O2 Sensor removal?

[nrmskate]

Well, my O2 sensor wire got cut-off, so basically, its useless.

I have an Old cat that has one in it from a honda, I wanna use it instead of spending the money to go get a new one.

But, its a bit rusted in the the cat, what are your suggestions to making this 100000x times easier?

I tried WD-40, No luck...