Vauxall Movano dti 2.5 - power loss / limp mode - ablemoore

Hi, has anyone got any suggestions regarding my 2003 Vauxall Movano 2.5 dti? It has lost power but still starts and drives. It feels like the turbo is not working but there is no smoke or noise. I have had the ecu read for fault codes and it came up with... Glow plug... Crankshaft sensor... Air mas meter. I have changed the crankshaft sensor, but no change. I does not have an Air mas meter, I checked the engine and checked with vauxhall. Can't imagine a glow plug causing this problem.

I tried to locate the egr valve to check that, but can't find one...????

Any info/suggestions would be appreciated.

Thanks.