While contemplating a possible Takata expansion, NHTSA has been doing detective work to find any other automakers using the supplier's inflators with ammonium nitrate propellant. That research has shown Volkswagen and Tesla were reportedly among the companies using those parts, and the agency sent letters in September to gather more data from Jaguar Land Rover, Mercedes-Benz, and several others.
The Takata recall might also grow because NHTSA believes that vehicle design can play a role in whether the inflators burst when the airbag deploys, Reuters reports. This is because high humidity is among the factors with a link to the explosions. A model with a cabin that lets in more moisture might therefore carry a higher risk of the fault.
The faulty Takata inflators have been blamed for eight deaths and at least 100 injures across the globe. At last count in early September, there were still 19.2 million vehicles with 23.4 million bad parts to be replaced in the US. Originally, nearly 34 million models were thought to need new components.