The ELM327 USB allows you to turn your computer into an Auto Diagnostic System. This is all you need other than your car, the free software & your computer.

Features:

Read Codes: Display all Trouble Codes and Descriptions. Poll some codes more frequently than others. View minimum, maximum, & current values.
Export Data for spreadsheet & printing.
Clear Codes: Arrange, add and delete codes to your specifications.
Monitor real time data in Metric & U.S. Standard.
Record & Graph data.
Performance Timer: 0 to 100 km/h
Many advanced features!

Compatible Vehicles:

OBD2 protocols supported: J1850PWM, J1850VPW, ISO9141, ISO14230 (KWP2000), Plus CAN-BUS (J1939, ISO15765-4).

Specifications

Includes 16 Pin Connector with Interface (Elm chip included) & USB Cable.
Elm Chip installed.
Connects to your computer using USB port.
Compatible with J1850PWM, J1850VPW, ISO9141, ISO14230 (KWP2000), Plus CAN-BUS (J1939, ISO15765-4) Protocols.
LED Status lights.
Powered by the vehicles OBD2 Plug.
Use it on a Palm OS, Pocket PC & Unix too! (on supporting software)

Software

Free software.
* Scantool User-Friendly.
* OBD Gauge for Palm OS & Pocket PC by Dana Peters.
* OBD Logger Windows & Unix by Jonathan Senkerik.
* OBD-II ScanMaster English, German & Russian by Wladimir Gurskij.
* OBD-II ScanMaster Pro
* obd2crazy Flexible Data Logging & Advanced User Tools.
* OBDII for ELM322 by David Huffman.
* RDDTC Simple Read and Reset software. by Pete Calinski.
* Real Scan Simple Read & Reset software good for older computers. by Brent Harris.
* ScanTest for Pocket PC by Ivan Ganev.
* RDDTC Simple Trouble Code Reader.
* EasyOBDII Low cost support available.
* GM Mode 22

NON-free software
* Pocket Scanner Plus
* Digimoto
* PCMSCAN
* ProScan
* WGIobdII