Drive cycle

The check engine light returning has nothing to do with needing a drive cycle to clear. It means that while you were driving the vehicle, the engine's computer detected an unresolved fault you must resolve. A P0340 almost never means that it needs a CMP sensor. That's a pure guess not following any proper procedure with a proper diagnostic tool handy to assist in monitoring data. Before you spend hundreds of dollars on guesses, please seek the assistance of a trained professional at a local shop near you. http://repairpal.com/ford-within-10-miles-of-lake-havasu-city-arizona-86404