F 150 Heritage 4WD Pickup V8-54L SOHC VIN Z Bi-fuel (2004) DTC P1265 - P1269: System Diagnosis
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For complete diagnosis of the Engine Control system, follow this link: See: Powertrain Management/Computers and Control Systems/Testing and
Inspection
OBD II - BI-Fuel CNG Only
For diagnosis of code P1266 refer to chart