U.S. auto safety regulators are investigating complaints that engines can fail on as many as 1.4 million Honda and Acura vehicles.

The National Highway Traffic Safety Administration has opened an investigation into 1.4 million Honda and Acura vehicles that may have a serious engine def

The National Highway Traffic Safety Administration said Monday it is opening a probe into 1.4 million Honda vehicles after reports of serious engine issues. Honda in November 2023 recalled 249,000 vehicles in the United States with a 3.

Honda recalled about 250,000 vehicles for the same problem, but regulators say they've had complaints about vehicles not included in the recall.