The owner brought a Jeep Grand Cherokee 3.0 CRD to AutoChip after it failed its roadworthiness inspection because of excessive smoke. A different workshop had performed DPF regeneration twice, but the problem remained.

Diagnostics showed that the particulate filter was physically missing while the ECU still contained the original software. If the filter is absent, regeneration cannot restore its function; the exhaust aftertreatment system must first be inspected and restored.

The video shows ECU software work followed by repeated checks with a smoke-opacity meter. It does not confirm that a physical filter was installed or that the vehicle passed a roadworthiness inspection, so neither is presented as a completed result.