F 550 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
P0640 - P0644: Testing and Inspection
For diagnosis of code P0640 refer to chart
Diagnostic Trouble Code Description, Part 3
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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