Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hi Im David, thanks for visiting the site,
If the sensor is new, then the next step is to follow the vacuum lines from the sensor to the intake looking for cracks, holes or disconnections. Next, the electrical connector should be inspected for loose or broken pins, broken wires in the harness, or rubbed through wire possibly grounding out. If all these che3ck out, then the next step is going to be to have the PCM re-programmed. Ford actually issued a Technical Service Bulletin on this issue back in the day that suggest the calibration of the PCM's ability to read this sensor is off. Just make sure to double check the vacuum lines first, to eliminate obvious faults.
Here is the TSB:
^MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - NO DRIVEABILITY CONCERNS PRESENT - DIAGNOSTIC TROUBLE CODE (DTC) P1443 STORED IN MEMORY
The Malfunction Indicator Lamp (MIL) may illuminate and Diagnostic Trouble Code (DTC) P1443 may be stored in memory. There may be no driveability concerns present.
Reprogram the Powertrain Control Module (PCM). The revised calibration will recalibrate the EVAP to test for sufficient flow under normal driving conditions. This should reduce the possibility of the MIL lamp illuminating.