The tyre Pressure Monitoring System on my Vectra has started to indicate one tyre (Driver's side front) as losing pressure and brings up the warning on the displays, every time I drive it.

This happens shortly after each sensor has registered the actual pressure. Problem is that the tyre in question is the same pressure (plus or minus half a pound/sq inch) as the others and, definitely, isn't losing pressure..

Is this a fault with the wheel pressure sensor, the hub transponder or the central electronics ?

Any thoughts appreciated.