Suzuki Motor announced today that they have been using wrong fuel efficiency and emission testing methods on 16 models currently being sold in Japan, though proper tests showed there wouldn't be a need to amend the data.

According to Autonews, Suzuki's improper testing method dates back to 2010 and that around 2.1 million vehicles were effected, excluding Suzuki-badged models sold overseas.

"The company apologizes for the fact that we did not follow rules set by the country," stated CEO Osamu Suzuki, claiming that his workers did not use the improper data intentionally.

Given that the new readings didn't deviate much from the previously submitted ones, the Japanese automaker will continue selling its cars while adding that earnings have yet to be impacted by the mishap.

During tests, Suzuki measured data related to tires, brakes and transmissions, before combining the results with air resistance tests in a wind tunnel.

Of course, fuel economy compliance has been under the microscope ever since Mitsubishi came clean last month about overstating the ratings of four of their small models by as much as 10%.