point in 2017 the austin texas police department took 400 explorer police vehicles out of service over concerns of carbon monoxide in the cabins but the department put them back on patrol after ford made repairs to exhaust tips and lift gates and fixed other issues nhtsa also said it investigated cracked exhaust manifolds and tested the service campaign repairs to make sure they didnt affect cabin fume levels the nonprofit center for auto safety in washington in 2018 had called on ford to recall all of the explorers due to the high number of complaints on monday executive director michael brooks said it appears that fords service campaign took care of the problem but he questioned why it took nhtsa so long to examine the issue and make a decision he also said that nhtsa should seek recalls of all explorers with crash damage to make sure the bodies are sealed