Some 2015-2018 Edge and 2016-2018 MKX vehicles may exhibit an exhaust odor in the vehicle while the climate control system is in auto or recirculation mode. Customers may indicate the odor smells like sulfur or exhaust odors are entering the vehicle cabin. This concern may be more pronounced after hard acceleration, driving in hilly conditions and/or towing a trailer. Whether and to what extent any occupant of these vehicles experiences the exhaust odor will be affected by driving habits, weather, and individual sensitivities. Follow the Service Procedure steps to correct the condition.