AdBlue issue on 2018 BR V

Based on the symptoms you describe – the AdBlue tank seemingly empty despite recent filling, the error message, stored error code, and the no-start condition – it is highly probable that you are experiencing a defect with the AdBlue output from the tank to the dosing unit. To confirm, has the error memory been checked? If so, what specific error codes were registered? Without these error codes, it's challenging to provide a definitive diagnosis.

Thanks for the reply! Yes, the garage did check the error memory, but I can't remember the exact code. They just said it was something to do with the AdBlue system and the emission standards. Is there anything else that could be causing this, or does it definitely sound like the output thingy you mentioned? Is that a common problem?

Given the additional information regarding emission standards errors, the likelihood of a defective AdBlue output from the tank to the dosing unit is further increased. While other issues within the diesel exhaust fluid (DEF) system could contribute, the symptoms strongly suggest this particular problem. This issue is not uncommon. I would suggest that you visit a workshop to resolve the error. Eventual repair costs should be around 250€.

Thanks so much for confirming my fears, haha! At least I know what to expect now. I'll book it into the garage and mention the AdBlue output issue. Hopefully, it won't cost more than the 250€ you mentioned. Cheers for the help!