I will re-confirm this info tomorrow, but I believe the P1447 code refers to a loss of vacuum pressure in the fuel vapor lines between the engine, fuel tank, collection tank (charcoal canister) and the Fuel Evaporation pump. Could be gas cap, lines, or pump itself leaking.
Options: Put a new fuel cap on (OE only, as most are not a correct fit). Clear codes. Does the code return? In how short a period? One week- when the temp gets hot (mine!), only when you overfill the fuel tank? Right away? Etc, etc
The results will send you down a path to check other areas, lines, connections and replacing the pump itself as required. Can anyone confirm if the other type of diagnotic software will activate and test the Evap control pump for deeper insight on what is setting off the code?
Helpful? 
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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