is your o2 sensor just hanging there? or is it inside a bung? and how many kms did you drive before it come on?mrpopnfresh said:Acidbdg, I hooked up the Mil Eliminator just like you said. It was working PERFECTLY, but just recently I through a cel again. I didn't check to see what it was, but I'm sure it's the O2 sensor. What should I do? Do I have to do it over again?