The owner of this Mercedes-Benz ML had tried to have the particulate filter cleaned, but the faults returned soon afterwards and the vehicle no longer drove normally. Before the visit to AutoChip, the DPF had been physically removed. The engine was in limp mode, the Check Engine light was on and the turbocharger was not operating as expected. Fault code P1405 was also read.

The workshop checked the ECU software and found that the vehicle had already been modified. Given its existing configuration, prepared software was written with the DPF and EGR functions disabled. The engine started after the programming, the Check Engine light went out, and the vehicle was no longer in limp mode during the road test.

The road test confirmed that the reported warning and driving symptoms were no longer present after the software changes. It does not establish emissions compliance or confirm that the DPF and EGR systems work: the particulate filter had been physically removed, and its restoration is not shown in the video.