A lot of cars companies restrict who can buy parts and what parts. For example if you want to buy the rear quarter panel for a Rivian you must be an approved repair shop and they will only allow so many in a given area. This is not specific to rivian. Lots of car companies do this with newer models. I have a friend who runs a high end repair shop and another who does restoration and the one who does Mercedes restoration won’t work on cars newer than x because he can’t get parts

We csnlt buy BYD cars because our government tariffed them to hell and back. There's literally no reason to not expect the same would apply to parts.

Diagnostic software is beginning to require more and more authentication.

https://www.repairerdrivennews.com/2026/05/14/autoauth-certi...

You now need to be a "certified AutoAuth technician" using a "certified AutoAuth tool" (sure, like a $3000 SnapOn).

Or - some manufacturers ALSO require you to have NASTF Vehicle Security Professional access, which is another whole can of worms with insurance and business requirements.

https://support.nastf.org/support/solutions/articles/4300076...

Hyundai now requires you to have this stupid security professional certification if you dare try to service a modern Hyundai with a (lower cost) J2534 passthru tool instead of the official Hyundai service tool.

All of this still doesn't stop someone from sending packets direct on the CANbus to make a new key to someone's car, but it just makes it more miserable for the rest of us trying to work on the diagnostics of it all.