I am thinking to invest and buy an OBD-II scanner. Before I do that, I need to know for how long automakers will comply and support OBD-II standard. I am asking since I am planning to buy a 2019 Toyota Hybrid model, and if I know that it won't support OBD-II, I would not buy such tool.
OBD-II has been mandated in every vehicle sold in the US and produced from 1996 onward. Europe has something called EOBD, which uses the same protocol and connector as OBD-II. Japan calls theirs "JOBD". I suspect it will be relevant for a very long time.
While OBD-III is in the works, it is still OBD-II at it's core. The protocols may be different in OBD-II, so it is questionable whether OBD-II scanners will have any functionality on OBD-III equipped vehicles.
When? No time soon. The biggest advance in OBD-III is it's ability to transmit emissions data (and failures) via satellite and other broadcasts. This enables random enforcement from "Big Brother". As soon as a CEL or SES "Check Engine Light" appears, the vehicle can immediately rat you out to authorities. There have also been some proven exploits of the technology, which enable remote "hackers" to gain control of certain vehicle systems.
Obviously this doesn't sit well with people who believe in privacy and the 4th Amendment of the US constitution. Similar attempts at "un-witnessed" enforcement have failed in the courts - things like a speeding ticket based on time difference between two toll stations with synchronized clocks.
The upshot is that OBD-II is here to stay. Incredibly powerful scantools can be had for $100-$130 US; Autel is a brand that comes to mind. These tools not only read all sorts of protocols for generic P0xxx codes, but can also read and interpret OEM P1xxx codes, Bxxxx body codes, Cxxxx chassis codes, Uxxxx network codes, perform monitor readiness checks, display and graph PID Parameter IDs, diagnose SRS and ABS problems, and other neat tasks. For a mere ~125 bucks from Amazon or eBay.
Any OBD-II scan tool will work to some extent on a 2019 Honda Hybrid, but Hybrid vehicles have some additional modes and codes that the tool may not support. Still, do your research - I am very familiar with the Autel brand, but there are many others. Manufactures will specify what level of additional "hybrid" support the tool is capable of.
I honestly cannot imagine not having a tool like this. I also have a Snap-On Solus with Domestic/Euro/Asian software and adapters, but many thousands of dollars later, I just grab the Autel for most jobs.