No, thats got nothing to do with Ford. The calibration depends on the wheel size. In the meantime Marc Baldwin had the kindness to help.
The correct code on a Plus 4 with 195/60 tyres is (00)5360. The routine is entered by pressing the reset button WHILE turning the ignition - thats what I did accidentally.
He thinks the reading should still be OK with 195/65 tyres and he'll find out about the correct data for the Roadster Sport with 205/65. Thats the dimension I'll probably go for. Mine needs two tyres in the rear anyway.
