(ABC) - Honda is now the fourth automaker to be drawn into an air bag defect investigation.
The case is evidence of how an issue involving a single supplier can spread throughout the industry.
The National Highway Traffic Safety Administration announced the investigation into airbags that can deploy for no reason. That investigation now includes 320,000 2003-2004 Honda Odyssey minivans.
Chrysler, Toyota and General Motors have already had to repair problems with their airbags in several models.