys so the other day my over drive light started flashing, i pulled the lug of the battery to reset the computer i drove a nice ways and it started again i have noticed anything bad yet but i went and bought an innova obd2 and it didn't pick up any errors at all, guys have any ideas?

also i was wondering when I'm driving in the city should my "od off " light be on or off?

 

Year make and model are needed! Engine size helps too.