We have a 2011 f550 cab and chassis, we bought an edge evo htc for it, but we did not realize we couldnt put it on a "cab and chassis" i didnt know there was a difference between one with a bed and one without....anyways we put it on there our maintenance guy failed to tell us the engine light came on, we took it in they said it was the turbo waste gate sylenoid but there is no turbo waste gate sylenoid on this truck thats what the factory said, so we were wondering could we run the programmer with the check engine light on, it ran about 10000 miles with it on and ran strong and got about 4 mpg better? thanks