DescriptionA major development resulting from an ongoing CBS News investigation could affect more than one million Ford Explorer owners. The National Highway Traffic Safety Administration says the number of complaints and injuries related to possible carbon monoxide leaks is much higher than previously thought. Kris Van Cleave reports.Subscribe to the "CBS This Morning" Channel HERE: http://bit.ly/1Q0v2hE Watch "CBS This Morning" HERE: http://bit.ly/1T88yAR Watch the latest installment of "Note to Self," only on "CBS This Morning," HERE: http://cbsn.ws/1Sh8XlB Follow "CBS This Morning" on Instagram HERE: http://bit.ly/1Q7NGnY Like "CBS This Morning" on Facebook HERE: http://on.fb.me/1LhtdvI Follow "CBS This Morning" on Twitter HERE: http://bit.ly/1Xj5W3p Follow "CBS This Morning" on Google+ HERE: http://bit.ly/1SIM4I8 Get the latest news and best in original reporting from CBS News delivered to your inbox. Subscribe to newsletters HERE: http://cbsn.ws/1RqHw7T Get your news on the go! Download CBS News mobile apps HERE: http://cbsn.ws/1Xb1WC8 Get new episodes of shows you love across devices the next day, stream local news live, and watch full seasons of CBS fan favorites anytime, anywhere with CBS All Access. Try it free! http://bit.ly/1OQA29B ---Delivered by Charlie Rose, Norah O’Donnell and Gayle King, "CBS This Morning" offers a thoughtful, substantive and insightful source of news and information to a daily audience of 3 million viewers. The Emmy Award-winning broadcast presents a mix of daily news, coverage of developing stories of national and global significance, and interviews with leading figures in politics, business and entertainment. Check local listings for "CBS This Morning" broadcast times.