Hi Gerard.
I don't have any real experience with OBDII, but I was contemplating purchasing 
a code scanner myself. At first I was going to build one until I discovered 
there are plenty to choose from including some that interface to PDAs. Several 
price ranges as well.
Here are a few links if you are interested. The info on the Elm Electronics 
page has a nice description of the OBDII to RS232 interface.
Hope this helps,
John
http://www.elmelectronics.com/obdindex.html
http://www.scantool.net/
http://obddiagnostics.com/
http://www.troublecodes.net/technical/scaninfo.shtml#palm
http://www.lindertech.com/r_dtools.htm#scantools
> Who out there has experience/knowledge of the OBDII systems present 
 
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