U.S. safety regulators have opened an investigation into air bags on Honda Motor Co’s 2008 Accord sedans after 19 complaints of air bags failing to deploy including in a front crash that resulted in an injury, federal officials said on Friday. The issue involves a module that controls deployment of the air bag. It appears to be a problem separate from that of combustible air bag inflators made by Takata Corp (7312.T) in Honda vehicles.