Just for interest.
Mine is a 2004 3.0 D3 TDI.
I had it remapped, then a while later the ECU died with me stuck at the roadside. Replaced the ECU with a used one from Germany, my Indie fitted and then remapped it for free. Very good result. Now some eight? months later and still good.
I have never had transmission hunting at any speed (lots of 30mph) with either of the ECUs, before or after mapping.
OK mapping gave me much more oomph and better fuel consumption. Well worth doing.
My Indie tells me that the ECU is a common one used in plenty other marques in particular Range Rovers, just a different map, so should be cheapish to replace. As long as you know what map to programme in
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)