Common haldex problems, you may be missing or have a failed orange 5 amp fuse that actually actvates the electrics for DSC ESP and Haldex essentially making your car work as a front wheel drive.
Number 17 from memory, (!) <----- A logo like that is in place of where the fuse should be
Your filter can be so gunked up that there isn't adequate circulation and pump burns out.
Or my personal favourite, the cable connecting the controller to the main harness is loose, (SUPER COMMON).
Might save you some dollars, all the best.
'76 Mk1 LS
'04 Mk4 .:R32
'09 Audi S5
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