To everyone with this issue here is my story. 2013 Ford Explorer XLT, took it in a total of 3 times, finally 3rd dealership performed TSB, issue vey persistent. Entered BBB Auto line Process, Ford defaulted on mediation, proceeded in to arbitration Arbitrator test drove vehicle smelled the smell. Arbitrator requested technical expert inspect vehicle. Inspector came drove and inspected vehicle. Could not pin point smell, but definetly said that it was not normal. Arbitrator made decision to let Ford attempt repair AGAIN. I am getting an Attorney to start a class action lawsuit. WHY? You may ask, my son has serious breathing/asthma issues. Since I have had this car he has been on his inhaler every 4 hours and has had bronchitis 5 times. Upon research, it is proven that the chemicals in exhaust affect small children and those with lung issues more than anyone. It is very disappointing that FORD does not stand behind their vehicles.