The Mercedes-Benz system showed the remaining distance before a driving restriction. The display shown in the video indicates about 445 km. Diagnosis identified problems with the NOx sensor and SCR catalyst; the technician said the catalyst might be clogged and the sensor was no longer working properly.

The video discusses the possibility that AdBlue fluid quality may have contributed to the catalyst problem, but no specific cause is confirmed. Each vehicle and component requires its own assessment, so fault codes alone cannot establish whether the catalyst can be cleaned or must be replaced.

Further software work is mentioned at the end of the video, but the work itself, its outcome and a follow-up inspection are not shown. This article therefore describes only the symptoms visible during diagnosis; it does not claim that the fault was fixed or that the vehicle passed inspection.