The investigation is looking at vehicles that may have a “failure of connecting rod bearings leading to complete engine failure."

NHTSA is launching an investigation into 1.4 million Honda vehicles and oversights during the automakers' previous recalls.

The National Highway Traffic Safety Administration (NHTSA) has opened a formal investigation into more than 1.4 million Honda and Acura vehicles due to a potential engine defect involving connecting rod bearings. The investigation, which follows a previous recall, will examine if additional vehicles need to be recalled.

A 2023 recall may not have included as many vehicles as it should have.

The National Highway Traffic Safety Administration has concerns about several models from different years, including the Honda Pilot and Acura MDX, the Honda Odyssey and Acura TLX, and Honda Ridgeline.

The National Highway Traffic Safety Administration has initiated an investigation into over 1 million Honda and Acura vehicles. The agency has received numerous complaints of engine failure due to faulty connecting rod bearings in certain vehicles.