A 4-pin Ford pigtail used across multiple engine-bay sensors. pigtail program exists exactly to replace damaged connectors/terminals rather than full harnesses.
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Intermittent sensor codes after bumps/heat-soak
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Broken lock tab or loose fit
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Green/white corrosion on terminals
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Wiggle test changes idle or trims
Root causes
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Age/heat brittleness of housings and lock tabs
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Terminal spring tension loss or corrosion at the crimp
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Incorrect aftermarket terminals for the cavity size
Correct repair, step by step
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De-pin and inspect terminals; replace if spring tension is weak.
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Re-terminate with the correct open-barrel crimp and wire-seal (if present).
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Confirm pin indexing and latch engagement.
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Clear codes; road test.
Fitment note: Listings for 13927329 / WPT-1309 / CU2Z-14S411-AYA appear across Ford/Lincoln/Mercury applications (generic pigtail listing, confirm by connector shape/keying).
FAQ:
Q: Can I reuse old terminals? A: Not recommended; loss of tension causes recurrences.
Q: Solder or crimp? A: Use correct open-barrel crimps; solder wicks and stiffens harness near the connector.
