2003 Citroen C5 Citreon Into Limp Mode Had Dpf Removed Remapp Still Fault That

my citreon goes into limp mode i have had the dpf removed and a remapp still goes into limp mode the fault that flags up is anti pollution fault/esp/service managment light all these faults come up when driveing over 50/55 when i stop and turn off the engine it seems to reset i have been told that if i remove the egr and blank it off this willcure the prob is this true????