Ford has been, however, sued multiple times over the Magnuson-Moss Warranty Act of 1975, for trying to void the warranty if you made aftermarket changes. Because you bought the Ford and the laws say it's yours, you are free to rip out the Ford engine and put in a Honda engine if you so please. (Emissions laws notwithstanding.) If Ford was saying you cannot tear out the engine on a car you own and put in a different one, and they welded the hood shut, then it would be a better comparison. Neither Ford nor Apple would be so foolish though. It's just that the metaphorical hood welds in the iPhone's case havent been broken recently.
That's a different subject matter. But how is Ford supposed to be able to guarantee the functioning of a car that they didn't make? Since you made it yourself by making changes? It makes sense that they would challenge such warranty claims all the way to the court.
A lot of things on cars are welded or otherwise very difficult for the customer to modify, and I don't think any court would have a big problem with that.
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