F 150 4WD Pickup V8-5.4L CNG VIN M (2001)
P1890 - P1894: Testing and Inspection
P1891
For diagnosis of code P1891 refer to chart
Electronic Shift On Fly (ESOF)
Manual Shift On Fly (MSOF)
If there is no link in the chart then:
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This code is not a valid code for this vehicle
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Or information published by the manufacturer for this vehicle did not include this code
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For complete diagnosis of the Transfer Case, follow this link: See: Transmission and Drivetrain/Transfer Case/Testing and Inspection