edit: sorry took a long time typing and didnt see about pressure, although you could watch live data when cranking. on January 22, 2013, 11:14 pm, in reply to "Re: Corsa 1.3 cdti oil life exceeded and non start"
What air flow readings do you get? Have you investigated EGR? Have you got reasonable exhaust flow, or could you try disconnecting the egr pipe to allow the exhaust to breath incase the DPF is blocked?
Matt