That's a matter of opinion. Bad O2 sensors are hard on the cats but how hard and for how long you can run it/them before you do any significant damage is debatable. I'll agree with Greg here about replacing both pre-cat sensors as soon as practical.
That's a matter of opinion. Bad O2 sensors are hard on the cats but how hard and for how long you can run it/them before you do any significant damage is debatable. I'll agree with Greg here about replacing both pre-cat sensors as soon as practical....and should I act quickly or is some thing bad going to happen...