Vehicle Fitment-1: Compatible with Ford Escape 2011-2012 3.0L, Explorer 2013-2014 3.5L (Naturally Aspirated), Explorer 2015 3.5L, Flex 2013-2015 3.5L---Naturally Aspirated, Front-B2S2, Rear-B1S2, Compatible with F-150 2015-2017 2.7L/5.0L---Left-B2S2, Right-B1S2, 2011-2014 3.5L, 2015-2016 3.5L (Naturally Aspirated), 2017 3.5L (Naturally Aspirated, Left-B2S2, Right-B1S2), 2011-2014 3.7L Vehicle Fitment-2: Compatible with Ford Police Interceptor Sedan 2013-2015 3.5L (Naturally Aspirated, Front-B2S2, Rear-B1S2), Police Interceptor Sedan 2013-2016 3.7L (Front-B2S2, Rear-B1S2, To 12/07/2015), Police Interceptor Utility 2013-2015 3.7L (Front-B2S2, Rear-B1S2), Taurus 2013-2015 3.5L (Naturally Aspirated); Compatible with Mercury Mariner 2011 3.0L Vehicle Fitment-3: Compatible with Mustang 2011-2017 3.7L, 2015-2019 5.2L, 2011-2012 5.4L---Left-B2S2, Right-B1S2, 2011-2014 5.0L, 2013-2014 5.8L; Compatible with Lincoln MKS 2013-2016 3.7L (To 12/07/2015), MKT 2013 3.7L, MKT 2014 3.7L (Post Cat Sensors 17.75"), MKT 2015 3.7L (Post Cat Sensors 17.75", B2S2), MKZ 2013-2014 3.7L, MKZ 2015-2016 3.7L (Front-B2S2, Rear-B1S2) Reference Number: BE5Z9G444C, BR3Z9G444A, BL8Z9G444A, 250-24989, 25024989, 234-4490, 22133, 22135 Specification: Wire Quantity: 4; Sensor Type: Heated; Mounting Type: Threaded; Connector Gender: Female; Package Quantity: 2x Oxygen Sensor; Packaging Type: Box.