Just a few days after the announcement of a civil fine against Ford for moving too slowly on a recall, the US government has revealed two investigations into recalls that may not have worked or covered enough vehicles.

The largest of the probes covers about 457,000 Ford Bronco Sport SUVs and Maverick small pickups. In April Ford recalled certain 2021 through 2024 Bronco Sports and 2022 through 2023 Mavericks have been recalled because they may suddenly lose power.

There were five complaints from owners whose vehicles lost power after receiving the recall fix, the National Highway Traffic Safety Administration said in a document posted Monday. The agency will investigate whether the recall was effective. The loss of power was attributed to degraded 12 volt batteries.

The other probe covers about 113,000 Ford shipments from 2019 to 2020. Ford recalled about 78,000 SUVs in February because the driver and front passenger seat belts can buckle and restrain people without an accident being seen.

The agency says it has complaints about the problem from three owners whose vehicles were not part of the recall. Investigators will check to see if the recall should be expanded.

Ford said it is cooperating with both investigations.

On Thursday, NHTSA announced that Ford Motor Co. will pay a penalty of up to $165 million for moving too slowly on a recall and for failing to provide the agency with accurate recall information.

The agency said the civil penalty is the second largest in its 54-year history. Only the fine Takata paid for the defective airbag inflators was higher.

NHTSA said Ford was too slow to recall vehicles with defective rearview cameras and did not provide the agency with complete information, which is required by the federal Motor Vehicle Safety Act.