The U.S. Environmental Protection Agency is near reversing an Obama administration decision to lock in future stringent vehicle fuel-economy and emission standards after auto makers lobbied the agency’s new chief to reopen a review of the regulations, said people familiar with the matter.

The EPA is preparing to as soon as the coming week undo a “final determination” the agency made in January to keep the future mileage and emissions targets intact, though the timing could slip, the people said. The decision would reopen a review of whether the standards intended to cut tailpipe emissions should be relaxed, toughened or left unchanged. The standards would remain in place in the meantime.