The dashboard of this 2017 Audi A4 B9 3.0 TDI showed about 170 km remaining before the AdBlue system would restrict engine starting. Diagnostics found faults related to the NOx sensor and AdBlue system, along with an incorrect AdBlue level reading.

The owner chose not to repair the SCR components and instead requested that the corresponding functions be disabled in the engine control unit software. The Bosch MD1CP004 unit was removed, its software read and modified, then refitted.

After reprogramming, the AdBlue warnings were no longer displayed. A separate DPF fault still needed attention: the video mentions an intention to retain the filter and attempt regeneration, but does not show the result. The AdBlue software changes should therefore not be treated as a confirmed DPF repair.