Hi Cris,
My obd2 scanner is -
a ieGeek® WiFi Wireless OBD-II Mini ELM327 OBD2 Auto Car Diagnostic Scanner Tool Adapter Reader Scan Code Tester for iPhone4S/5 iPad4 iPod mini IOS PC Windows, Android Device
From Amazon, I'm using DashCommand from the iOS App Store at the mo, to monitor fuel consumption, I've no fault codes, I've double checked with another app, I'm looking for an indication of how far i can go on my remaining fuel, I'm averaging about 34mpg doing mainly town driving at the moment,
Are you sure your connected by Bluetooth, have you gone into settings to double check, do it with engine running, I'd try it connected, on a journey to give the app time to read everything from the car as well, my app can take 30 seconds to settle down the data recived, if you still have no success, can you get a refund on the scanner and try another model, mine cam recommended by a few people on Amazon,
Keep this updated