Possible causes – New PCM-Needs programming– 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 Ford Mustang2000-2002 Ford Focus1999-2002 Ford Expedition1999-2002 Ford F-1502000-2002 Ford E Series2001-2002 Ford…