I was running down the highway last week when I bumped my Sprintbooster adjustment switch from off to the middle setting. Throttle adjusted appropriately and I left it on for the remainder of the drive. When I got to the house the check engine light was on, car running fine. I started the car again, light on. One more time, light off. I left the code there, and Ive been driving for a week. No more light, just curious if anyone else has noticed CPS codes or failer after using a Sprintbooster and adjusting the settings while in motion. Im not sure exactly how the instructions read, but common sense tells me that you should adjust it in neutral or park with the car running and stationary.