F 150 Heritage 4WD Pickup V8-5.4L SOHC VIN Z Bi-fuel (2004)
![background image](/ford/f_150_heritage_4wd_pickup/v8-5.4l_sohc_vin_z_bi-fuel/Page-307002.png)
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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 P1277 refer to chart