Hi W37V,
Just had my X5 2014 F15 come up with the AdBlue system fault, i tried an OBD reader which gave me 2C3000, it also would not clear.
I am not a mechanic but know my way around a computer, I was tempted to get the ISTA+ software and run a test plan and get some more codes before returning to the main dealer / local garage.
I fear from your thread this could be expensive!
I think I found thew two diagrams with the NOX sensor and SCR metering unit
https://www.realoem.com/bmw/enUS/sho...73#18308514448
https://www.realoem.com/bmw/enUS/sho...38#13628576471
Do you think it is worthwhile doing the ISTA+ test plan?
BMW main dealer have said they would need to do this before they would work on the car! That is £162.