P1431
Misfire Monitor Disabled - Unable to Learn Trigger Wheel Profile
Findings, check these first
- 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
Standard procedure
- 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
Code lookup
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Sources and review
Review: qualified. Read the source limits below.
- OBDII.pro: P1431 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1431: Misfire Monitor Disabled, Unable to Learn Trigger Wheel Profile
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Last updated 2026-09-06.
Report a correction for P1431. Include your vehicle, the issue and a source if you have one.
This fault is part of the Ford fuel and ignition codes guide. It covers the family and the order to check it.