Truck was throwing an oxygen code which was replaced and then was reset by the garage, how many key cycles does it take to reset the computer? The check engine light has not come on in about five truck starts.

Thanks,
Russell

 

It is not about how many times it starts. The computer needs to see certain things happen in order to bring the Readiness Monitors come back online.
http://www.lyberty.com/car/drive-cycle.html
Or google it for more info.