haha, this thread made me laugh (the midol part that is) dude I guarantee it is the o2 sensor, obviously it is a problem w/ it, b/c the code for it came on. whether or not it is on now or not, b/c I dont think the code will come on for it until the car is "warmed up", b/c at idle the o2 sensor isnt needed. just my .02, keep us informed..peace