Hi Folks,

I could use some help, I have what appears to be a pretty serious problem with my car. On the motorway I got a fault, "Adblue System Fault, no restart in 1000km. When I got home I did a scan with an OBDeleven and got the following error code.

01 Engine

System description: R4 2,0L EDC
Software number: 04L906021FE
Software version: 8243
Hardware number: 04L907309
Hardware version: H23
ODX name: EV_ECM20TDI01104L906021FE
ODX version: 002007
Long coding: 0A194012242401080000

Trouble codes:
P204F00 - Reductant System Performance Bank 1
static

I had just put in adblue 2 days before I got the error, but I topped it up again and made sure it was completely full. I reset the error code and drove for 100km. The error code above did not return, but the adblue countdown has continued and is now at 800km. I also tried a hard reset on the reductant control module, the original error was on the engine module, but I wasn't sure if hard resetting that is a good idea.

I'm reading some horror stories about what this error can be, some people have paid upward of 2K to get NOX sensors and other parts replaced. Anybody got any ideas before I get the vaseline and go to the dealership?