Japanese automakers Honda and Nissan have added to the growing list of vehicles that could contain a potentially fatal air bag component. So far 7.8 million U.S. vehicles from 10 major auto manufacturers contain the flawed component made by Japanese auto safety parts-maker Takata Corp., which could cause bags to overinflate, explode and spray bits of metal into the cabin.

Honda, which has the highest number of affected vehicles, added its 2006 Ridgeline pickup truck to its list. Nissan expanded its list to include the 2006 Sentra and 2006 M luxury sedans. Both notices were announced Saturday on the National Highway Traffic Safety Administration website.

The scope of the recalls underscores how numerous manufacturers can rely on a single part supplier, in this case Takata. When a flaw is discovered like this, the impact is broad.

Air bag inflator An air bag inflation canister like the one in 7.8 million cars that can cause the bag to over-inflate, explode and spray metal fragments into the people it's supposed to protect. Photo: NHTSA Filing

Takata’s share price hit a five year low Monday in Tokyo when the stock plummeted nearly 17 percent to 1,177 yen ($10.31). On Friday, the New York Times cited two former Takata employees who claim the company in 2004 ordered technicians to destroy test results showing air bag inflators contained cracks. Honda and Nissan say the latest recalls affect vehicles “originally sold or ever registered in geographic locations that consistently experience high absolute humidity” -- i.e. much of the U.S.

Takata has said a flawed air bag inflator contains contaminated propellant that causes catastrophic overinflation if the car is exposed to long periods of heat and humidity.

The Center for Auto Safety, a Washington consumer advocacy organization, has criticized NHTSA for permitting these region-based recalls, saying they risk owners of affected vehicles forgoing repairs if they live outside of the areas mentioned in the recall notices.

The U.S. states and territories mentioned in Honda’s and Nissan’s latest announcements are Alabama, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, U.S. Virgin Islands, Saipan, Guam and American Samoa.

With the addition of new vehicles, Honda now has more than 5 million of the Takata air bag-related recalls. Nissan’s number stands at nearly 695,000 vehicles.

For further information, vehicle owners can go to the manufacturers; consumer website or NHTSA’s Vehicle-Identification-Number-lookup tool. The NHTSA currently (as of Nov. 10, 2014) lists the following vehicles that contain the faulty Takata air bags.

Honda: 5,051,364 potentially affected vehicles

2001 – 2007 Honda Accord

2001 – 2002 Honda Accord

2001 – 2005 Honda Civic

2002 – 2006 Honda CR-V

2003 – 2011 Honda Element

2002 – 2004 Honda Odyssey

2003 – 2007 Honda Pilot

2006 – Honda Ridgeline

2003 – 2006 Acura MDX

2002 – 2003 Acura TL/CL

2005 – Acura RL

Toyota: 877,000 potentially affected vehicles

2002 – 2005 Lexus SC

2002 – 2005 Toyota Corolla

2003 – 2005 Toyota Corolla Matrix

2002 – 2005 Toyota Sequoia

2003 – 2005 Toyota Tundra

Nissan: 694,626 potentially affected vehicles

2001 – 2003 Nissan Maxima

2001 – 2004 Nissan Pathfinder

2002 – 2004 Nissan Sentra

2001 – 2004 Infiniti I30/I35

2002 – 2003 Infiniti QX4

2003 – 2005 Infiniti FX35/FX45

BMW: 627,615 potentially affected vehicles

2000 – 2005 3 Series Sedan

2000 – 2006 3 Series Coupe

2000 – 2005 3 Series Sports Wagon

2000 – 2006 3 Series Convertible

2001 – 2006 M3 Coupe

2001 – 2006 M3 Convertible

Chrysler: 371,309 potentially affected vehicles

2003 – 2008 Dodge Ram 1500

2005 – 2008 Dodge Ram 2500

2006 – 2008 Dodge Ram 3500

2006 – 2008 Dodge Ram 4500

2008 – Dodge Ram 5500

2005 – 2008 Dodge Durango

2005 – 2008 Dodge Dakota

2005 – 2008 Chrysler 300

2007 – 2008 Chrysler Aspen

Mazda: 64,872 potentially affected vehicles

2003 – 2007 Mazda6

2006 – 2007 MazdaSpeed6

2004 – 2008 Mazda RX-8

2004 – 2005 MPV

2004 – B-Series Truck

Ford: 58,669 potentially affected vehicles

2004 – Ranger

2005 – 2006 GT

2005 – 2007 Mustang

Subaru: 17,516 potentially affected vehicles

2003 – 2005 Baja

2003 – 2005 Legacy

2003 – 2005 Outback

2004 – 2005 Impreza

Mitsubishi: 11,985 potentially affected vehicles

2004 – 2005 Lancer

2006 – 2007 Raider

General Motors: undetermined number of potentially affected vehicles

2003 – 2005 Pontiac Vibe

2005 – Saab 9-2X