my 2010 A4 with 66,000 miles keeps getting CEL on and off - code read out as turbo underboost. VIN # is not covered under the Audi extended turbo warranty - don't want to deal with an expensive dealer replacement. Car drives great, but will be unable to sell/trade-in until this is addressed.

Am considering the above used turbo replacement, installed by a an independent shop. Any issues? Will I need Vag-com later?