Have a good day Alex .
about problem with your 2010 Audi A4 TFSI , it can be many other then turbocharger problem such as : old spark plugs , bad PCV valve , carbon build up in intake ports.
especially for turbochargers faults engine light shut be on . in your case light off.
but to give you exactly explanation what going on , we need to inspect your car .
wery common problem is carbon build up , for that problem we have special solution , same as dealer used : walnut shells blasting equipment.
for turbocharger replacement we have good option with used one with low mileage and warranty include in case you need one , it will cost more then double cheaper .....
all the best . hope is helpful for you .