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Shorter new vehicle development time require new engineering methods in the concept and design phase. Therefore methods, which allow an early screening of design alternatives, have been developed and integrated in the design processes. This includes experimental (mostly bench tests) as well as simulation tools. Similar trends can be recognized in the area of exhaust gas aftertreatment. Ever tightening emissions regulations make it necessary in early stages to determine the performance of different aftertreatment concepts. Due to the fact that over 90% of the unconverted emissions occur before the converter is at operating temperature, the heat-up and light-off behavior of the converter is of major importance. In this context a numerical model has been developed to simulate the heat-up and light-off behavior.