I have a snap-on mt2500, and two other generic scan tools. I can get hard codes on most vechicles. I can't get certain codes or repair information on many newer vechicles.
The problem arises when you have an intermittent problem, and need access into those propriatiatry systems. The dealerships get software updates, but automotive companies are not required to inform anyone that there's been an change to the existing software.
In states like CA, which are very strict with emissions; failing a smog check because you have on old version of firmware is beyond frustrating. Most people have no idea that the reason they failed is due to an older software. Most smog shops don't even have information the dealerships have. It's a lot of trial and error to get that vechicle to pass those smog checks. It's not right. It should violate The Sherman Anti-Trust Act?
There are many indepent Auto Shops that are hobbled.
They need access to at least the dealership scan tool. I believe Massachusetts is the only state that enacted a "Right to Repair" law. If you live in that state, you can buy expensive dealership repair manuals, and get the opportunity to spend thousands on their scan tools. Just to find out what system/lazy sensor/etc. is broken in a vechicle you bought?
Having to take you vechicle to only the dealership is---un-American?