Federal regulators have persuaded Toyota, Chrysler and Honda to recall about 2.1 million vehicles because the airbags might deploy even when the vehicle is not in a crash, the National Highway Traffic Safety Administration announced on Saturday.
The vehicles were previously recalled for the problem in 2013 and 2014, but the fix did not work, Mark Rosekind, the N.H.T.S.A. administrator, said at a news conference in Washington.
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Owners will be notified by the automakers if their vehicles are covered by the recall.
