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Rick,
There is really no reason if all you want to do is get the codes. All the inexpensive units do is short the A and B terminals to have the codes flash. Here is a site the explains how to get the codes from your car: http://www.c4vettes.com/ecm.htm
The expensive tool you need is a paper clip or piece of wire. If you want to be able to monitor different aspects of the engine, then you may want to take a look at EASE software. Their site is http://www.obd2.com. I just received my EASE software and have not had a chance to play with it.
:cheers:
I agree with the paper clip method of retrieving codes. I have an AutoXray scanner that will allow you to read the sensor values and can be very useful for trouble shooting. It will take a snapshot, monitor real time or take a set of values over a short time period to catch an intermittant problem. It was $100 refurbished.
If you want to go beyond reading the codes only (paper clip method is best/free for that) you might also look around on eBay. Not long ago a guy auctioned an $180 (new price) AutoXray XP240 unit for 84 - 93 OBD-I GM and it went for like $60.