How to Remove and Replace Rusted on O2 Sensor

Just heat it red hot with a torch and quench it 2 or three times. It will come right out done

If its permanently welded , have an exhaust shop just weld a new O2 screw bung on and your good. Takes them 15 mins tops

Breaker bar make wonder... with brake fluid on the thread.

You only need a split socket for installing the new sensor. To remove the old one cut the wires and use a 22mm box end wrench or regular socket and breaker bar.

Best method is to heat it up then hit it with a ice cube makes the threads retract

Should have maybe started with a flare nut wrench...and the more-precise and tighter-fitting 22mm size vs 7/8" can work to your advantage too. Also...when you "hammer" on the wrench.....you will get more vibration/impact on the nut through a normal wrench....don't do it with a ratchet as 1.) it won't transmit the impact as well and 2.) hammering on the ratchet can damage the ratcheting mechanism if you want it to work for you again later.

Might have been easier to just take the entire catback out and do it while out of the car

Been waiting three years too chang all four on my 1996 mustang GT, west they came out easy thow had to use a stand under the exhaust and lift up on the cat a we bit just to get in on the oassangers side first one the back ones were easy had help had a lift easy easy you aren't doing it easy from the ground fk artahere that's why they charge so much by the crook meen book hourly I put a fuel pump in also drove 90miles to use a lift Sunday special well took toatal of four hours for both a pro done the tank for me. 🙏🏻 Better fuel pump some whould need to get the whole assembly not a pro light went out until about 20miles on the way home only code itsthrowing is for the purge valve box thingy for the air pollution all in all it never trew this code ever that I've had her now sunk plenty heater core radiator water pump intake manifold knew raceing clutch and cable all within the past two years id of sold it quick if I did not like my 96 GT raggtop especially when she's right now now I'm upside down so too speak investing so much to get he tip top next move paint I hopes barring nothing gets I'll on my stang for a while love my car old as it is still ruu you from the start bet I win first 3seconds off the line to hats when I back way off and watch stupid mfkers try and floor there's by then pounding it 😂 idiots zoom zoom zoom getting dark out think I'll go take he out for a spin if I were Ritchie I'd still keep her thow I'd have a couple outhers also has a 93fox body sole it in like 06 still grabbed 35000 becose I offed to a friend and bought a truck trighttn engine best Ford truck as long as you can do certain thing s like plugs your self or dealer Ford dealersomeone whom works on thease on the daily then you ask who moonlights theyll be some person at Ford dealer that will tune up for couple hundred b leave that n done right no come backs capesh 🤣😂😆 ya fk you can do pay a bonus so there in correctly every shade tree thinks it's easy there not to tight your fucked they'll blow a plug so fast then you can fix that also thow ole beast whould go down the road like it's been gelded like a dog no faster then fivety five or it feels stressed n nopower theres a good truck too make it sound smooth in a dead cylinder small block of wood seven cylinders Bet ya 💰thow its a dead clynder it will still run not up to form thow like it's got a missed plug and it's a strong engine

I had Stuck Sensor. I ran truck 15 mins hit with penetrating oil left truck running removed with open end wrench 22m. Out it came.

Haha I just broke that same socket trying to loosen the downstream sensor

Yes six point socket and having the sense enough to cut off the old one with a breaker bar will work every time 😂

2 minutes 😂😂😂 sawsaw and boxend 22 wrench done 😂😂😂😂😊

you made a right arse of that mate dont hit ratchets with hammers you bend the teeth and then they break .you put a spanner over the sensor and loisen that with a hammer.

So the mechanic tried to replace the O2 sensor and said it was welded to the manifold. Why would it be welded to the manifold, and does anyone have any idea how to deal with this please?

Excellent suggestion with the clamp over the split socket, so it won't separate while removing. ....The torque spec on my wife's Subaru for reinstalling a new sensor is 14ft/lbs. The stiff hand tightening is certainly enough.

Turned off after i see spray crap bro

you know that heat gun is silly. that absolutely did nothing. When people tell you to use heat, they mean an oxy/acetelyene torch and get the surrounding area cherry red.

The washers on O2 sensors are designed to provide a gas tight seal, penetrating oil can't reach the threads no matter how much you spray or how long its left. it may help if its still tight after a half turn loose but not before.

Always wear clean latex gloves if touching the tip of the sensor...it runs on 0.5 volts and the smallest contamination will not let it read right..your better off using a 22mm box end wrench than a socket to break it loose...

Thank god we are moving to electric cars. Don't have to deal with all these non sense.

...And that's all there is to it! LOL. Lots of work. I'm still trying to get mine out. It takes awhile. Good job. This takes persistence. Thanks for the video

get LIQUID WRENCH on it a.s.a.p.

Step one: buy a O2 socket. HF has them for $8.

Thank you so much for video. QUESTION: Is that Upstream or Downstream Oxygen sensor ?

I saw another video where someone used a hose clamp on the o2 socket to keep it from opening up.

I would cut mine off if I knew it made it this much easier to remove.

put a small radiator hose clamp on the socket to keep it from spreading or breaking. instead of a cumbersum c-clamp

This method has worked for me 90% of the time.

1.use a cold chisel to tap on the rusted nut and scrape off all loose rust.
2. Use a steel wire brush and make sure nut is clean

3. Spray liberally liquid wrench or pb blaster. Wait 30 minutes.

Using a claw type sensor socket give it a couple of good taps using an air hammer. If it begins to get loose use a breaker bar. If not heat up the nut and try again and again.

I have had a situation once or twice whete the bung came right off because the rust had eaten through the welding. You will need to reweld a new bung.

I'm trying to do the upstream sensor in the back on a bimmer. I bought a torch and I can't angle it as it just goes right out. I can't tilt it enough on the angle I need to heat it. No oils are working. This really sucks. Hard to reach and move around in there. I could take the whole dam car apart just to have the room I need.

I burned it with some cotton believe it or not and carefully so. It melted in part of the sensor. LOL. But not where I needed it too.

What kind of tool did you use to cut that? I need something really small just like that.

Time to attempt this on my 22 yr old 4runner that has lived its whole life outside in a very humid area.

Put a hose clamp around your socket

Great video, you kept your cool nicely. I go outta my mind when stuff goes south.

Anyone notice the cat smoking after using pb blaster I know that it maybe the cause from spraying it not sure if I should let my car run and let it burn off or not.

Thanks man you gave me an idea and it worked. Cut that bastard and get the socket and big Dewalt impact on it and out in a second.

22 mm is slightly smaller than 7/8 and is therefore less likely to round the nut. Use 22 mm if you can.

Hahaha

Mine has become rounded and I don't know what to do

that heat gun didn't do shit

liquid wrench every 2 days for a week, wrenched it off like a normal nut.

You are nutz Oil will not penetrate into threads

Use a breaker bar and it will came lose faster and with less effort

TU.. the most dreaded job in car repair. Penetrating oils only work on things that don't need penetrating oil. We fool ourselves by using them and is waste of money buy we fall for it every time and try. i had a stuck spark plug and spent two weeks spraying, and it never got on threads. had to use heat and punching torque.

Hose clamp not vise

Another good til is to put a hose clamp around the o2 sensor socket to prevent it from opening and slipping

Something that makes this even worse is many are in place with limited access you are upside down at odd angle can't see what you're doing (so doing the job basically blind) and it's stuck like hell like on here... Good tip is some kinda of lubricant let it set before you start....

Nice job. I'm looking at the threads and it doesn't look like any penetrating oil got on those threads, it was so tight. Is that correct?

haha lol all my attempts have failed.

A Good tip also is to give the sensor a good scrub with a wire brush before spraying it with penetrating oil, I use a wheel wire brush in a battery drill, works a treat

I've noticed that penetrating fluid seldom penetrates.

How about start the car to get it hot instead?