Germany’s BMW Group is analyzing a limited number of its cars in Hawaii, Puerto Rico and the Virgin Islands, it said on Monday, as part of a broader investigation into the safety of air bags supplied by Japan’s Takata Corp.

BMW is examining the cars at the request of the U.S.-based National Highway Traffic Safety Administration (NHTSA), which is determining whether Takata airbag inflators made after 2002 are prone to failure in areas of high humidity.

Japanese carmakers including Honda  and Nissan  on Monday recalled 2.9 million vehicles globally over fears their Takata air bags were at risk of exploding and shooting shrapnel at passengers and drivers.

A spokesman for BMW said Takata air bags had been installed in BMW vehicles of the E46 3-series generation built between June 2000 and August 2006. These are similar, but not identical, to the airbags identified as being potentially problematic by other manufacturers.

“It is not a safety recall, it is a special technical campaign,” the spokesman said, adding there were no known safety incidents involving Takata air bags in BMW cars.

In a June 11 letter to the NHTSA, Takata said it would support “regional campaigns” to replace certain driver-side air bag inflators made between January 2004 and June 2007, as well as certain passenger-side inflators made between June 2000 and July 2004.

Takata said it believed these inflators were supplied to BMW, Chrysler, Ford, Honda, Mazda, Nissan and Toyota for vehicles sold in the United States.

Takata said it would support the replacement of those inflators in vehicles in high humidity areas of Puerto Rico, Florida, Hawaii and the Virgin Islands.

In order to work, air bags need to inflate in less than half the time it takes to blink an eye. That requires the use of powerful and potentially dangerous explosives in inflators which require careful handling and precise calibration.

Reporting by Edward Taylor