The US Federal government and California state authorities brought the charges against Hino and its US subsidiaries after the company voluntarily disclosed it had used falsified emissions test data to get approval to import and sell more than 110,000 diesel engines in the US, most of which were installed in heavy-duty trucks made by Hino.

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 Motor unit Hino Motors has agreed to a $1.6 billion settlement with US agencies and will plead guilty over excess diesel engine emissions in more than 105,000 US vehicles, the company and US government said on Wednesday.