The owner of this Mercedes-Benz R 320 reported very sluggish acceleration and a lack of power. The car had already been checked by other workshops, but the cause had not been found. These symptoms do not always mean the turbocharger itself is faulty; engine control software can also be involved.

Diagnostics found an incorrect ECU software configuration following earlier changes to the exhaust emissions system. The turbocharger actuator was also checked. After the software was corrected, actuator movement and the engine’s response to the accelerator improved.

The car was then road-tested. The video shows the engine revving and the vehicle pulling noticeably better than before the repair. If a turbocharger does not respond or the engine feels sluggish after previous software changes, it is worth checking the control unit calibration before replacing parts. No dynamometer figures are provided in the video.