Can only re-iterate that its best to get to someone who can scan it using VCDS which will give you the best chance of finding the issue - rather than taking potshots at potential failure items with the inevitable hit and miss results /costs you seem to have already experienced.
And ALWAYS ask your garage for the old part unless its been traded in/returned as part of the deal for the new part. At least YOU can offset the cost of the new part (when it doesnt solve the problem) by selling the old (still functioning) one online. 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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