2015-2016 Edge/MKX/Flex/MKT/MKZ/MKS/Taurus/Taurus Police/Explorer/Explorer Police vehicles built on or before 10-Jun-2016 and equipped with a 3.5L or 3.7L engine, all wheel drive (AWD) and a power transfer unit (PTU) may exhibit a PTU venting, an odor originating from the PTU, or noise originating from the PTU. These vehicles may be a candidate for rebuild using PTU Idler Gear/Shaft/Bearing Kit (GB5Z-7P258-A). Refer to Workshop Manual (WSM), Section 308-07.