You definitely need to pull some codes out but an obvious first move is to check that the CAC hoses going from turbo to intercooler and then to intake manifold are not split, holed or loose. Check the hose connecting the air filter to the turbo inlet as well.
Fuel problems like air in fuel or blocked fuel filter usually do not post codes but you would probably grind to a halt....I had this with a clogged fuel filter!
Bear in mind that the LHD 2006 CRD has a known problem with the cable harness going behind the Fuel Filter Head Mounting Bracket being damaged by being forced against the chassis...this causes weird problems so if you do not find the problem soon remove this Mounting Bracket and check the wire harness behind it for any damage!