A lawsuit brought by customers alleges Ford rigged certain Super Duty diesel utes to cheat on emissions tests.
The suit accuses Ford and German electronics firm Bosch of "knowingly installing emissions-cheating software devices in 2011-2017 Ford 250 and 350 Super Duty diesel pickup trucks," according to a statement from lawyers Hagens Berman, the company behind the suit.
Reuters has reported that Ford manipulated the emissions system in violation of federal requirements and the affected trucks released twice the legal limits of emissions during normal driving, the lawsuit claims.
An emission-cheating scandal that came to light in 2015 cost Volkswagen tens of billions of dollars in settlements and fines.
Ford said in a statement that all of its vehicles comply with all U.S. Environmental Protection Agency and California Air Resources Board emissions regulations.
“Ford vehicles do not have defeat devices,” the company said. “We will defend ourselves against these baseless claims.”
Hagens Berman, has launched lawsuits in the last year against General Motors and Fiat Chrysler as well as engine maker Cummins, making similar allegations.
In the tests Ford conducted on the F-250 and F-350 vehicles, “emissions are routinely as high as five times the standard,” the lawsuit said, adding that the trucks should bear the moniker “Super Dirty”.
Hagens Berman managing partner Steve Berman said in a statement to CNNMoney that Ford deceived customers while also marketing the vehicles as low polluting.
"Ford's advertising of these Super Duty pickups is littered with over-the-top promotion of fuel economy and so-called 'cleanest ever' power," Berman said. "Ford not only cheated emissions in these trucks, but cheated consumers as well, playing up promises it couldn't keep."
The Ford F-Series is the biggest-selling vehicle in the United States and has been since 1981.