The vehicles were already subject to open Takata airbag recalls from 2020. A vehicle's frontal passenger airbag inflators may explode due to "propellant degradation occurring after long-term exposure to high absolute humidity, high temperatures, and high temperature cycling," according to the recall notices from the National Highway Traffic Safety Administration (NHTSA). "Due to the age of the vehicles equipped with defective Takata airbag inflators, there is an increased risk the inflator could explode during an airbag deployment, propelling sharp metal fragments which can cause serious injury or death," Nissan said on its website.