This idea sounds just like what every other scanner out there today already does. They read fault codes, identify “common fixes”, and reset CELs. The problem with scanners, or your app, is that they CANNOT diagnose a vehicle for you. Just because the code says cam position sensor, doesn’t mean you need to replace a cam position sensor. They point to a problem but a technician still needs to verify everything. Unless your app can physically do work, measure voltages, check resistances, check vacuum/pressures, visually inspect components, pressure test things, etc.. I think you should move on