The theme of performance measurement, complemented by the presentation of modern emission test procedure is first treated in the present work in the due extent and deliberately coupled. For example, the meaningful measurement of C0² emissions by vehicles only with full mapping of the engine speed range makes sense. On the other side can be an extremely valuable diagnostic tool, a dynamometer and the appropriate operational infrastructure in conjunction with a modern Abgasprüfeinheit. After a brief introduction author Florian Vierling describes the historical origins of dynamometers in order afterwards to give a comprehensive overview of various designs and dimensions variants as well as the physical background. Following Vierling deals with structural and workshop technical conditions. The actual measurement performance he describes in the next chapter. In detail Vierling looks inter alia at the interaction between wheels and vehicle tires, the correct fuse of the vehicle, the sound, the subject matter, automatic vehicle or all-wheel 'and possible differences between, Life-data' and OBD information.