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DTC codes / Ford codes / P1403
P1403 on Ford vehicles indicates that the differential pressure feedback electronic (DPFE) sensor has detected a reversed hose connection, meaning the two pressure hoses that connect the sensor to the exhaust gas recirculation (EGR) tube are swapped. The powertrain control module (PCM) compares the pressure signal from the DPFE sensor to expected values and sets this code when the signal indicates the hoses are reversed, which causes the EGR flow calculation to be incorrect.
Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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