This might not be what you mean (I haven't done this repair myself, and are you really talking about a 2008? This is the Generation 1, 2001-3, forum) but I think I have seen other posts mentioning a circular metal sleeve that sticks up around the sensor preventing access with a normal wrench. If that's what you mean, a Google search for shielded oxygen sensor wrench ought to get you on track. Cheers, -Chap