Half of all vehicles tested last year failed the NCT.
Data published by cartakeback.ie shows Cavan has the highest failure rate in the country at 61%.
This is followed by Athlone at 59% and Carrick-on-Shannon, where 58% of tests were failed.
Monaghan and Castlerea are also in the top 5, both holding a failure rate of 56% respectively.
Over 1 point 7 million NCTs were carried out last year - with the majority of failures for steering and suspension problems.
Speaking on the Joe Finnegan Show this morning, Dave Humphreys from completecar.ie explained that owners of newer cars are more likely to keep up with regular maintenance checks:
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