Fire inside of the motor, behind the engine computer. Upon researching recalls for Lincoln Navigators I found these other recalls online for possibly the same fire issue: "Ford has issued a recall for some of its 2021 Ford Expedition and Lincoln Navigator SUVs due to a potential engine fire risk. Over 65,000 2021-year model vehicles manufactured between December 2020 and April 2021 have been affected." "We've discovered a vehicle safety issue in some 2021 model-year Lincoln Navigator® vehicles built from July 30, 2020 to August 31, 2021. Some of these vehicles have experienced an under-hood fire, even while parked and off."