F 250 4WD Super Duty V10-6.8L VIN Z CNG (2003)
P1120 - P1124: Testing and Inspection
P1120
For diagnosis of code P1120 refer to chart
P072x - P1132
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