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Concerning internal combustion engines (ICEs), the analysis and evaluation of combustion quality and pollutant agents has drawn the attention of public opinion and worldwide authorities. Moreover, combustion quality in ICEs affects the drivability of motorbikes/cars, a most important quality for the customers’ point of view. The possibility to monitor engine behavior is a target that every car/motorcycle OEM is seeking, so as to comply with legislated pollutant limits. As the EURO V OBD Stage II regulations state, starting from the year 2020 all the emission related components will need to be monitored. In particular, the legislator requests to monitor the frequency of misfires, due to possible damage to the catalytic converter; in fact, the malfunction of this component can dramatically affect exhaust gas pollutant emissions.