The U.S. government's road safety agency has closed a more than six-year investigation into exhaust odors in Ford Explorer passenger cabins, determining that the SUVs don't have high levels of carbon monoxide and don't need to be recalled.
The National Highway Traffic Safety Administration says it reviewed more than 6,500 consumer complaints, tested SUVs in the field and called in automotive, medical, environmental health and occupational safety experts before making the determination.
