There are several laptop scan tools if you already have a laptop PC, I use DataMaster, its about $100 from http://www.akmcables.com/dss.htm

Or you can get a standalone scan tool lie a ScanMaster http://www.fullthrottlespeed.com/itemdesc~CartId~{AD2583FD-3E55-EVEREST457B-8629-216FA52AFC54}~ic~050SCANLT1~eq~~Tp~.htm

The laptop scan tool can record and playback. The Scanmaster only holds your highest and lowest readings.

Scan tool can display any sensor values that are input to the PCM...TPS, O2, IAC, IAT, timing, BLMs, INT, O2 cross-counts(tells you when the o2 is getting lazy)..and it goes on and on.

 

here is the one i have... i did some reading on it last night and it looks like it will test the o2's with the car running...


http://www.sjdiscounttools.com/actcp9180.html