P1403
FordDPFE Sensor Hoses Reversed
The DPFE sensor uses pressure from two hoses to help the engine computer estimate EGR flow. If those hoses are crossed, the pressure signal can be interpreted incorrectly and the computer may detect an EGR-flow problem. The code does not prove the sensor itself needs replacement; exact routing and checks depend on the vehicle’s model, year and engine.
⚠️ Before You Begin (Safety First)
This fault is generally not an immediate safety emergency, but incorrect EGR operation can cause rough running, hesitation or stalling. Stop driving if the engine stalls or runs too poorly to control the vehicle safely.
Common Symptoms
- Check-engine light, with or without noticeable drivability symptoms.
- Rough idle, hesitation or stalling may occur if incorrect EGR-flow feedback disrupts engine operation.
- Increased emissions may result if EGR flow is not controlled as expected.
- The vehicle may show no obvious symptoms apart from the warning light.
Common Causes
- The two DPFE pressure hoses are connected to the opposite ports.
- Hoses were incorrectly routed or reconnected after service.
- A hose is cracked, loose, kinked, blocked or leaking, which can distort the pressure signal and resemble a routing problem.
- If hose routing and condition are correct, a DPFE sensor or circuit fault may need to be checked rather than assumed.
Diagnostic Steps
- Check the vehicle’s model- and engine-specific service information for the correct DPFE hose routing before moving any hoses.
- With the engine off and cool, compare the hose connections with the routing information; confirm the hoses are not crossed.
- Inspect the hoses for cracks, looseness, kinks, heat damage or blockage, since any of these can distort the pressure signal.
- Correct routing or replace visibly damaged hoses only when the correct connections are clear from service information.
- After any correction, have the code cleared and verify operation with an appropriate scan tool; seek diagnosis if the code returns.
When to Call a Professional
Use model- and engine-specific service information to confirm which DPFE port each hose belongs on. Check hose routing and condition first, then use scan data to assess the DPFE signal during EGR operation. If routing is correct, inspect for leaks or restrictions and test the sensor circuit before replacing parts.
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Commonly Asked Questions
Does P1403 mean the DPFE sensor must be replaced?
No. The definition points to reversed DPFE hoses. Confirm hose routing and condition first; test the sensor and its circuit if the hoses are correct.
What do the DPFE hoses do?
They carry pressure from two points in the EGR system to the DPFE sensor. The sensor uses the pressure difference to help the engine computer estimate EGR flow.
Can reversed hoses cause drivability problems?
They can produce misleading EGR-flow feedback, which may contribute to rough running, hesitation or stalling. Some vehicles may have no noticeable symptoms.
Can damaged hoses cause the same kind of signal problem?
Yes. Leaks, kinks or restrictions can distort the pressure signal. Inspect the hoses and verify their routing before concluding that the sensor has failed.
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