F 250 4WD Super Duty V10-6.8L VIN Z CNG (2003)
P1640 - P1644: Testing and Inspection
For diagnosis of code P1641 refer to chart
P1502 - P176x
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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