Sounds like a boost leak, you will have to check all the hoses from the turbo and intercooler. Very good chance it is the resonator box orange seals that need to be replaced. Fairly straightforward for any garage to do.
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Current V70III 2.4D (163) SE Sport 4C (2008)
V70 T5 (1996)
V70 P2 D5 EUIII (2002)
XC90 V8 4.4 (2007)
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