I bought a Bluedriver a while ago, as it picked up not only the MIL lights but all the other codes as well. Usefull tool, but one of the more expensive ones and it will only talk to it's own app.
Can't use Torque or the like to display data from it.
So far it has found the bad front wheel speed sensor, a bad injector, intermittent EGR valve, (cleaned & currently working again), & now told me about the problem cat converter.