P1401moderate severityPowertrain
DPFE Sensor Circuit High Input
on 2000 Ford Windstar 3.8L V6 · FWD
What this code means
The DPFE sensor circuit is reading above the maximum expected voltage. This indicates the sensor is reporting excessive EGR flow or has an electrical fault causing a high reading.
Symptoms
- Check Engine Light
- Rough idle
- Engine surge
- Poor fuel economy
- Knocking or pinging
- Failed emissions test
Common causes
- Faulty DPFE sensor (corroded internally — most common)
- DPFE sensor hoses reversed
- Clogged EGR metering orifice
- Wiring short to power
- Vacuum leak in EGR system
Diagnostic steps
- Check DPFE sensor voltage (key on engine off, should be ~0.45-0.55V, if >1V sensor is likely bad)
- Verify DPFE hoses are connected correctly (not reversed)
- Inspect EGR metering orifice for blockage
- Check wiring for shorts to power
Repair notes
Replace DPFE sensor — most common cause. Verify hoses are not reversed. Clean EGR passages.
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