I got all my software loaded on my sisters laptop for my custom tune because my mac doesn't accept some of the downloads (exe files). Then I plug everything in and try and transfer my original tune to the pc to save a copy and send it off to be reconfigured. And the upload stops at 3%, the tune won't transfer from tuner to pc and all of a sudden my check engine light comes on, wtf?! Now I'm stumped. It could have to do with my exhaust leak but that would be convenient timing. I'm going to try again in the am, any ideas?