A car as 2x can bus lines, with 2x different speeds, even if you have can bus adapters
It is the software who help a lot for obd2 functions, it will not work the same as can bus interface, i have the "usb2can" module, sure you see the data streams, but you have to decode it in a sense, and to know from whom it came and where it goes etc ..... you work at another level
Like when people want to add some speedo projects, more modern dash interfaces etc ...
ELM327 was doing the "magic", and with obd2 software tools you could do ECU AC Air bags ..... functions, and many other things
yeah me too i should have bought the last v2 chips before they gone out of business,
I do have some adapters who have the real ELM design, minus the latest v2 chip version ... the v1.5 leaked and now many pretend v2 etc ... which are all fakes, unless as i wrote you find an genuine one.
You are stuck buying real obd2 tool like Autel, Foxwell, Creader, X431, Launch, VCM2 devices and many others "genuine" ones with frequent updates ....
I have an Suzuki VCM2 who do Ford and GM cars, but not others ... and i paid a lot for it
Ultimate devices who support all the Can protocols ( Iso, Kw, SAE) will cost $$$, J2534 interface(s) where supposed to offer that at lower prices ?? obdexpress is a good place to find many things but ... not cheap
Not a 10-20$ "ELM" device