The manual shows the system as ABS based but, on more than one occasion, my Tyre Pressure Warning has appeared on switching the car on, in the morning, i.e. before a wheel has been turned.
Maybe there has been a modification on some models.
UPDATE.... just did some research. It seems that Ford changed the system from direct (valve sensors) to indirect (ABS based) in Dec 2014. So, depending on when your car was built, you could get either.
Edited by: number6
I was wrong once but then I could be mistaken.
2014 Bmax 1.6 Powershift Titanium X