F 150 Super Crew 4WD V8-5.4L Prop SOHC VIN Z (2003)
P1780 - P1784: Testing and Inspection
P1781
For diagnosis of code P1781 refer to chart
P177x - P2196
NOTE 13: Go to Transfer Case. See: Transmission and Drivetrain/Transfer Case/Testing and Inspection
If there is no link in the chart then:
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This code is not a valid code for this vehicle