basicly ... its booked into audi to have this replaced on thursday , but ive searched the internet and found exactly were it is and how to change it and ive found somewere to buy one from . But what ive stumbled across is someone saying after replacing it , the sensor will need callibrating..ive only seen this on one post , is this right? . or is it literally plug it in and its all done ? ....help asap before audi take £280 of my moneys!