The National Highway Traffic Safety Administration warned owners of nearly 84,000 older Nissan vehicles in the US equipped with unrepaired recalled Takata airbags to immediately stop driving them due to a safety hazard. The vehicles affected are the Nissan Sentra, Pathfinder, and Infiniti QX4 models that were recalled in 2020 but not yet fixed. Takata airbags can explode due to propellant that breaks down over time when exposed to temperature fluctuations and humidity, unleashing metal shrapnel inside vehicles. Over 100 million Takata air bag inflators have been recalled worldwide, including 7 million in the US, in the biggest auto safety recall ever.