Newest Elm327 Bluetooth V1.5 OBD2 OBD II Auto Diagnostic Scanner Mini Adapter : Amazon.com : Automotive That's the inexpensive bluetooth reader I just got. You may be able it at a lower price elsewhere. But anything under $20 is reasonable. To interface with it, there's an Android app for $5 called Torque. It works really well... definitely worth consideration. Search the forum. There's lot of discussion about the scanner & app.
