I use the OTC-4000Enhanced.
http://tools.batauto.com/index.php?c...on=show_detail
I also use the BDM combo scope/scanner.
It's around $2K.
http://www.bsecorp.com/diagnostic/diagnostic1.html
I also use an older Snap-On MT2500 scanner.
http://cgi.ebay.com/ws/eBayISAPI.dll...tegory=42 291
You may want to consider finding a tech who has invested several thousand in diagnostic tools and training, rather than fumble with a $200 generic code reader.