Toyota adds 1.6 million vehicles to Takata air bag recall

Toyota is adding nearly 1.6 million more cars to its recall of vehicles with Takata air bags, it announced Monday.

The recall involves front passenger air bags on vehicles as much as a decade old. The recall comes after Takata disclosed that the propellant that inflates the air bags in a crash can degrade, causing the inflator to rupture as the bags deploy. If it does, it can spew metal and plastic fragments like those blamed for the deaths of 11 motorists.

The problems are more likely to occur in regions with high humidity and high temperatures.

Toyota isn't alone. The Takata recall has touched more than 10 automakers in the U.S.

The new vehicles added to the recall include the 2006 to 2011 Yaris and Lexus IS; 2010 and 2011 4Runner and Lexus GX; 2011 Sienna; 2008 to 2011 Scion xB; and 2007 to 2011 Lexus ES.

Toyota says it will notify owners of the vehicles of the recall by mail.