U.S. officials announced a $1.6 billion deal with Toyota's Hino Motors unit to settle charges it deceived regulators about the amount of emissions spewed by its diesel engines.

Toyota’s heavy-duty trucking unit was fined $1.6 billion on Wednesday over fraudulent emissions testing and other violations.

Hino Motors, a Toyota subsidiary, will plead guilty to conspiracy charges and pay penalties for deceiving regulators about its diesel engines, the E.P.A. said.