Exactly.
That is what I was trying to tell him in the beginning. One is a regular ole O2 sensor and the other is an Air/Fuel sensor. They look alike, but they are different. If he replaced it with a run of the mill O2, he will still have the code. If he didn't reset the ECU, he may still have a CEL.
dfire9: Get the part number off the old one and post it up here. Derek can look it up and tell you which one it is and just replace that one and reset the ECU. Done.
More than likely you just replaced the wrong one or WITH the wrong one.
