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Electromagnetic compatibility and interference have become a critical factor in vehicle design specially considering the electronic scale of integration used in the vehicle to control and monitor vital functions as ignition and fuel injection, electronic suspension, ABS/RABS and others. Of course, some care procedures and tests can guarantees the vehicle electronic system integrity and security as well guarantee the driver and passengers safety too. This paper discusses the problem of electromagnetic interference in vehicle system and describes some techniques that may be used to measure and control this EMI.