@Derboy
Thanks for the explanation but is it easier for those of us who have 'direct tire pressure monitoring system' installed on our My18 cars? Other than taking Audi's word for it, is there any way to independently check that we have direct TPMS rather than the indirect TPMS installed?
If you have a display option in the MMI or VC showing the pressures then you have direct TPMS with the radio valves. There’s no system where you have this and not have pressures displayed. It would make no sense for Audi to deliberately spend money on installing the valves when TPMS hasn’t been specc’d on the car.