Takata is the only major airbag maker that uses the compound in its driver and passenger-side airbags. It has been barred by auto safety regulators from entering into any new contracts for airbags that use ammonium nitrate without a drying agent.

Still, automakers remain free to equip model years already in production with the defective Takata airbags, including a version of the airbag that does not contain a drying agent.

Those cars would need to be recalled by 2018 under a schedule laid out in a consent order issued by federal auto safety regulators. Until then, however, automakers are not required to disclose that the cars carry the Takata airbags, leaving new owners unaware that their car has already been marked for recall down the road.

Toyota and Fiat Chrysler have refused to name the new models that contained the riskier airbags. Toyota told the committee that it expected to produce about 175,000 cars for the United States with the riskier Takata airbags through July 2017. Fiat Chrysler said one of its current models contained a passenger-side airbag with the riskier Takata airbag model.

Volkswagen said that its 2016 Volkswagen CC, and its Audi brand’s 2016 Audi TT and 2017 Audi R8 models contained the riskier Takata airbags. Mitsubishi said that the 2016 and 2017 model years of its i-MiEV electric vehicle contained the riskier airbags.

Victor Vanov, a Toyota spokesman, emphasized that the automaker was phasing out its use of Takata airbag inflaters without the drying agent, and that the cars had not yet been recalled.

Alex Fedorak, a Mitsubishi spokesman, said that owners of the new cars would be contacted in the first quarter of 2017 to have their airbags replaced to a non-Takata inflater. Jeannine Ginivan, a spokeswoman for Volkswagen, did not provide a response.