Before you go replacing stuff and wasting money - Like I did - it may be something a bit more simpler. If you look at your engine bay where the filter box is, follow it up to the "accordian" section and folow that up to the intake. There is a silver section between the tube and the intake. Remove that whole section. On the intake there is a big hole that allows the air in. Below and to the left is a ridge. It should be clear. However, mine was so filled with carbon, I did not notice it was there. After cleaning it out, my problem was solved.
Check that first. These sensors are pretty expensive.