I have a VW Bora PD130 sport (160,000 miles),all was fine for a month,fixed the turbo inlet pipe,with new clips,then decided on a full service(oil,oil filter,fuel filter,air filter,cam belt),everything was fine until under hard acceleration (on a slip road) in 3rd,limp mode would cut in n not accelerate past 80(eventually after downshifting a few times upto 100),turning the ignition on n off worked for a few weeks,but now doesnt). the light would go out once back around the streets but still 'limp' a little,the turbo only kicks in at 4000 revs in second n wont go past 3500 before limping,ive noticed if you keep the turbo spooling it keeps boosting but if you give a second,boost goes-ive had 17964 fault code,changing the boost pressure sensor(bosch) made no difference,the airflow sensor made no differance either-on the other hand intermittently-performance comes and goes,even beating a mates pd130 mkiv golf from 90-120,so i think its summat small...no1 knows wat its is and vw dont help,they just say 'new turbo'-which isnt the case,i didnt realise i had Parking sensors till 3 months into ownership-which is intermittent and also a feint engine note through the stereo every so often-theres no exhaust smoke(no more than there should be)mpgs are 56 at 70(Mway) and around 40 combined MPG.
I think thats it lol