New figures from the Central Statistics Office show a slight dip in the total number of vehicles registered in September.
The CSO said the total amount of vehicles registered - including new car sales, goods vehicles and imported or second hand cars - slowed by 1.1% to 6,562 last month from 6,636 the same time last year.
Today's figures show that new cars sales rose by 34.4% to 4,376 in September from the same time last year.
The number of new goods vehicles - which some view as an indicator of how the economy is faring - jumped by 52.8% to 1,485.
But the number of used or imported cars licensed for the first time dropped by 7.6% to 4,376.
The CSO noted that the highest number of new cars sold last month by make was Volkswagen, followed by Toyota, Ford and Renault.
