Hello, I seem to be having an issue with 2 of my 2003 Town Cars. The VIN of the vehicles is shown as "unavailable" or blank in the PCM when read by scanners. I was told by one person that it could be a firmware issue and to upgrade the firmware by re-flashing the PCM. Others said it may be a faulty computer but I am not having any issues at all other then the VIN being blank. Does anyone know if I can re-program the VIN into the PCM? Does anyone know someone that can or will do it? Is there a list of the firmware versions of Ford’s PCMs to see where my current calibration stands (current version or extremely outdated)? Does anyone have any ideas on why the VIN is blank? Any help would be greatly appreciated and I will put my current PCM calibrations for the troubled cars below. Thank you!! #1: -Software: RZAR1LZ.HEX -Module PN: 3W1AAYA #2: -Software: RZAO1BW.HEX -Module PN: 3W1AAGB James Jr.