mr peters summarizes the problems with modern vehicle repair of any sort, and any vehicle though mostly tractors and such but includes your family jalopy; 

 

You have probably heard about what are styled right to repair laws – or efforts to get such laws passed. They are a response to the encoding of cars; more finely, to the denial of access to the coding that runs the computer-controlled modern car. Not just the engine but everything, down to the power windows (which are controlled by mini-computers called body control modules). Your name may be on the title and you’re the one who paid for the vehicle – but ownership is effectively claimed by the vehicle’s manufacturer, who claims perpetual ownership over the code (the software) that runs the vehicle and its systems.

It is the Bill Gates model applied to vehicles.

You may remember when you bought a box that contained a CD that had the software in it. Once you bought what was in the box, you owned what was on the disc that came in the box. You could install it on multiple computers. You could give the CD (and so the software) to your kid or a friend and they could use it, much as you could hand-me-down your old car to your kid. That changed – as regards software – when Gates decided to sell you a license to use the software rather than the software itself. This license was limited. You could not make a copy or hand it down to your kid. You also had to pay again at some point to continue to be allowed to continue to use the software..........more........