You didn't read my post very well. The Manuson-Moss Warranty act allows someone to work on their car. It doesn't allow you to modify it to be out of spec, or to disable systems like emissions and safety.
Relative to software code in the vehicle, I think the manufactures can always argue you don't own the code. It's liscenced and a part of your vehicle, just like the OS on your computer, phone, tablet is liscenced for you to use, you don't own the operating system. The SW code also controls much of the safety critical functions. Given the rash of high dollar lawsuits for safety related issues, I can see why they are pushing for this.
You still have the right to do normal routine maintenance on your car and have your warranty 'intact'.
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