Amid a growing scrutiny for fuel economy and emissions testing, Japan has found Mazda and two other companies cleared vehicles for fuel economy and emissions even though tests occurred in invalid conditions.

Mazda, Suzuki, and Yamaha each apologized for conducting invalid testing on their cars over the past few years, Reuters reported Thursday. The discrepancies came after the Japanese government ordered automakers to check their operations after Nissan admitted it issued false emissions and fuel economy data for 19 models in the country.

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In the case of Mazda, the company said it found irregularities in 4 percent of inspections, or about 70 cars. The errors during testing should have voided the test results, but retests didn't occur. Suzuki's cases stretched back to 2012 and 50 percent of the cars it inspected were done so improperly. Yamaha found 2 percent of its vehicles were subject to invalid results.

Mazda said in a statement that it did not intentionally cheat regulations, but acknowledged the errors made. The automaker also laid out a plan to ensure the problems do not reoccur, including more employees to check inspection data.

The automakers said they have not found problems with actual emissions of fuel economy performance in their cars and do not plan to conduct any recalls.

[Source: Reuters ]

A version of this story originally appeared on AutoGuide.com .