P1304
EGR Calibration High
Findings, check these first
- Excessive EGR flow from a sticking-open valve
- DPFE sensor biased high
- Missing EGR restrictor after service
- Vacuum fault holding the valve open
- Calibration drift
Standard procedure
- Check the valve for sticking open
- Verify DPFE readings
- Confirm correct restrictor and gaskets fitted
- Test vacuum controls
- Relearn calibration after repairs
Code lookup
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Sources and review
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- OBDII.pro: P1304 Ford definition
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Supports: Ford-family meaning for P1304: EGR Calibration High
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Last updated 2026-09-05.
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