Replaced my way way way overdue O2 sensors a couple days ago and have a couple tips to help out others needing to do the same.
I tried to muscle out with a breaker bar but the crow foot slipped over the nut and started to round off the nut so I switched to impact.
The back sensor required the use of the wobble extension or flex adapter.
I used the crow foot for removal but of course had to start and stop a couple times. Once broken free I switched to the straight socket and hand tools
Here's the straight socket with impact grade flex adapter.
I was able to fold up nearly the entire cord into the socket for install: I had to carefully guide the connector around the heat shield once per revolution but it was so much easier than dealing with the twisting cord.
This is the sensor socket kit I bought for dealing with O2 sensors also has the size for some temp sensors etc.
Has two different styles of crow foot one that works great with a hammer when you have room.
Digital torque wrench one of my favorite tools. 50 N·m is the correct torque.
I bought a 5/8 thread chaser to clean the threads before installing the new sensors and it conveniently fits inside one of the sockets from the sensor socket kit
My adapter bag: 1/4 3/8 1/2 impact flex and the two shorter wobble adapters. Also the chrome parts convert a wrench into a low profile ratchet.
Like I mentioned waaaaay overdue.
Oops don't like me forget to plug in the new sensor!
Hot dog! Success. Instant improved mpg! I never get over 23 highway just got 25 on a 5 mile test drive at 60mph.
I'll know tonight if it was a fluke; making a 70 mile drive tonight.