Focus AdBlue System Error

The 'tank empty' error and no-start strongly suggest an AdBlue delivery problem. A faulty level sensor is possible, but with 249388 km on your 2015 diesel Focus, a blockage or failure in the AdBlue pump or lines to the injector is more likely. Has the system been regularly maintained? Any previous emissions control issues? What's the error code?

AdBlue system maintenance has been neglected. No prior emissions control problems, just followed service intervals. The error code is around 'P20E8 Reductant Injection Valve Circuit Range/Performance'. Does this confirm the AdBlue pump or line failure?

That P20E8 code reinforces the suspicion of a malfunctioning AdBlue delivery system. Given the code and your description, I'd lean towards a problem with the AdBlue pump or a blockage in the lines. You could try diagnosing it yourself, but cleaning or replacing the pump/lines can be tricky and requires specialized tools. A complete failure will leave you stranded, so I recommend a qualified workshop for diagnosis and repair. It could be a straightforward fix, but better safe than sorry.

Thanks for the advice. I'll take the Ford Focus to a professional. Hopefully, the repair won't exceed 250€. I will post the final diagnosis and resolution for others with similar AdBlue issues. Thanks again!