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U.S. car owners whose air bags have been replaced in the past three years may have had dangerous counterfeit聽bags installed, the Obama administration warned Wednesday.

Government investigators believe many of the bags come from China, an industry official said.

Only 0.1 percent of the U.S. vehicle fleet 鈥� about 250,000 cars on the road 鈥� are makes and models for which聽counterfeit聽airbags are known to be available, the National Highway Traffic Safety Administration said in a statement. Industry officials briefed by the government said tens of thousands of car owners may be driving vehicles with聽counterfeit聽air bags.

In government tests last month of 11聽counterfeit聽bags, 10 didn't inflate or failed to inflate properly. In one test, a聽counterfeit聽bag shot flames and shards of metal shrapnel at a crash dummy instead of inflating, said NHTSA Administrator David Strickland, who showed a video of the test at a news conference.

"It is an extreme safety risk," he said.

NHTSA is asking car owners to check a government website, www.Safercar.gov, for information on how to contact a call center established by auto manufacturers to learn if their vehicle model is among those for which聽counterfeit聽air bags are known to have been made.

No deaths or injuries have been tied to the聽counterfeit聽bags, NHTSA said. But it's unclear whether police accident investigators would be able to identify a聽counterfeit聽bag from a genuine one, industry officials said.

NHTSA has compiled a list of dozens of vehicle makes and models for which聽counterfeit聽air bags may be available, but the agency cautioned that the full scope of the problem isn't clear yet and the list is expected to "evolve over time."

If a car is on the list and has had its air bags replaced during the past three years by a repair shop other than a new car dealership, NHTSA is asking owners to take the vehicle into a dealership to be inspected at their own expense to determine whether the replaced air bags are聽counterfeit. Fees for checking out air bags could run $100 or more, industry officials said. Some types of cars have as many as eight air bags.

NHTSA officials stressed that the problem isn't the result of a manufacturing defect by automakers and isn't a recall.

The聽counterfeit聽bags typically have been made to look like air bags made by automakers and usually include a manufacturer's logo.

The bags are marketed to auto repair and body shops as the real deal, industry officials said. Auto dealerships that operate their own body shops are usually required by their franchise agreements to buy their parts, including air bags, directly from automakers and therefore are unlikely to have installed聽counterfeit聽bags, industry officials said.

But only 37 percent of auto dealers have their own body shops, according to information on the National Association of Automobile Dealers' website. Many consumers whose vehicles have been damaged are referred by their insurance companies to auto body shops that aren't affiliated with an automaker.

Consumers who bought replacement air bags online or who have purchased a used car that may have its聽airbags聽replaced in the past three years were also asked to check NHTSA's list.

Counterfeiting聽of a wide variety of auto parts has long been a well-known problem, industry officials said. But recent incidents have escalated concern by government officials. In August, federal agents confiscated nearly 1,600聽counterfeit聽air bags and arrested a North Carolina auto mechanic, according to a report by the Charlotte Observer. The mechanic was tied by federal officials to another聽counterfeit聽air bag case last year in Tennessee, the report said.

Last February, Dai Zhensong, a Chinese citizen, pleaded guilty and was sentenced in federal court in Chattanooga, Tennessee, to 37 months in prison for trafficking in聽counterfeit聽air bags, according to a statement made at the time by the U.S. Attorney's Office.

Zhensong was a part owner and manager of the international department of Guangzhou Auto Parts, which made a variety of auto parts, many of which were聽counterfeit, the statement said. In 2010, he traveled from China to Chattanooga to sell additionalcounterfeit聽air bags and other auto parts.

The聽counterfeit聽air bags were manufactured by purchasing genuine auto air bags that were torn down and used to make molds to produce the聽counterfeit聽bags. Trademark emblems were purchased through Honda, Toyota, Audi, BMW and other dealerships located in China and affixed to the聽counterfeit聽air bags. The air bags were advertised on the Guangzhou Auto Parts website and sold for approximately $50 to $70 each, far below the value of an authentic air bag, the statement said.

About 2,500聽counterfeit聽airbags聽have been seized by law enforcement authorities so far this year and investigations are in progress in several locations around the country, John Morton, director of U.S. Immigration and Customs Enforcement, told reporters.