Search for: [Description = This paper presents a comparison of two approval tests for a passenger car, both the current procedure and its predecessor. The car that was the subject of the study received a roadworthiness certificate based on the NEDC test, however, the emission results were compared with the new test procedure. The analysis showed the significance of the “start\-stop” system in the conducted tests, however, assuming the original equipment of the car \(active “start\-stop” system\), the WLTP test showed higher CO2 emissions, which did not exceed the permissible emission standard for this model specified in the relevant regulation.]