Thanks. Yea I just wasn't sure if it was even possible that the cat would not be working one day, but seem to be working the next. Like I said, I already ordered the new cat, so if the code comes back, I'll probably just do the replacement. What kills me is that I just found out the cat is warantied to 80k miles, and I've got 82k (of course!). Seems like its too young for a bad cat, if it is dead I'll be wondering what went wrong but I guess that's pretty hard to determine...