My 2015 Q7 TDI with 40,000 miles. Just recently it started making an engine noise that when investigate, appears to be coming from the throttle valve. It's a whiney-humming-type noise - like from low power steering fluid. Doesn't happen immediately - but when it starts, it slows down at idle and picks up when you rev it up. Any suggestions - solutions - thoughts? (FYI - VW Audi/emissions has been performed. Never noticed it prior to the fix and haven't driven many miles since the fix.)
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