Well I got a CEL the other day for TPS out of range. After driving for a while it will turn back off. I have actually gotten it a few times now and its always the same code. It also seams to be coming on under the same conditions everytime. If you drive between 4-5k getting ready to boost when you close the throttle it will throw a cel, and the only thing i can think of is the maf is to close to the turbo so in the upper rpm's when you close the throttle the spinning cmpressor wheel is causing air to move across and the maf, the ecu is veiwing this as load going up with 0.0 TPS value so it throws the CEL.