NCT centres in Dublin, Limerick and Laois have the highest pass rates in the country this year.
Deansgrange in the capital tops the list, with a pass rate of 62 per cent.
Nearly 906,000 full NCT tests had been carried out in Ireland this year up to last Saturday. Over 54 per cent of them passed, and nearly 46 per cent failed.
After Deansgrange, the second highest pass rate is Abbeyfeale in Co Limerick, at 61 per cent while Portlaoise has a rate of 60.5.
The lowest in the country is Derrybeg in Co Donegal, with a rate of less than 39 per cent.
Over 55,000 cars that had full NCT tests this year, or 1 in 16 cars, were deemed unfit for use on a public road, meaning it's illegal to drive them.