why are you trying to remove the sensor? is it tripping an O2 sensor code? even if there is a code for the O2 sensor, it could be just a dirty mass airflow sensor. try pulling that out and cleaning it with carb cleaner and reset the light (advance auto can do this) if the mass air sensor isnt reading properly, the air/fuel mixture will be off and that will be picked up in the exhaust by the O2 sensor which will trip the code
if there is another reason, let us know. otherwise find the biggest breaker bar you can find and put alot of ass into it, haha