Limp mode ? possible turbo cause??

[Tony02]

Hi all, my 2004 gt tdi 140 has gone into limp mode as i have very little power, iv owned the car for nearly a year and it has always made the siren noise so I'm thinking maybe the turbo has gone? i don't have any dash light on when its in limp mode and if i stop and re start the engine its ok for a bit then goes back into limp mode again.
Any help of what to look at first would be great thanks

[Shamm]

Does blue or black smoke come out your exhaust

[Tony02]

It only blows a bit of smoke when i accelerate hard mate other than that no i haven't noticed any smoke

[Andy]

Don't keep starting the engine because if the turbo has gone,pieces of metal can circulated round back into the intake and ruin the engine

[Jimbozzr6@gmail.com]

don't know if its any help to you but I had a similar problem on a vw crafter. it kept going into limp mode and loosing power mainly under heavy boost going uphills, turn off ignition and restart and it would be fine again for a while. eventually the turbo blew completely and when I replaced it had no more issues. sounds like same symptoms to me and I personally think it was the variable vanes sticking.