I had my 59 plate 2.0tdi A5 Sportback mapped by Viezu (economy remap). Last week the dashboard lit up and Nottingham Audi eventually diagnosed the ECU and have replaced it at a cost of over£1k. The Audi used car warranty people have said they won't cover it as the ECU was opened by Viezu and resealed.

Viezu reckon they had to open it as there is a "software lock" (added to VAG cars around 2008/2009) on the usual way to access the cars electronics, so the only way is inside the ECU itself. Audi have now said that isn't correct, the only changes made were to allow them to identify changes made to the vehicles, not restrict them.

I now have a ping pong match between Viezu and the Audi used car warranty (Allianz) as to who pays (in the meantime of course I've had to pay to get my car back).

Does anyone out there have any similar experiences or thoughts on the two sides of the argument?