More than likely you have a faulty EGR Valve Pressure Sensor, especially if your EGR Valve Pressure Sensor is the original metal type. The new sensor is made of plastic and doesn't corrode like the old design. This sensor is located on the Intake Manifold.
Here is the sensor: http://www.autozone.com/autozone/parts/2001-Mercury-Sable/EGR-Valve-Pressure-Sensor/_/N-jfkhrZ93y2i
It is also possible that the EGR Valve has a clogged port, but this is less likely.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
Yes, the definition of the code P0401 is: "exhaust gas recirculation--insufficient flow detected."
This means the Exhaust Gas Recirculation (EGR) valve is not working properly. The electrical wiring leading up to this valve could be faulty. If there is a vacuum line to this valve, the line could be disconnected, or cracked. The valve itself may be faulty (electric coil problem or vacuum diaphragm leak) or choked with carbon deposits and need to be cleaned. The passages in the cylinder head that lead to this valve could be choked with carbon deposits and need to be cleaned.
P0401....Exhaust Gas Recirculation Flow Insufficient Detected
best advice with the EGR valve problem is to make a gasket with a coca cola can and sel it off completely
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