On the 2002 Ford Windstar, the P1401 is a fairly straight forward code pointing to a fault with the Differential Pressure Feedback EGR (DPFE) Sensor. It’s actually a fairly common fail item on these vehicles. Carefully inspect the rubber lines at the bottom of the sensor for any cracks, holes or loose/missing connections. Inspect the pipe the lines connect to for any cracks, holes or signs of leaks. Inspect the electrical connector and as far up the harness as you can, looking for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the DPFE Sensor should solve the problem. It’s located on the top, front of the engine.
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