Catnip64
A2OC Donor
Really needs VCDS scan to see if there are any other fault codes.
You initial code indicates N239 valve, which as @audifan suggests controls the anti-shudder function, so it may be worth checking the small pipes connected to this and N239, here's a link showing the arrangement. Perhaps the valve is not fully opening and it's restricting the airflow and thus the engine power?
You initial code indicates N239 valve, which as @audifan suggests controls the anti-shudder function, so it may be worth checking the small pipes connected to this and N239, here's a link showing the arrangement. Perhaps the valve is not fully opening and it's restricting the airflow and thus the engine power?