[Capt.Aidan]

@Bracus I have dealt with similar issues and codes throughout 2021 and part of 2022 on my '15 TDI Exec.

Codes used to come in bunches. P229F, P204F, P207F, P2OEE. These codes will continue to reappear if not properly fixed, and will eventually give you a no start countdown.

Dealer had no idea what was going on and replaced multiple NOX sensors (front and rear), as well as the catalyst.

After almost a year of dealing with the issue every 5-10K kms, the dealer found a vacuum leak on my EGR outtake which was supposedly throwing the sensors off.

I only deal with a private mechanic now, who also replaced the clamp that holds DEF injector, and I have not had any issues for almost 35k kms.

Hope this helps.