P1405 – DPFE EGR Sensor Upstream Hose Off or Plugged (Ford)

Description

P1405 on Ford vehicles indicates that the Differential Pressure Feedback EGR (DPFE) system has detected an abnormal pressure signal from the upstream EGR hose. The fault is commonly caused by a disconnected, blocked, damaged or incorrectly routed DPFE hose, but related EGR tube or DPFE sensor problems may also be involved.

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Symptoms

Check Engine Light may be on
Engine may run normally with no obvious symptoms
EGR-related drivability problems may occur
Rough running or hesitation may occur in some cases
Other EGR-related fault codes may also be stored

Causes

Upstream DPFE hose disconnected
Upstream DPFE hose blocked or restricted
Damaged, cracked or incorrectly routed DPFE hose
Moisture or ice inside the DPFE hose
Blocked or damaged EGR tube
Incorrectly mounted or faulty DPFE sensor
Wiring or connector fault affecting the DPFE sensor

Diagnosis

Read and record all stored and pending fault codes
Check for additional EGR-related codes
Inspect both DPFE hoses for correct connection and routing
Check the upstream hose for blockage, moisture, ice, cracks or collapse
Inspect the EGR tube for damage or restriction
Inspect the DPFE sensor mounting, connector and wiring
Monitor DPFE live data with a compatible diagnostic scanner
Compare DPFE readings with the expected no-flow condition
Follow the Ford-specific EGR diagnostic procedure for the vehicle and engine

Repair

Reconnect a disconnected DPFE hose
Replace a damaged, cracked or restricted DPFE hose
Remove confirmed blockage or moisture from the hose and correct the underlying cause
Repair or replace a damaged or restricted EGR tube
Repair damaged wiring, terminals or connectors
Replace the DPFE sensor only if testing confirms it is faulty
Verify the repair by clearing the code and confirming that P1405 does not return