Went to work on the car today and now I can't even get rid of the code. Disconnecting the battery does nothing, even without starting it, the code is there as soon as I key on the vehicle. I'm starting to think my map sensor has gone bad. I'm just stuck here because my car is at my parents house and I don't have many tools or spare parts with me. Anyone have any input?

EDIT: Just plugged in a known good map sensor and the cel still comes on as soon as the car is keyed on. I can't even get rid of the code by disconnecting the battery...