Volkswagen was in hot water for the same earlier this year.
The Justice Department filed suit against Fiat-Chrysler, alleging they used special software to get around the tests.
Fiat-Chrysler denies wrongdoing.
Volkswagen was in hot water for the same earlier this year.
The Justice Department filed suit against Fiat-Chrysler, alleging they used special software to get around the tests.
Fiat-Chrysler denies wrongdoing.