"a lot of people don't know this; for almost any ICE car in the US, you can buy a 3-day or 1-week subscription to the dealership level diagnostic software for a somewhat reasonable fee and use it with a J2534 device"

Whoa, didn't know that. Well the caveat is finding a decent J2534 device, right? There are a lot of cheapo knockoffs. Then actually knowing how to use the software with it.