DETROIT — The largest recall in Toyota's 75-year history is threatening to undermine the carmaker's comeback from natural disasters and embarrassing safety problems.
The company on Wednesday recalled 7.43 million cars, trucks and SUVs worldwide to fix faulty power window switches that can cause fires. The recall affects more than a dozen models produced from 2005 through 2010 around the world including the Camry, the top-selling car in the U.S. It's bigger than the 7 million vehicles recalled two years ago for floor mats that can trap accelerator pedals and cause unintended acceleration.
The problem centers on the power window switch, which is inside the driver's door and controls when a window is opened or closed. Toyota said grease wasn't applied evenly to the switch during production, causing friction and sometimes smoke and fire.
The flaw raises questions about whether Toyota Motor Corp. has solved quality and safety issues that embarrassed the company in 2009 and 2010. It also could jeopardize Toyota's impressive rebound from last year's earthquake and tsunami in Japan that hobbled factories and left dealers short of models to sell.
Toyota officials initially said the window problem hasn't caused any crashes or injuries. But documents filed by U.S. safety regulators show customers have reported 161 fires and nine injuries, but no deaths.
The U.S. National Highway Traffic Safety Administration began looking into window problems with two Toyota models in February after noticing a higher than normal number of complaints. Most fires caused by the window switch were minor, although a Camry was destroyed in one case. Several owners reported that they were afraid to drive their vehicles because of the threat of fires.
Toyota said Wednesday that it has received more than 200 complaints about the switches in the U.S., and more from other countries, including 39 in Japan. Most of the complaints were about a sticky feel to the switches while pushing the button to move the window up or down, but there also were reports of the smell of smoke, company spokesman John Hanson said.
Toyota dealers will inspect the switches and apply a special grease to them. In some cases the switches and circuit boards could be replaced, Mr. Hanson said. The recall includes 2.5 million vehicles in the U.S., where it covers about half the models sold under the Toyota and Scion brands.
Mr. Hanson said he was not sure if the recall will hurt Toyota's sales, which have come roaring back in the U.S. after production recovered from the earthquake.
Through September, sales were up nearly 32 percent compared with a year earlier, more than double the growth of the U.S. industry. Toyota also reclaimed the title of the world's top-selling automaker during the first half of this year, wresting the crown from General Motors Co. Toyota sold 4.97 million vehicles globally in the first half, beating GM by about 300,000.
The window switch recall also highlights one of the risks of globalized car production: Automakers install the same parts on multiple models in different countries, saving money but exposing their lineups to big recalls if a part proves flawed.
Toyota said it quickly identified all the models using the problem switches and took action.
"We want to make sure that we addressed this issue quickly and effectively, and I think we are doing that with this recall," Mr. Hanson said.
Before the safety recalls two years ago, Toyota had a global reputation for near-flawless quality, centered around its super-lean production methods that empowered workers to hone in on quality control. Toyota executives have acknowledged the escalating recalls were partly caused by the company's overly ambitious growth goals.
• Yuri Kageyama reported from Tokyo.