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Message: <blockquote data-quote="OptimistPrime" data-source="post: 360417" data-attributes="member: 44207">Okay, think I might have this problem sewed up. I drove the car long enough to get it in the trouble state, then examined the cat. No redness that I could see. I located the O2 sensor but didn't have a big enough wrench to get it off. I think it's like a 23mm? I also couldn't find the fuse for it on the panel. So, I just unplugged the O2 sensor pigtail and left the sensor in place. I went and drove the car about 80 miles. 20 on surface streets and 60 around that loop road. Full throttle the whole way, too. I waited until dark so traffic would be lighter. The car drove great, except for the check engine light being on. Previously the car had driven well for about 30 miles, lousy for 30 miles after that, and then it would finally hit the wall after 60 or so miles. I crossed my fingers that the thing wouldn't crap out on me 30+ miles from home. As I got past the half way point, I pressed the car harder and harder. She ran like a top the whole time.Is it possible the O2 sensor was the culprit? I've heard of a bad one causing the car to run like crap, but never something like this. Still, 80 miles of driving is the farthest I've had it out without the problem hitting me, so I'm inclined to say something is working right.</blockquote>