BTW: I used this part, and it made no difference for me, but whether or not the check engine light will come on is a different question. There is a light for the heat sensor in the cat, so i'd guess that the engine light won't come on for the 02 sensor. The consult software should tell me what the reading is on it.
Also, as mentioned a few times in this thread, the wire on the ROX207 cannot be soldered, you have to crimp.