a5 2.7 tdi help needed

hi its my first time on here so be gentle lol.



ive got an a5 2.7 tdi 2008 its done 157k, today I accelerated hardish and the orange glow plug light came on and started to flash, it went into limp mode and I couldn't really get over 30 mph , I managed to get home and turned it off.

I gave it a few mins and started it again and the light had gone off, ive just took it up and down the bypass and and it revved ok but im not convinced the turbo was there, when I slowed down it looked like it had a bit of white smoke coming out the back, when I got back home I checked the exhaust tail pipes and they were both filled with like a grey powder.



anybody any ideas ? im thinking turbo gone but I hope not it needs a service as its been asking for the past 6 weeks , could this have anything to do with it or is there a way to check the turbo ?



thanks in advance..

will fault codes show up even though their is no lights on the dash ?

thanks Karl its been ok today ,think I,ll get it serviced and code read while its in there.