Just days after announcing a civil fine against Ford for moving too slowly on a recall, the U.S. government unveiled two investigations into recalls that may not have worked or covered enough vehicles.

A U.S. government auto safety regulator has opened two separate investigations into Ford vehicles over concerns that prior safety recalls may not have been extensive enough. The National Highway Traffic Safety Administration (NHTSA) announced both probes, which collectively affect more than 500,000 Ford trucks and SUVs, on Nov. 15.

Regulators are looking into whether Ford should recall 112,000 Ford Expedition SUVs over seat belt issues and whether Ford's recall of 456,000 SUVs over a loss of power and an electrical system failure is adequate.

The National Highway Traffic Safety Administration said on Monday it has opened two new investigations into Ford recalls, the latest scrutiny by U.S. regulators of the No. 2 U.S. automaker. Last week,

NHTSA unveils two investigations into recalls that may not have worked, just days after announcing civil fine against Ford for moving too slowly.

The new investigations by The National Highway Traffic Safety Administration (NHTSA) focus on two separate recall actions taken by Ford earlier this year. The first investigation examines whether the company should expand its February recall of 77,