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Rear AxleFor 4WD vehicles• The vehicle speed is too high.• The left and right rear wheel speeddifference is too high during anengagement attempt.• The system has malfunctioned and isaccompanied by CHECK LOCKINGDIFFERENTIAL in the informationdisplay. See your authorized Forddealer for assistance.E166932Pull the 4WD control knob toward you.For 2WD vehiclesE163191Turn the control to ON.Once the indicator lightilluminates in the informationE163170 display, both rear wheel axleshafts will be locked together providingadded traction.If the indicator does not come on, or theindicator turns off while driving, one of thefollowing has occurred:162F150 (TF6) , enUSA