Possible causes – New PCM-Needs progranming– Incorrect VID configuration Tech description After a new PCM has been installed, the Vehicle Identification (VID) block has to be program to the PCM. There is a service bulletin for the P1639 code for the following models:1999-2002 Lincoln Town Car1999-2001 Lincoln Navigator2002 Lincoln BlackwoodLincoln Factory Service Bulletin OBDII Code…