As my previous post above and yours indicate, in the diagram the EGR valve is attached to the first catalyst and they had to redesign the first catalyst to make the valve work as it should and therefore both need to be changed to make the car work properly (be safe). They can not just change the EGR valve as it will not fit on the old cat. I would agree the EGR valve is part of the engine (not the exhaust) and if part of the exhaust system, the first cat., has to be changed to allow fitting of the new EGR valve then that is what must happen covered by the engine warranty. At least that is my humble opinion. Anyway, it has been accepted that the old valves are faulty, there are bulletins covering it and they should just get on with it and change it. Why should a dealership be bothered, unless MrT has sent a memo saying make it difficult for the customer as they want to save themselves a few Euro. Very bad policy.