Reports of engine problems involving some older Honda and Acura vehicles spur probe by the National Highway Traffic Safety Administration.

Honda’s November 2023 recall addressed 249,000 vehicles with crankshaft manufacturing defects that could cause total engine failure or even underhood fires. If this investigation leads to a recall, Honda could be looking at investigating over 1.4 million engines, and that’s just in the U.S.

The investigation covers 2018-2020 Acura TLX, 2016-2020 Acura MDX, 2016-2020 Honda Pilot, 2018-2020 Honda Odyssey, and 2017-2019 Honda Ridgeline vehicles.