On Mon, 30 Jun 2014 11:01:57 -0700 (PDT), True North wrote:

My #2 son gave me one a couple Christmas ago.
I've had no use for it driving reliable new Toyotas, but he used it a number of times on his Dodge Charger and one of his buddies vehicles.
Believe he has to take the error code from the reader and use his smartphone to access a Site where he enters the code and gets the details.

The smaller, cheaper ones provide nothing but the code. The one I'm considering provides the code
and the meaning. The next one up, in the $200-250 range provides all that and adds possible fixes.
They will work on Toyotas also. I'd thought my truck was quite reliable, but once your Toyota is out
of warranty, it's nice to have a good idea of what a problem might be before getting ripped off.