This post is assuming you have average mechanical knowledge. If you don't work on your own stuff, please skip this post. If you do your basic stuff, then read at your own risk. Its your bike you decide if you want to follow my advice.
DISCLAIMER - I'm not a harley tech and only have worked on my Sporty and Classic a couple times.
Now, do you have a FSM - Factory Service Manual? If you own a harley, this should be the first "option" you add. There will be more info than you need but it will save you money the first time you use it. You can get them on eBay for around 50 bucks.
If you don't own a manual, I found this link using a simple Google search. This link is to a HD forum.
http://www.harley-davidsonforums.com/forums/general-service-repair/4351-sportster-dtc-intsructions-codes.html