2009 Toyota Camry - blue - front three-quarter view

The National Highway Traffic Safety Administration has grown its investigation into certain Toyota models to cover a full 1.4 million cars and trucks. Reuters reports the government safety agency has upgraded the investigation to a full-blown engineering analysis, which may eventually lead to a recall. NHTSA has received a number of complaints concerning fires tied to models built between September 2006 and August 2008 that use the same power window master switch design. All told, customers have reported nine injuries and 161 crashes or fires, though no deaths have been tied to the issue.

The analysis covers 2007-2009 Camry, Camry Hybrid, RAV4 and Yaris models as well as 2008 Highlander Hybrid crossover. Back in February, NHTSA opened an investigation into 830,000 Camry and RAV4 units, though today's announcement grows that number to over 1.4 million models.