Navigator 4WD V8-5.4L DOHC VIN A (2000)
P1870 - P1874: Testing and Inspection
For diagnosis of code P1874 refer to chart
P1837-P1893
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