Excursion 2WD V10-6.8L VIN Z CNG (2003)
P1440 - P1444: Testing and Inspection
For diagnosis of code P1443 refer to chart
DTC Index P0442 - P1450
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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For complete Evaporative Emissions diagnostic information, See: Powertrain Management/Computers and Control Systems/Testing and Inspection