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The 2005 Brazilian vehicle noise emission limits, together with the Euro III engine technology necessary to attend these limits, set the scene for this paper. In this context, it is important to evaluate the influence of Diesel cetane number on noise emission from Euro III technology vehicles. The vehicle noise emission tests were performed abroad and also in Brazil according to Brazilian norms NBR 8433/1995 (accelerating noise test) and NBR 9714/2000, (stationary noise test) using Euro III engine technology vehicles. The fuels evaluated were representative of Brazilian production and had cetane numbers varying from 42 to 52. The paper shows that there was no significantly correlation between vehicle noise emission and Diesel cetane number, with the vehicles and fuels used.