The owner of this 2009 Volvo had been dealing with excessive smoke for about three years and was preparing for a roadworthiness inspection. According to the owner, previous workshops had changed the engine software and reduced power, then installed another file after the inspection.

AutoChip checked the existing ECU software, diagnosed the car and assessed it on the road. The video states that the DPF, EGR and intake-manifold flaps had already been removed. The software was reviewed and a new calibration prepared; no dyno power figures are given.

After the software work, the smoke meter showed an average reading of 1.18. The video does not establish that this was an official inspection result, so the figure describes only the test shown.