Cannot say for D3 but on A6 C5 it is permanently live. Easy enough to test though, just try it with ignition off either the actual lighter itself or something like phone charger and you will see.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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