Editing Ford Explorer (section)

====4WD Transfer Case / Power Takeoff Unit (PTU)====
The 2011 through 2019 Explorer and Police Interceptor Utility models equipped with 4WD may experience severe issues with the four wheel drive system. Due to the transfer case/power takeoff unit's close proximity to other high-heat components such as the exhaust manifold and transmission, along well as its small fluid capacity (about 0.5 U.S. quarts), it may be subject to repeated overheating resulting in internal bearing wear and premature failure. Common symptoms of a failed PTU include grinding or whining noises coming from under the vehicle, a natural-gas or oil type odor emitting from the engine bay, fluid leaks, and in severe instances, the vehicle will not move. Ford has made several design revisions to the PTU over the years to combat failure, including the addition of a fluid drain plug, temperature sensor, an external oil cooler (on select models), and revisions to the internal idler bearing.<ref>{{cite web |title=Whats New for the 2017 Police Interceptor Program |url=https://www.qgdigitalpublishing.com/publication/?i=634589&ver=html5&p=36 |website=www.qgdigitalpublishing.com |access-date=11 February 2024}}</ref><ref>{{cite web |title=How Ford All-Wheel Drive Power Transfer Units Fail and What You Can do to Prevent it! |url=https://www.youtube.com/watch?v=7yLkr609bfI&t |website=www.youtube.com | date=April 14, 2020 |access-date=11 February 2024}}</ref><ref>{{cite web |title=An In-Depth Analysis of Potential PTU Improvements [Step-By-Step Guide] |url=https://www.fortheworkshop.com/an-in-depth-analysis-of-potential-ptu-improvements/#INTRO |website=www.fortheworkshop.com |date=June 21, 2020 |access-date=11 February 2024}}</ref>