Haldex controler?

[Tuffty]

After a drive in some ice I noticed that my S3 has become 2wd
Vag com reads the controler with no problems but under fault codes it lists an error reading the modual.
Does this as i suspect, mean the controler has expired?
If so does anyone have one they would like to sell me?
Also is it a diff off the car job to change them, or are they fairly straight forward to get to?

 

[nick-barnes07]

i have one for sale, am after £60 posted for it, if it has gone 2 wheel drive it will be down to the haldex, mine recently done the same, will be fine for a month or two, but will then start locking the back wheels up and going tits up like mine also did

 

[nick-barnes07]

and the diff takes about an hour or two to do