TÜV tests the first time particle number – not passed purchase year 2016

At the previous TÜV tests in 2019 and 2021 no particle measurement was carried out and passed without any problems. Today the first time was tested and only because of this did not pass: max. 250,000 is: 360,000. How can one test that there were previously also the same particle values available? I suspect the diesel gas manipulation also with Volvo. Is there similar experiences ?