actually the O2 sensors at the local auto parts store cost around 300 bucks a pop. I can't possibly do this stuff myself because I'm away at college and I have no tools, I'm pretty much at the mercy of the Chrysler corporation. And the O2's going out does sound suspicious, I'm sure that there has been some kind of abuse because I bought this thing used and it wasn't in fantastic shape when I bought it. The boys at the chrysler dealer were young and I'm sure that they ran the used crossfires around in circles beating them up. Bottom line is that I'm not happy.