A3 Power Steering fault!

Evening!

just before Christmas the red power steering light stayed on when i started my A3. The steering is very stiff and the red light stays on all the time. Being a mechanic myself i gave it a look over and checked fuses and basic things. Ive got power down to the rack so its looking like it is needing a new/replacement rack. Ive looked on a few forums and people are saying that the rack will need coding with an Audi computer. fitting the rack is no problem for me but if it needs coding then i will have to take it somewhere that has the right computer. I'm just after a bit of advice really on the easiest way to go about it!

Audi A3 2.0 TDI 53 plate
Rack PN - IK2 423 051 AC

Thanks for your help!
Rich

Thanks for your reply NHN

I think im going to risk fitting a second hand rack and getting it coded in after. Im struggling to find a rack with the same part number as mine. will any gen 1 rack fit even with out the same number.

Thanks again
Rich