P0401 on Ford: Exhaust Gas Recirculation (EGR) Flow Insufficient
Severity: 2 of 4
Usually safe to drive. You might hear engine knock under load, which over time can harm the engine. Avoid heavy towing and fix it soon.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0401 usually means on a Ford
On older Ford engines with a DPFE sensor, P0401 is frequently caused by the DPFE sensor, which measures pressure across the EGR system, or by cracked hoses attached to it. Replacing the sensor without checking the hoses is a common mistake.
Carbon buildup in the EGR tube and passages also restricts flow.
Most likely causes on Ford vehicles
- Cracked DPFE hoses
- DPFE sensor
- Carbon buildup in EGR tube
- EGR valve
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Ford specific tips
- Inspect the small rubber hoses at the DPFE sensor first.
- Clean carbon from the EGR tube.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| EGR valve cleaning | $10 to $30 | 1.0 to 2.5 h | $10 + 1.0 × $110 = $120 $30 + 2.5 × $190 = $505 |
| EGR valve | $100 to $450 | 0.5 to 2.0 h | $100 + 0.5 × $110 = $155 $450 + 2.0 × $190 = $830 |
Costs are generic for this code; parts and labor on some Ford models may run higher.
Watch a repair video
Search YouTube for “P0401 Ford fix” videos. Pick a recent video that matches your engine, and confirm the diagnosis before buying parts.
Repair manuals
Step-by-step service manuals for Ford with torque specs and wiring diagrams:
Haynes manuals for Ford Chilton manuals
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Check Ford recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Is the DPFE expensive?
Usually moderate, and replacement is often simple.
Read the full P0401 guide or more Ford check engine notes.