More than one in 10 of all vehicles submitted for an NCT in Cavan last year were deemed dangerously defective.
Cavan had a "fail dangerous" rate of 11.4pc during 2025.
Other counties with high "fail dangerous" rates include Meath (9.4pc), Clare and Sligo (both 9.2pc) and Monaghan (9.0pc).
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Figures published by the National Car Testing Services show 7.6pc of more than 1.74 million vehicles tested at the country's 50 NCT centres last year were deemed unsafe.
Cars deemed "fail dangerous" will have a sticker stating their condition affixed to them by an NCT vehicle inspector. The NCT centre with the highest pass rate was in Deansgrange, Co Dublin, at 57.3pc. It was also the country's busiest centre with more than 111,000 vehicles tested last year.
