this post was submitted on 28 Dec 2025
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I doubt it will be completely impossible - we'd just be returning to a situation similar to game consoles and modchips - any aftermarket parts need to lie to the "authentication" checks in place first.
I would expect that certain aftermarket groups would specialize based on popular models, maybe even prioritizing models designed to be interoperable with others design and parts wise (Subaru and perhaps Toyota comes to mind).
If it doesn't affect emissions those mod chips will not violate your warrantee - magnuson-moss was writen decades ago to protect replacing your factory radio. There are a number of other laws around third party access to car diagnostics.