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Due to the constant environmental preoccupation, application of increasingly sophisticated technologies for control of motor vehicle pollutants and necessity of monitoring of such systems, the Embedded Emissions Monitoring System (OBD) was implemented with the primary function of ensuring that the pollutant emissions levels stay within the homologation limits during the whole vehicle useful life. For this reason electronic systems (such as sensors, actuators and model-based functions) are increasingly being used for powertrain control, thereby increasing the complexity of such systems. As a consequence the software fine tuning is also becoming more complex leading to increase of costs during the development phase. In this paper is presented theoretical and practical analysis of the OBD system for Otto (L6) and Diesel (L6 / P7) systems in order to evaluate the differences and identify possible synergies between both applications.