Been out to this van its an inherited job, whoever went before gave up, Van is flat as a dead hedgehog, has had new egr, and new air mass, tried reading with Diagun but comms was at best intermittant, got a fault code out of the system, df094, thermoplunger relay N, open circuit, or short to earth, read various posts and got the impression that these are prone to carbon clogging any ideas anyone, to drive the van appears unwilling to rev over 3000 certainly does'nt appear to have any turbo assistance, no apparent split intake pipes or vac hoses, turbo impeller spins and has no excessive play, other than that the engine starts and runs perfectly, any thoughts on the subject would be greatly appreciated