96k1500, 275k miles. Runs rich, poor mpg, gives codes for bad O2 sensors for at least 3 of the 4 sensors.

Looking at my O2 sensors today, I found them quite corroded. Probably OEM. I'm suspecting cats may be shot as well, given all 4 sensors are bad, and has run love this since I've owned it, probably 10k miles(don't know how long previous owners did either).

Thoughts? Afraid to try to remove them, might wreck exhaust pipe or the boss they are mounted in...

 

If you are replacing the cats along with the O2 sensors then you don't have to worry about removing them. If you want to remove them anyway, clean the corrosion off real good and soak them in Blaster first. Then go for it, you really have nothing to lose.