F 250 4WD Super Duty V10-6.8L VIN Z CNG (2003)
P0220 - P0224: Testing and Inspection
P0221
For diagnosis of code P0221 refer to chart
P0153 - P0230
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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