Your Car Has 14 Explosive Charges Inside It. Ford Just Proved They Expire.

Sit down in your car tomorrow morning and, before you back out of the driveway, count the explosive devices within arm's reach: at least twelve, probably fourteen if your manufacturer was feeling generous with the safety spec sheet. Up to ten airbag modules are hiding behind the dash, the steering wheel, the headliner, the B-pillars, your door panels, and possibly your knees, each packed with propellant designed to ignite and inflate a nylon bag in roughly 30 milliseconds. Another two to four pyrotechnic charges sit inside the seat belt retractors, where pretensioner cartridges wait to yank the belt tight in the 15 milliseconds before an airbag fills your face. Every one of them is a controlled explosion waiting for the signal that you are about to die.

Ford just filed its third recall for the same defect in 2018–2022 Expedition and Navigator seat belt pretensioners, affecting 342,283 Expeditions and 77,684 Navigators whose retractor propellant is slowly eating itself alive.^[1] The mechanism is blunt: propellant inside the retractor degrades in high-heat environments, oxidation gnawing at internal components until the pretensioner fires on its own while you're sitting in traffic or pulling into a school parking lot, for no reason whatsoever. When it goes, the belt either locks rigid or retracts violently into your chest, and since the pretensioner is a one-shot pyrotechnic device, what you have afterward is not a functioning seat belt but an expensive sash. Ford knows of one injury globally and says the remedy won't arrive until August at the earliest.

If this sounds familiar, it should, because Takata's ammonium nitrate airbag propellant degraded the same way, catalyzed by the same enemies of heat, humidity, and time, and that failure killed 28 people in the United States and injured more than 400 before NHTSA recalled 67 million inflators across 19 manufacturers in the largest automotive recall in history.^[2] ARC Automotive's inflators are under a class-action lawsuit right now for the identical chemistry in 51 million more vehicles, with two deaths confirmed and a seven-year NHTSA investigation that has produced no resolution.^[3] Three manufacturers, three decades of vehicles, one failure mode: propellant absorbs moisture, develops microfractures, burns too fast or fires unbidden, and the industry treated Takata like a bad actor instead of what it actually was, which is the first public demonstration that the explosive chemistry inside every car on the road has an expiration date.

No federal regulation requires an expiration date on your airbag inflator or pretensioner, and no manufacturer volunteers one. Ammonium nitrate was the original propellant; guanidine nitrate replaced it in many applications after Takata's bankruptcy, though Ford's pretensioner recall doesn't specify the compound, only the mechanism: oxidation accelerated by heat, which is a delightfully vague way of saying "the bomb in your seat belt is decomposing because you live somewhere warm." Park your Expedition in Phoenix for four summers and the explosive charge in your seat belt retractor may decide it has had enough of waiting for a crash that never comes.

Meanwhile, FARS data shows the Expedition kills at 2.31 per 100 million vehicle miles traveled, already 50% deadlier than the Explorer and accumulating 1,515 fatalities between 2014 and 2023 at an average of 151 per year.^[4] That rate was calculated before 420,000 of them had seat belts that might lock or fire without warning, which is the kind of compounding variable that actuarial tables were not designed to contain and insurance underwriters would prefer not to think about.

The counterargument writes itself, and it is not wrong: one injury across 420,000 vehicles is a per-unit risk that rounds to zero, modern guanidine nitrate formulations are substantially more stable than Takata's ammonium nitrate, and the overwhelming majority of pyrotechnic devices in cars on the road will never malfunction during the vehicle's entire service life. These are fair points, and they are also beside the one that matters, because Takata was also a rounding error when NHTSA first opened an investigation, a handful of field reports out of tens of millions of inflators, and the agency spent years treating the data as statistical noise before 28 people were confirmed dead.

Count the bombs again: twelve to fourteen explosive devices per car, approximately 290 million registered vehicles in the United States, somewhere north of three billion pyrotechnic charges on American roads, every one of them subject to the same slow chemistry. Takata proved it in airbag inflators. ARC confirmed it in a different supplier's inflators. Ford just demonstrated it in pretensioners, a completely different device category with a completely different function and, apparently, the same fundamental vulnerability to the passage of time in a warm climate. The question was never if the propellant expires.

What You Can Do

If you own a 2018–2022 Ford Expedition or Lincoln Navigator, check your VIN at nhtsa.gov/recalls for recall 26S34 immediately, and if your airbag warning light has illuminated, stop driving the vehicle, because Ford's own documents indicate that light may precede inadvertent pretensioner deployment. For everyone else: check for open Takata recalls, because 17 million Takata inflators remained unrepaired as of NHTSA's most recent monitor report, and the older a defective inflator gets, the more dangerous it becomes.^[5] If you drive an older car in a hot climate, your odds of sitting on degraded propellant are not theoretical.