The National Consumer Agency has secured its first conviction for car clocking.
On Friday John Joseph Reilly was convicted at Longford District Court for selling a car in which the mileage meter had been tampered with to reduce the reading.
Mr Reilly, of Reilly's Garage Abbeyshrule in County Longford, was fined €500.
The NCA says the decision to prosecute Mr Reilly was taken following an investigation of a complaint received from a consumer.
The NCA is now urging all car dealers to take all necessary steps to ensure that any cars which they purchase have not been clocked.