1.3 million Ford Explorers are under investigation for poisoning drivers

The National Highway Traffic Safety Administration has upgraded a probe into potential carbon monoxide poisoning being caused by Ford Explorers. The NHTSA said it is aware of 2,700 complaints and three crashes potentially linked to carbon monoxide poisoning in the vehicles' cabin. An initial investigation was opened last year into more than 638,000 vehicles, and the NHTSA has now upgraded that investigation into an "engineering analysis," a necessary step before the agency can force Ford to reca...