Possible causes – Faulty Differential Pressure Feedback Electronic (DPFE) sensor– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection Tech description There is a factory service bulletin for the following Lincoln models: 2001-2002 Lincoln Town CarLincoln Factory Service Bulletin OBDII Code P1401 Code…