robin100145 The P0400 code is insufficient gas flow,after suffering this problem with my 04 2.0Dti and getting the vauxhall dealer telling me it was a faulty fuel pump,it turned out to be something a lot cheaper to fix,requiring approx 2 hours of getting your hands dirty,cleaning the carbon & gunk out of the EGR valve and off the inside of the inlet manifold and the 4 swirl baffle plates, give them all a thorough cleaning,till they are more or less spotless, what I think was happening was with the carbon/gunge on, this is resulting in insufficient flow through the inlet manifold ,resulting in the spanner light coming on and the car going into limp mode, at least that was what was happening with mine, since the thorough cleaning of the above parts the problem seems to have disappeared and not returned as of yet.
Edited by Ex Spannerman - 4 hours 13 minutes ago at 9:01pm