I use the PLX Kiwi and torque pro android app.
Some people have had luck with the 20$ ebay scanners I tried one and it was DOA
Kiwi is awesome.
http://www.plxkiwi.com/kiwibluetooth/
https://market.android.com/details?id=org.prowl.torque&hl=en
running it on the jeep? i plan on getting this exact setup soon.