This 2010 Opel 1.7 diesel failed its roadworthiness test because of excessive smoke opacity. The owner had already tried to clean the filter, but the readings were still too high at the next test.

At AutoChip, the engine control unit file was checked and the calibration adjusted. The vehicle was then tested with an opacity meter. The video gives three readings — 0.75, 0.63 and 0.62 — and an average coefficient of 0.67. No unit of measurement is specified.

The technician said the car passed its roadworthiness inspection, and no pronounced black smoke was visible during acceleration after the test. This result refers to that specific test; the video does not provide long-term measurements.