Hi guys there is a car for sale locally for a real good deal and the guy said he took it to a shop and they said it needed a new crank sensor, but it needed 2of them or something. He said it will start and run but doesnt like to idle and will sometimes die. My question is, is there really 2 crank sensors or is he confused? Also how hard of a job is this to do? Im pretty mechanically inclined, but I've never worked on an audi, and dont know if ill need any special tools or whatnot.

Thanks for the help
Ryan