The BMW X5 F15 was tested on a dynamometer before remapping. The video gives 381 hp and 740 Nm as reference figures, while the vehicle’s initial run produced 335 hp and 665 Nm. Diagnostics showed fluctuations in fuel pressure: the requested value was around 2,300, while the actual value sometimes fell to about 2,260. The unit is not clearly stated in the video.

Diesel fuel was found inside the engine ECU housing. The team suspected that a faulty pressure sensor or regulator might be allowing fuel to travel through the wiring, but the exact cause was not confirmed. Stored NOx sensor faults were also found; the video does not confirm that the sensor was repaired.

After the ECU was remapped, the dyno showed approximately 398–400 hp and 770–775 Nm. The video also notes that the fuel pressure system and turbochargers still required checks. A calibration change does not replace that mechanical diagnosis.