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An investigation was opened by Safety officials at the National Highway Traffic Safety Administration (NHTSA) to inspect a potential exposure to carbon monoxide in Ford Motor Co.’s recent model mainly Explorer SUVs, according to reports.

The Explorer SUVs model 2011 to 2015 investigation was opened last Friday by NHTSA and found 154 complaints of “occupants smelling exhaust odors in the occupant compartment,” some of the vehicle owners have also “expressed concerns about exposure to carbon monoxide.”

A spokeswoman at Ford said, “We will cooperate with NHTSA on this investigation as we always do.”

An investigation is often held if there is a need for a recall of the cars involved, citing that a certain investigation could lead to a recall but does not always happen.

According to NHSA, there were reports that there’s a vehicle crashed relative to the potential hazard, and no injuries.

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The NHTSA and Ford Motor Co. refrained from giving comments on how many cars are being investigated. Over 950,000 explorers model 2011 to 2015 were sold by the company, according to Autodata.

Subsequently, Federal officials declined to comment on how many Explorer SUVs would be covered under the investigation.

The problem was also noticed by Explorer owners and told NHTSA an exhaust gas is circulating when the SUVs were in full throttle such as climbing steep roads or merging into ramps. Some said that the air-conditioning system recirculates into the cabin.

Last December 2012 and July 2014, Ford has issued two “technical service bulletins,” which have triggered repair shops of dealers on how to fix noticed problems. Meanwhile, some owners of the explorer reported that the issue wasn’t fixed after the repairs Ford Motor directed in the bulletins were conducted.

No Improvement After Remedy

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In other news, NHTSA wrote, "Some vehicle owners reported little or no improvement after the TSB remedy,"

One owner says,  "Every time the SUV is accelerating over 3,400rpm for a duration of greater than 3-5 seconds, the AC system fills the cabin with nauseating gas,"

"The smell has changed over the course of ownership from burnt hair smell, how to an exhaust, rotten egg/carbon smell ... I am very concerned that exhaust is entering the vehicle at hazardous levels."

Furthermore, the agency now puts effort to assess the potential safety concerns that were raised in a longer list of complaints. 

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