NHTSA recall 18V403000

What's wrong: These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the passenger frontal air bag, these inflators may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Why it matters: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.

The fix: Mazda will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. The recall began July 9, 2019.