A teen driver who died a few days after a July car crash near Pittsburgh has been tentatively identified by the government as the eighth death in the U.S. due to an explosive air bag inflator made by auto parts maker Takata, federal transportation officials said Wednesday.

Air Bag Recall
The Takata building, an automotive parts supplier in Auburn Hills, Michigan, is a major supplier of airbags to automakers. (AP Photo/Carlos Osorio)

The National Highway Traffic Safety Administration officials also announced an expansion in the recall of vehicles with Takata airbags, already the largest and most complex recall in the agency's history. The latest findings could result in the recall of several hundred thousand additional vehicles, officials said.

The appointment of an independent monitor to oversee the company's compliance with a government consent order on the recalls was also announced.

NHTSA learned of the latest death last week after a lawyer for the teen's family contacted the agency, NHTSA spokesman Gordon Trowbridge told reporters in a conference call. The car involved was a used 2001 Honda Accord under recall that was owned by a relative of the teen, he said. He didn't identify the victim or provide other details of crash.

"The agency has now tentatively concluded that this was likely a rupture-related fatality," Trowbridge said. The agency is now working the family and Honda to examine the vehicle in order to confirm that conclusion, he said.

There has also been a death outside the U.S., bringing the global total of fatalities to 9. Dozens of other people have been injured by the Takata inflators, which can explode with too much force, sending shrapnel into drivers and passengers.

In the U.S., about 23 million Takata air bag inflators have been recalled on 19 million vehicles sold by 12 auto and truck makers. Recent crash testing of vehicles already among those recalled resulted in five passenger side air bag inflator ruptures, Trowbridge said.

As a result, NHTSA is expanding the number of recalled vehicles to include other model years of the five vehicles involved in the tests as a safety precaution, he said. All the vehicles involved in the tests had spent substantial time in high humidity regions, he said.

Takata uses ammonium nitrate to create a small explosion that inflates the air bags in a crash. But the chemical can deteriorate under prolonged exposure to airborne moisture, causing it to burn too fast and blow apart a metal canister designed to contain the explosion.

While he didn't have a specific number for the vehicles being added to the recall, Trowbridge said it would likely amount to several hundred thousand vehicles.

"We have a great big problem here and it's going to take a long time to get it fixed," Trowbridge said.

Those vehicles are Mazda 6 model years 2005 to 2008, Honda CRV model years 2002 to 2004, Subaru Legacy model years 2005 to 2008 and Subaru Outback model years 2005 to 2008. The expanded Honda recalls alone involved 127,000 inflators in vehicles not previously recalled, the carmaker said.

Honda urged owners of the recalled cars to get their vehicles repaired at their local dealer as soon as possible. "Honda has sufficient replacement parts supplies to begin recall repairs of the added vehicles immediately, nationwide," the company said in a statement.

The good news, Trowbridge said, is that the pace of repairs of vehicles with faulty inflators has picked up significantly. As of Dec. 4, more than 27 percent of recalled driver's side airbag's and nearly 26 percent of recalled passenger side air bags had been repaired, he said.

NHTSA also announced the appointment of John Buretta, a former principal deputy assistant attorney general in the Justice Department's criminal division, to oversee Takata's compliance with an air bag recall compliance agreement with the government. Buretta is a partner of the law firm Cravath, Swaine & Moore.

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