I have a 2003 A4 3.0. My car has been idling rough for a while now but no one can really seem to pinpoint the problem because it hasn't thrown any codes. Well today my check engine light came on and I ran to auto zone and had the codes read...here are the results:

OEM Number to Cross: P0441

Audi didn't show up on their list but VW did...

Definition
EVAP system incorrect purge flow
Explanation
Blocked vapor canister
Probably cause
1 - Faulty vent solenoid
2 - Faulty purge control solenoid
3 - Faulty fuel tank pressure sensor

I Googled a lot of this and couldn't find much on it so I'm hoping someone can help me out.

 

16825
P0441
EVAP Emission Contr.Sys.Incorrect Purge Flow
Has absolutely nothing to do with the engine performance. The EVAP system basically traps fuel vapors and re directs them back into the intake of the engine to burn off, instead of it going into the atmosphere, hence why its called EVAP. Its strickly an emmisions system that won't affect the engine performance in any way shape or form. You need a vag com so we can look at data blocks like: fuel trim, MAF data, O2 sensors etc. Without that, we can't do anything for you.