Taken from Ross-tech. I did have a quick Google to see if it showed anything up and found a link which showed this. Although there is another 0 in front of the code you put up it does point towards the N80 as a possible cause.
16825/P0441/001089 - EVAP Emission Control Sys: Incorrect Flow
Possible Symptoms
Malfunction Indicator Light (MIL) active
Possible Causes
Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) faulty/jammed
Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115) faulty/jammed
Evaporative Emission (EVAP) Canister Sealing faulty
Pipes between Tank Breathing and Throttle Body leaky/blocked
Possible Solutions
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80)
Perform Output Test
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115)
Check Evaporative Emission (EVAP) Canister
Perform Basic Setting
Check Pipes between Tank Breathing and Throttle Body
Special Notes
When found in the NAR 1.8T Audi A4 1.8T check TSB 24-08-78 or 2010268/3 or Pass-Thru equivalent TSB
When found in the NAR 1.8T VW Passat 1.8T check TSB 01-09-09 or 2005554 or Pass-Thru equivalent TSB
Note: The Passat 26E5 or "R5" recall includes the same software update
Make sure the quick release lines for the N80 valve and vacuum line to LDP are not crossed.
This can also make the engine hard to start after filling up the fuel tank.
