thats why u dont just replace sensors. Diagnos a problem b 4 u go swapping parts out.

Well sine your still getting the MIL there might a problem in your o2 wiring, ECU wiring, could be engine problems. I dont think itsd the cat or else you would get only the secondary O2 sensor CEL.

If any one you know has a GOOD scanner try and check LTFT (long turm fuel trim) . could be your running way to rich or Even LEAN and thst damaging the o2 sensor


but keeep it simple like mentioned above try RE-resetting it by removing the ECU fuse also leave it for a few mintues see what happens.


But im sure your problem is elsewhere post more info. gas mileage ect ect.




-Ernie