i use an adjustable wrench and tap it with a hammer.
I used a 12" adjustable wrench. Worked fine for an O2 sensor with 90K on it. Like it was brand new.Thanks guys...I'm into day one of the install. I'm working on it after work for the rest of the week (gonna take my time). I've got the header bolts loose, but i'm having a hard time getting the O2 sensors loose/off. What works best? 22mm wrench? That's my biggest struggle so far. Ideas?