This is what Ross Rech say:-
http://wiki.ross-tech.com/wiki/index.php/16825/P0441/001089The Check Engine Light (CEL) is on. Trouble code P0441 (16825).
Tests/Procedures:
1. Check function of the N80 canister control valve. The valve is a normally closed valve that is duty-cycled open by the Engine Control Module (ECM) to purge the canister. The valve can become varnished and sticky. Verify that the valve fully opens and closes and does not leak (either by manually applying power and ground to the solenoid or activating the solenoid with a scan tool through the output diagnostic test mode).
2. The solenoid must fully open (release vacuum) when activated and fully close (hold vacuum in both directions) when deactivated.
3. Inspect the solenoid for contamination and clean as necessary.
Potential Causes:
N80 Canister Purge Solenoid
Vacuum Line
Summary
The N80 canister purge solenoid should resolve your problem and is a popular replacement
So then read this:-
http://www.golfmkv.com/forums/showthread.php?t=119267