BKD engine turbos are all suspect, particularly at that mileage.
I think you'll have to bite the bullet and go for a reconditioned replacement.
I had one at 75k miles - £695 fitted and guaranteed for two years.
It will be the vanes sticking. You can get some stuff by a company called innotec which cleans out turbos pretty much still on the car. You do have to take of the inlet pipes but apart from that it seems pretty good.
AUTOINFORM ONLINE MAGAZINE: How to Cleaning variable vane turbos - YouTube
Audi a3 2.0 tdi has been going into limp mode now and then which won't let it go past 60 if I turn it off and start it straight up again it will be fine. I've had it plugged into a scanner and I said turbocharger overboosting is this likely to be a sensor ? Thanks
I have exactly the same problem on A3 2.0tdi Sportback.
Ive come round to the fact its the turbo but only gone into Limp Mode twice on the motorway with Cruise Control on.
Any suggestions for the best place to take the money guzzling beast in the North West, Bolton/Manchester area?
So when replacing the turbo, makes sense to uprate it! I already have the TBE, just need to get S3 intercooler and uprated injectors later in the year to accompany it!
Which hybrid you got N8? Stage1 your current injectors are OK, Stage 2 youll need injectors. You need the S3 cooler either way and a wider necked downpipe/decat.
Im doing mine very soon aswell