Having a D2 I realized an OBD-II scanner is a must. I did a bunch of research and settled on the OBDLink MX Scan Tool and Scan XL professional PC software. I also downloaded the OBDScope app onto my nokia phone which will let me read the scan on it.
They're $100 off through the end of today (Nov 28th).
http://www.scantool.net/
I'll give a full report when it arrives.
