Almost 4,000 cars were sold in September, according to the Society of the Irish Motor Industry, up 24% on the same month of 2013.
It brings to more than 93,000 the number of cars sold in the first nine months of the year, up nearly 30% on the same period of last year.
Close to 68% of cars sold so far this year fall into the ‘A’ category for Co2 emissions, with a further 27% classed in the ‘B’ section.
Diesel vehicles made up 73.5% of all sales in the first nine months of the year, while petrol models made up most of the remainder.
Volkswagen remains the most popular brand, making up more than 12% of sales so far this year. Toyota is second most popular with 10.6% of sales, while Ford was third at 10%.
Meanwhile, the Volkswagen Golf has been the most popular model in 2014, representing 4.6% of all cars sold, with the Nissan Qashqai taking a 4% share of sales.
SIMI has called for no increases to car-related taxation in the upcoming Budget, saying it may harm the industry in 2015.