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Passenger vehicles are one of the most significant source of pollution in the cities. The emissions production of a vehicle is strictly dependent on how the vehicle is used. This paper has the objective to characterize a Euro IV vehicle so to understand in depth the behavior in its real usage on road in terms of fuel consumption and emissions. An Honda Civic 2.0 Euro4 vehicle has been tested and the experimental results are reported. The experiments have been carried out by means of two tools: a OBD2 interface to connect a laptop PC to the vehicle for collecting engine parameters (Alessandrini et al. 2006) and the HORIBA OBS1300 equipment to measure CO, NOx, HC emissions and the exhaust gas flow, pressure and temperature. Three types of experimental tests have been made: a set of them on a dynamometer chassis and a part on road.