The n75 or also commonly known as the Solenoid valve can be a common fault for over boost condition for TDi's. Unfortunately my audi is experiencing this so I want to try and pin point the problem before leaving last resorts and having the turbo replaced (even though a reconditioned one was fitted last year June).

I have already had the egr cleaned out twice which seemed to have helped the problem only for a few weeks

My question is when you do a vagcom reading on the car, if the n75 was the cause of the problem would the error code that pops up specify that the n75 was the problem?