Jaguar has called on the Consumers' Association to produce evidence to support a damning survey finding on the “pricey” XJ saloon.
A Which? press release, with the heading 'New Jaguars leave a quarter of owners stranded,' was challenged by the manufacturer.
It is understood the survey reflected the findings of 46 owners though Which? topped its release by saying it assessed details from a total of 32,000 car owners.
According to Which?, the Jaguar XJ's reliability score of 76% meant that, on average, “an astonishing quarter of these cars left their owners stranded in the past year”.
A Jaguar spokesman said: “We have this year been awarded a gold medal by JD Power for the quality at the Browns Lane, Coventry, site where XJ is built.
“We are surprised the Which? findings conflict directly with the findings of JD Power.”
For years, carmakers have protested about Consumers' Association surveys because their headline statement has often attracted widespread consumer press coverage.
Which? says it rates cars on the number of times they have broken down and needed repairing over the last year.