So I have my rear O2's programmed out of the loop due to the O/R pipe. Maybe this is a silly question, but recently one of my front O2's decided to throw a trouble code. Of course I could and should replace the front sensors, but for the sake of my check book, can I simply swap the ones in the front with the ones in the rear? Seeing as how there being a bad rear one makes no matter to the computer, or are the fronts and rears fundamentally different?