F 150 Heritage 4WD Pickup V8-5.4L CNG VIN M (2004)
P1900 - P1904: Testing and Inspection
For diagnosis of code P1900 refer to chart
P1641-P2106
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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