P1405
FordDPFE Sensor Upstream Hose Off Or Plugged
The DPFE sensor measures pressure differences in the EGR system so the engine computer can assess EGR flow. This code points to a possible disconnected or plugged upstream hose, which can distort the pressure signal. That may affect emissions or drivability, but the code does not prove that the sensor itself has failed.
⚠️ Before You Begin (Safety First)
If the engine runs poorly, stalls, or loses power enough to make driving unsafe, stop and arrange help. Otherwise, avoid prolonged driving with the warning light on and have the fault diagnosed. Check hoses only with the engine off and cool.
Common Symptoms
- The check-engine light may be on, with no noticeable change in how the vehicle runs.
- A disconnected or restricted hose can give the computer an inaccurate indication of EGR flow, potentially causing rough running or hesitation.
- Emissions may increase if EGR flow is not monitored or controlled correctly.
Common Causes
- The DPFE sensor's upstream hose may be disconnected or loose.
- The upstream hose or a connected pressure passage may be plugged or restricted.
- The hose may be damaged or routed incorrectly.
- A fault in the DPFE sensor, its wiring, or a related connection may produce a similar pressure signal; the code alone does not establish which part is at fault.
Diagnostic Steps
- With the engine off and cool, locate the DPFE sensor and hoses using service information for the exact vehicle.
- Visually check the upstream hose and its connections for disconnection, cracks, kinks, or other obvious damage.
- Check for an apparent restriction in the hose and accessible pressure passages. Do not force tools or compressed air through them.
- Inspect accessible sensor electrical connections and wiring for looseness or visible damage.
- If the hose and connections look sound, have the DPFE signal and EGR operation checked with appropriate scan data and vehicle-specific service information.
When to Call a Professional
Inspect the upstream hose and its connections for disconnection, restriction, damage, or incorrect routing. Use scan data to assess the DPFE signal alongside EGR operation, then check the sensor, pressure passages, and related wiring before replacing parts. Exact tests depend on the model, year, and engine.
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Commonly Asked Questions
Does P1405 prove that the DPFE sensor needs replacement?
No. The code describes a possible upstream hose-off or plugged condition. Inspect the hose, connections, and pressure passages, and test the sensor and wiring before replacing parts.
What does the DPFE sensor do?
It measures pressure differences associated with EGR flow and provides that information to the engine computer. A hose problem can make the pressure signal misleading.
Can I keep driving with P1405?
If the vehicle runs normally, a short trip for diagnosis may be reasonable, but do not ignore the warning. Stop driving if it stalls, runs severely rough, or loses power enough to make the trip unsafe.
Can a plugged hose cause the same code as a disconnected hose?
Yes. Either condition can interfere with the pressure signal. The hose and passages need to be inspected rather than assuming one specific cause.
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