MOT failure figures released by the Department for Transport earlier this year contained numerous errors, the organisation has admitted.
Contacted by Autocar after analysis showed that some of the percentage failure rates didn't tally with the published number of MOT tests and failures for some car models, a DfT spokesman admitted, "There are quite a lot of anomalies in the figures.
"These are the result, chiefly, of human error," said a spokesman. "We relied on MOT garages inputting the data manually into the system, and it's clear when you look through that not all the figures are correct."
The errors include figures for several Renault models, which came in for particular criticism following a report on the figures by the BBC.
Now the DfT has vowed to check its figures more carefully, and publish them regularly to provide consumers with reliable information.
"We plan to release the information more regularly, and in a format people will understand," said the spokesman.