What causes P1431 on a Ford?

Trigger wheel learn never completed after a PCM reset Rough roads preventing the learn procedure Failing crank sensor giving an unstable profile Aftermarket flywheel with a different tooth pattern Low battery interrupting the learn

How do I fix P1431 on a Ford?

Perform the trigger wheel learn on a smooth road per procedure Verify crank signal stability first Confirm stock flywheel and sensor parts Maintain stable battery voltage during the learn Re-run until the monitor enables

P1431 Misfire Monitor Disabled - Unable to Learn Trigger Wheel Profile

Q: What does P1431 mean on a Ford?

P1431 — Misfire Monitor Disabled - Unable to Learn Trigger Wheel Profile. Applies to F-150, Mustang, Explorer with profile-corrected misfire detection.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: F-150, Mustang, Explorer with profile-corrected misfire detection

What does P1431 mean on a Ford?

P1431 — Misfire Monitor Disabled - Unable to Learn Trigger Wheel Profile. This Ford-enhanced code applies to F-150, Mustang, Explorer with profile-corrected misfire detection.

Common causes of P1431

Trigger wheel learn never completed after a PCM reset
Rough roads preventing the learn procedure
Failing crank sensor giving an unstable profile
Aftermarket flywheel with a different tooth pattern
Low battery interrupting the learn

How to fix P1431

Perform the trigger wheel learn on a smooth road per procedure
Verify crank signal stability first
Confirm stock flywheel and sensor parts
Maintain stable battery voltage during the learn
Re-run until the monitor enables