Is it possible to repair your existing controle module? I thought that companies like this
www.modulemaster.com/
repaired ABS control modules that failed for a fraction of the cost of new parts. I've never had it done myself but I've followed other boards where people have saved a lot of money going that route. TAT is pretty quick too.
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2013 Audi TT RS (Tech Pkg, Sport Exhaust, Heated Seats, Sirius)
Retired--2007 Z4 M Coupe (Imola Red/Black, Premium Pkg, Heated Seats, XM, Bimmian stubby antenna, CDV delete, Apex EC-7--Anthracite, Goodyear F1 Asymetric 2.