Personnaly I'd learn how to blink out any codes, if you haven't already. I normally do that first before doing anything else. Problems with lambda probe etc. would show up as a code.
http://www.sjmautotechnik.com/troubl...g/100ecuf.html
I use a 1.2w lamp instead of an LED, and a paper clip. It's pretty easy once you've done it once, if you know what I mean. It's very easy to learn.