WASHINGTON — BMW AG said Wednesday it was recalling 200,000 vehicles over concerns that the front passenger air bag may not deploy in a crash.

The German automaker said the recall involves the 2006 3 Series, the 2004-06 5 Series and the 2004-06 X3 compact sport utility vehicles in the United States.

The National Highway Traffic Safety Administration said in a posting on its Web site that small cracks could develop in a seat detection mat and deactivate the front passenger air bags.

NHTSA said the air bag warning lamp and the passenger air bag "on-off" light would remain on. The head protection system, however, would not be affected, the government said.

BMW spokesman Tom Plucinsky said there were no injuries or accidents reported.

If the seat detection mat fails to sense that a person is sitting in the passenger seat, it deactivates the air bag. Plucinsky said customers alerted the company when they noticed that the air bag light indicated a deactivated air bag even when a passenger sat in the seat.

NHTSA opened an investigation into the issue in September 2007 and upgraded its probe in January.

BMW said under an extended warranty program, the detection mat in a vehicle with the air bag system problems would be replaced at no charge to the customer.

Owners can contact BMW at 800-525-7417.

On the Net:

BMW of North America: www.bmwusa.com