[Solved] Audi A6 C7 4G0 2015 Facelift 2.0 TDI 190hp Ultra Diesel - AdBlue 1000km Failure & P204F Error

Hello
I have an Audi A6 c7 4g0 2015 facelift 190 hp ultra diesel
I received a message on the Ad-Blue dashboard system failure in 900 km engine start impossible !.
One error popped up after connecting vcds

1 error found:
28653 - SAE - Reserved by Document ISO 15031-6
P204F 00 [101] - 2005
Unconfirmed - Tested since erasing error codes
Frame frozen:
Error Status: 00000001
Fault priority: 2
Error rate: 1
Mileage: 56005 km
Date: 2018.04.27
Time: 17:36:02
Have you come across something like this? Maybe someone will help.

Plug in an odis or something, because this whole VCDS won't help much.

Ok, I'll try to connect.
I redone the German forum, they write something about a faulty pump and say about uploading a new software, apparently it helps, but these are just suggestions from the forum. If I can't help it, it's either ISO or complete adblue removal.

Do not remove anything, in such a young car at this course everything should be like a factory command.

Well, I have to disappoint everyone here, because yesterday I went on a 100 km small trip. The message showed 850 kilometers, then I looked 750 kilometers and suddenly I look, the message disappeared at all, it deleted itself, I have no idea how it happened. It's ok, no bugs, I was checking VCDS. Thank you for your interest in the problem that has solved itself. I did not connect to VASA because I did not make it, but I know, as you wrote, that VCDS will not cope with it.
Thank you and finish the topic.

I have to disappoint everyone here, the error that appeared I deleted the VCDS, but the message on the fiche still informed that the engine could not be started in 1000 km. Ad blue full tank, trip 100 km, the start message indicated 850 km later it indicated 750 km later the message went out by itself and everything is ok. It's some magic, it reset itself. From the forum information I know that Vas apparently supports ad-blue reset functions, but I did not have time to check (CONTROL FUNCTIONS >> MOTOR >> OBD >> ELECTRONICS OF THE J623 MOTOR >> ELECTRONIC MOTOR FUNCTIONS >> ADJUSTMENT OF ADAPTATION VALUES OF THE REDUCER TANK).
Maybe someone will have the opportunity to try what I wrote, this is also a hint from the forum.