This BMW failed its roadworthiness inspection because the engine reached an excessive speed during the test. The inspection document recorded 4,550 rpm, and the exhaust gas or opacity test was not completed.

A review of the control unit software showed that the car had already been remapped and its maximum engine speed limit raised. The ECU calibration was adjusted to return the limit to the factory value cited in the video, approximately 4,000 rpm. The existing engine power was retained.

A raised no-load engine speed limit does not, by itself, increase engine power, but it can interfere with the inspection procedure. A repeat inspection is not shown in the video, so the result after the change cannot be confirmed.