Ah. Yeah, you want it warm and it can't hurt to drop in a new O2 sensor. I find that in states where they use oxygenated gas, O2 sensors tend to fry every few years or get so out of whack that they barely work. A lot are cheap crud, too and just plain fail in a short time. This is why I just go out and get the $30 Bosch one at my local mom and pop auto parts store.
