Same one, 90K miles. P0420 Cat code comes up every few days; I read it and erase it, then a few days later it lights up, seems like always at idle. Needs a new cat, no? Or will soon? I'd just ignore it, or fix it with a little piece of electrical tape over the MIL ;D but if any other code sets I wouldn't know about it. My life has been a constant parade of MILs (not MILFs ) lately.