F 350 4WD Super Duty V10-6.8L VIN S (2004)
P1260 - P1264: Testing and Inspection
P1261
OBD II - Base Gasoline
For diagnosis of code P1261 refer to chart
P1151-P1309
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