With the OBDII system on your car, the Scangauge II *should* be able to pull all the codes that Autozone (or your local parts store) can. In addition to that, you also have the ability to display real-time gauges, as well as real-time/trip/average MPG/FE figures.
Just wish I could use it on Julie....but alas, OBDII is only on vehicles 96 and newer.....
jwxr7, yes that's what I meant. I should have quoted that. The only thing I could find was emissions testing, but the explaination on the SGII site was confusing.