U.S. safety regulators step up probe into Hyundai, Kia engine fires U.S. safety regulators step up probe into Hyundai, Kia engine fires December 27, 2021 dzadmin Comments 0 Comment NHTSA’s probe is looking into engine fires in some Hyundais and Kias and said its engineering analysis covers about 3 million vehicles to evaluate, among other things, the efficacy of recalls initiated by the two automakers.