One of my tyre valves snapped and therefore had to be replaced with a standard one whilst awaiting parts. They not have one in and will do it tomorrow. There is a tech bulletin about defective tyre valves that I had to bring to their attention. Turns out that they will do the work under warranty BUT the bulletin states categorically that this should be chargable work if the car has metal valve caps fitted. Mine doesnt so im OK but if any of you do change them for plastic ones before going into the dealer.