The U.S. government’s Highway Safety Agency is investigating complaints that engines may be failing in as many as 1.4 million Honda and Acura vehicles.

The National Highway Traffic Safety Administration’s investigation covers the 2016 through 2020 Honda Pilot and Acura MDX, as well as the 2018 through 2020 Honda Odyssey and Acura TLX. Also included is the 2017 through 2019 Honda Ridgeline.

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Connecting rod bearings in vehicles equipped with 3.5-liter V6 engines can fail, leading to complete engine failure, the agency says in documents posted on its website Monday. Connecting rods connect the pistons to the crankshaft and convert the vertical motion to move the wheels.

Honda recalled about 250,000 cars in November 2023 to fix the same problem. But the agency says it has 173 complaints from owners who reported failing connecting rod bearings, yet their vehicles were not included in the recall. One owner reported an accident with no injuries.

The agency said it is opening a recall inquiry to determine the severity of the problem in vehicles not included in the 2023 recall.

Honda said it will cooperate with NHTSA in the investigation.

In documents explaining the 2023 recall, the automaker said it had 1,450 warranty claims due to the bearing issue but no injuries reported. Dealers had to inspect and repair or replace engines if necessary.