 This is our second Explorer. Bought the first one in July of 2014. Anytime you accelerated to pass a car or just sped up, there was a smell of exhaust fumes in the cabin. After many trips to the dealer and finally filing a complaint with Ford, they reacquired the vehicle in October of 2015 and we purchased a  2016 model. We were told that problem had been repaired on the 2016 model. That was not the truth. We are now going through the same process with a complaint. Not sure how this will turn out but will not have another Explorer. And that is really sad because we love everything about it with the exception of not being able to breathe when the cabin fills with exhaust fumes. 2-28-18 Wouldn’t own another Ford if they were half price! Worked with Ford a few months to repair problem but was never repaired. They finally stopped returning our calls so we traded it off for a vehicle we could drive that didn't almost cause us to pass out.  We love our Toyota Highlander and will NEVER own another Ford!! Of course we lost a boatload of money on the trade in.After several trips to have the problem repaired (and it wasn't), Ford  cleared our complaint and stopped taking our calls. We finally bit the bullet and traded it in at a high loss for a Toyota Highlander. We love the Highlander and will NEVER purchase another Ford product!!