The National Highway Traffic Safety Administration says it has new data showing that chances are as high as 50 percent that the inflators can explode in a crash.
Transportation Secretary Anthony Foxx says the vehicles should be fixed as soon as possible before they cause more deaths or injuries.
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Takata inflators can explode with too much force, blowing apart a metal canister and sending shrapnel into drivers and passengers. At least 11 people have died and more than 100 have been injured.
The advisory covers vehicles from the 2001 to 2003 model years.
The higher-risk inflators are in the following Honda and Acura vehicles:
* 2001-2002 Honda Civic
* 2001-2002 Honda Accord
* 2002-2003 Acura TL
* 2002 Honda CR-V
* 2002 Honda Odyssey
* 2003 Acura CL
* 2003 Honda Pilot