Faulty door latches have caused problems for Ford since 2015, when it recalled 692,000 small and midsize cars for similar issues. This week the Center for Auto Safety, a nonprofit group founded by Ralph Nader, called on Ford to recall more than a million Explorer SUVs to address an alleged risk of carbon-monoxide poisoning after the auto maker offered to repair vehicles to give "peace of mind" to customers. But Ford hasn't resorted to recalls and re-emphasized that its offer wasn't due to safety concerns. Ford shares were flat in morning trading.