P1284 Self-Test Not Complete - Fuel Pressure Sensor Failure
What does P1284 mean on a Ford?
P1284 — Self-Test Not Complete - Fuel Pressure Sensor Failure. This Ford-enhanced code applies to F-150, Explorer, Ranger with monitored fuel pressure.
Common causes of P1284
- Failing fuel pressure sensor aborting the test
- Intermittent sensor dropout
- Wiring fault during the test
- Low voltage interrupting the self-test
- Failing pump skewing test results
How to fix P1284
- Verify battery voltage and re-run the test
- Graph fuel pressure sensor stability
- Inspect sensor wiring
- Confirm pump output meets spec
- Replace the sensor if it drops out mid-test