this time last year the dreaded 2.0 TDi balance shaft fault hit my car, ouch, it also took out the turbo...so a new one was obtained and fitted by the garage, however since that dat i have noticed more turbo lag than before and now i get the car going into limp home mode with flashing `glow plug` sysmbol on the dash... a friend read the codes last week and this is what we found: scaN/MAKE/EUROPE/audi/ Systems , Control Unit, 01-Engine, Read Codes. Read Codes 00665 Turbo/Super Charger Underboost - sporadic 006-Short to Plus. If anyone has any ideas please let me know, thankyou. (next cars going tobe a petrol!) John.