How Would You Remove This Oxygen Sensor?

An alternative that comes with high risk of burning yourself, is to drive or run truck for a while and strike while still hit but great care must be taken as everything will be hot

 

strike hit with an air chisel?

 

Was meaning get under and use your wrenches while everything was still hot.
I will set up on ramps and lay out my tools, drive around for 20 minutes or so and pull back up on the ramps and start work immediately. Just remember when setting up to include a pair of thick leather gloves as everything is danger hot

 

Local shop wants to charge me $124 for labor...just to remove the old sensor and put the new one on. Guess I'll be doing it myself!

 

Honestly, $125 bucks isn't that bad. Especially considering you asked this questions 2 weeks ago, and it's still not done yet. I understand that a lot of people don't have the tools/workspace/resources on hand to tackle this, but if you did have everything you needed, you would have been able to do this already. If you have to buy something to complete this task, I'd suggest just paying the $125 and move on.

 

Knowing that the studs will probably be impossible to remove and at the end impossible to install a new O2 sensor, I'd probably just disconnect it (leave it in), and weld a new O2 bung right in front of it, at a maybe 20 degree shift. Replacement O2 sensors will have a flange threaded onto a standard thread that you can simply unscrew so you can thread the sensor into the bung

 

That’s a good deal IMO!

 

At a minimum, I'd want to buy a floor jack (dislike bottle jack), a file set and some anti-seize.

I like working on stuff. The reason it's taking so long is I have way too much going on in my life at the moment, and the Taco isn't my primary vehicle.

 

Then work on it a little at a time

 

what I did with mine is carefully cut the nuts in half with a dremel and split them open with a cold chisel (flat head screwdriver will do too).

Don't forget to put antiseize on the studs when you'll screw the new nuts back. They'll be much easier to remove next time

 

Upsteam and downstream sensors use identical hardware, correct?

 

Yes

 

Just spent my first hour under there with file set. There is no way I am filing the nut down to the point I can rip it off with pliers. I'm thinking maybe yours was more corroded than mine, or maybe my files are inferior to yours, or both?

So now I've destroyed one of the nuts. Time to plot next move.

 

Go spend the $125

 

This thread is like a traffic accident...I just can't stop looking and waiting for the next step!

 

Water and heat destroyed those nuts a long time ago, there's absolutely nothing you can do to make them worse.

Grind 'em off and replace the studs, like we suggested forever ago.

 

I'm saying I should have done the simplest thing first and just tried to beat on a smaller socket like @BroTaco8008 suggested. Yeah the photo in the OP looks bad, but probably there was enough of a nut left that I could have just unscrewed it with some elbow grease.

Nope, this is fun for me.