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...

 

PB Balster works better than WD-40 ..... if it's rusted that bad, it might be a lost cause though ..... you have to make that call ...... for the cost of a can of penetrating oil, it could be worth a shot though .... good luck!!!!

 

i second the penetrating oil. it worked when i left my hitch in over winter and it rusted to the slot.