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I had this code once. A new gas cap solved it. Might not be your problem, but it was probably the cheapest Passat fix I ever had. lol

EDIT: You can even try tightening your gas cap a bit more to see if it changes anything. If it does, replace.
 

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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

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.
 

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16825/P0441/001089 - EVAP Emission Control Sys: Incorrect Flow

Pipes between Tank Breathing and Throttle Body leaky/blocked

There is a large hose (13mm - 1/2" ish diameter) on the underside of the throttle body, this hose tends to get rock hard and will no longer seal around the hose barb on the throttle body causing an air leak.
The hose goes from the throttle body to the valve on top of the air filter housing.

I'm pointing this particular hose out because it is next to impossible to get access too unless the intake or the throttle body is removed, thus being very hard to diagnose.
 
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Discussion Starter · #6 ·
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

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.
Thanks for the input. Can you tell me the location of the other valve, either the N80 or N115? I replaced the valve that is position right on top of the air box already.
 
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