U.S. auto investigators expanded the Ford engine failure investigation to include new models, which are almost 709,000 vehicles.
The National Highway Traffic Safety Administration (NHTSA) has upgraded its investigation to engineering analysis.
It now covers Ford's F-150 pickup truck, Explorer, Bronco and Edge SUVs, and Lincoln Nautilus and Aviator SUVs from 2021 and 2022.
According to the agency, the 2.7-liter or 3.0-liter V6 turbocharged engines can lose power due to engine failures related to faulty valves.
Ford has got around 861 customer complaints, warranty claims, and engine replacements from other models as well. There were no crash or injury reports.
According to Ford, the intake valves usually fail in the vehicle's initial years, so most have already happened.
The NHTSA is also probing into some Ford SUVs that are rolling away unexpectedly even while parked.
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In all, Ford is undergoing three separate investigations including rear axle mounting bolt fractures in 2020-2022 Explorers.