Several manufacturers in Japan have been found to have improperly tested cars for emissions and fuel economy in an investigation ordered by the Japanese government after the discovery of Nissan and Subaru"s emissions testing impropriety last year.
Suzuki, Mazda and Yamaha are implicated, although with different levels of severity.
Mazda released a statement explaining that “Test data containing speed trace errors was found in 72 cases out of 1472 vehicles tested under the JC08 mode.”
The company’s emissions testing system “was not set up to automatically invalidate results when a speed trace error occurred,” it explained, while the level of deviation permitted under the test was at the discretion of each individual inspector.
As a result, there is no false data in any of Mazda’s test data from either test mode. The company has dealt with the findings by updating its testing system to invalidate test results if a speed trace error is detected, as well as increasing the number of workers checking the data.