Tips/tricks for removal of O2 sensors? Anti-seize won't help you one bit in removing them. If they're tough to extract, WD-40 or PB Blaster and tapping the threads works wonders. You don't *need* an O2 sensor socket, but it helps a lot, as it's more secure, and you can use a breaker bar if necessary (yours is a 12mm). But being only five years old, I wouldn't imagine they're too hard to break free. As nhrider1 said, don't mix the sensors up, but you pretty much have to mix them up on purpose in order to do that. Anti-seize the threads upon re-installation, and you're good to go.