Yesterday was first long motorway journey with my new Mk3. Tyre Deflation warning came up.
I pulled off at next opportunity, and first off tried turning ignition off and then on, but warning still there.
So checked the pressures. Fronts 36psi, rears 34psi. These are hot of course so I didn't take too much notice of the values, but was satisfied there was no tyre deflation going on.
So I went to the Info screen settings and chose "initialise", and after a short while it said "completed".
Carried on another 100 miles with no more warnings.
I saw something in the manual about taking half hour at motorway speeds for calibration, and presumably this drive was the first time my car had been on a motorway for half an hour. I don't know if this was anything to with it but it made me wonder how new cars get calibrated.
I will give the system one more chance, but if I get another false warning I shall turn the system off.
I remember reading another thread about this but it didn't come up in a search.