Looks like it goes to secondary air pump. I don't think there was any harm done by it being disconnected as it only blows air in exhaust when engine is cold and running rich to burn up excessive hydrocarbons and heat up cats quicker.
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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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