A Romanian worker checks a Ford Transit Connect car produced at the Ford factory in Craiova, 230km (143 miles) east of Bucharest September 8, 2009. [Agencies]

WASHINGTON: Ford Motor Co is expanding its largest ever recall -- involving faulty cruise control deactivation switches that have caused fires -- by 4.5 million vehicles, regulators and company officials said on Tuesday.

The action effectively closes out a 10-year saga over the switches made by Texas Instruments that has led to more than a half-dozen recalls at Ford covering 14 million registered vehicles, the automaker said in a letter to the National Highway Traffic Safety Administration (NHTSA).

Texas Instruments no longer provides the switches for Ford vehicles.

The government added to the Ford total two million vehicles, factoring in models not believed to be on the road.

"While the data show the majority of the vehicles being recalled do not pose a significant safety risk, we are recalling the vehicles to reassure consumers and eliminate any future concerns," Ford said in a statement.

Ford did not provide information on how much the latest recall would cost the company.

It was the second major recall in as many weeks for the auto industry. On September 30, Toyota Motor Corp said it would recall approximately 3.8 million vehicles in the United States because of floor mats that can come loose and force down the accelerator.

The problem at Toyota is suspected in crashes that have killed five people.

Ford and Toyota have been two of the stronger performers during the industry's severe sales slump, although their US businesses remain off compared to last year.

US and foreign automakers are emphasizing quality more than ever as consumers seek economy and reliability with fuel prices high and recession and tight credit eroding the pool of potential buyers.

NHTSA on Tuesday alerted owners of more than a half-dozen truck and van models sold in the United States and US territories of potential fire hazards linked to flawed switches in Ford vehicles.

In a warning to consumers, government safety officials investigating the switches said leaking fluid can overheat and potentially cause fires even when the ignition is off. There have been fires reported over the years and some minor injuries, Ford said.

"I urge consumers to pay attention to this warning and bring the affected models in to have them repaired as soon as possible," Transportation Secretary Ray LaHood said in a statement.