which one did you guys buy from ebay that works? i bought one that did not work 40 bucks down thw toilet!!!!!!!!!!!

 

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN%3AIT&rd=1

I bought the one above and the guy on eBay has a store so you can buy them at your leisure.

Works great on my Evo and diagnosed my P0300 as soon as I got it. As far as getting these things to work, just make sure that the key is in the "ON" position and not the "ACC". I made this mistake initially and my reader gave me an error. After I put the key in the "ON" position it worked great.