P1457
Unable to Pull Vacuum in Tank
Findings, check these first
- Large EVAP leak defeating the vacuum draw
- Weak purge solenoid flow
- Stuck-open vent path
- Leaking filler seal
- Faulty tank pressure sensor
Standard procedure
- Smoke test for the leak first
- Test purge flow volume
- Verify the vent seals when commanded
- Check filler and cap sealing
- Confirm the pressure sensor reads vacuum changes
Code lookup
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Sources and review
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- OBDII.pro: P1457 Ford definition
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Supports: Ford-family meaning for P1457: Unable To Pull Vacuum In Tank
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Last updated 2026-09-06.
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