EEC-V or EEC-VI?

It's probably EEC-VI. The Mustang uses the "Black Oak" PCM system which is the same thing that the 2003 and new Lincoln LS & T-Bird use as well as the 2004 and newer F-150.
 
Speed_Demon1965 said:
Is the 2005 using an EEC-V or EEC-VI? I read that the EEC-VI came out in 2003, but Fords website still claims that most of their 2005 vehicles are using EEC-Vs. :shrug:

Thinking about it some more, are you sure that you didn't read that EEC-V came out in 2003 and most products were using EEC-IV until that point? A lot of Ford products switched to the new PCM system in 2005 which I assume is EEC-V
 
Nice link Speed Demon1965.

It sounds like the correct answer is EEC-V 2.0, the newer flash memory version. Just saying it is EEC-V leads to confusion that the PCM system is the same as what is in the 99-04 Stangs, which is not the case.

However Ford did not introduce ETC until the 2003 Model year, so something had to change to handle the ETC, which the 2005 Stang has.