This BMW E46 with a 2.0-litre diesel engine arrived for work on its EGR programming. During the first dynamometer run, the power curve was uneven, with engine speed and load rising and falling. The cause needed to be investigated before increasing output.

As part of the checks, the mass airflow sensor was briefly disconnected. The dyno curve became smoother, indicating that the MAF needed further attention. The initial readings were not consistent with one another, so they are not a reliable basis for calculating the final power increase.

After diagnosis, the ECU settings were changed, including the EGR and MAF control, and the engine calibration was adjusted. The car was then tested on the dynamometer again. An exact final figure is not included here until the numbers mentioned in the video have been reconciled.