Ecc. Shaft Sensor and Throttle Body Reset?
 

Hi,

I just wanted to ask what it's good for to reset the eshaft or throttle body position.
I mean, I know how it's done by the FAQ, but how can the throttle body position be wrong? If carbon is built up and keeps it open a bit more than it should? If you moved it by your fingers (although it goes back by itself anyway)? What about the eshaft? What does it exactly read and how can it make a mistake? Are these values from the sensor measurable from the OBD2?