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#4397932 - 05/06/17 05:09 PM O2 sensor will not break free
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
Ok im trying to replace the bank 1 upper o2 sensor on my buick. It's the one located right next to the firewall and that sucker will not break free for anything. I have soaked it in pb blaster, heated it up by running the car down the road till it was heated up enough.

All I know to do at this point is put a torch to it and go from there hoping it will work. If you guys have any suggestions, I'm open to them.
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2013 Honda Civic LX 1.8L 127k M1 EP 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4397936 - 05/06/17 05:15 PM Re: O2 sensor will not break free [Re: NavyVet88]
FordBroncoVWJeta Offline


Registered: 04/16/16
Posts: 765
Loc: KS
Go get one of those little propane torches. Those work really good.
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#4397939 - 05/06/17 05:25 PM Re: O2 sensor will not break free [Re: NavyVet88]
Trav Offline


Registered: 11/20/06
Posts: 18829
Loc: MA, Mittelfranken.de
You need a very deep 6pt impact socket, impact wobble and extensions with an impact gun or long 1/2 breaker bar, this will require cutting the wire off. Propane isn't doing much anything for that, you could use a real smoke wrench on the bung first.
If its that tight don't use a split socket it can round it off then you have a real fiasco. If you don't have the tools and torches take it to a mechanic it will probably save you a lot of grief.
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#4397952 - 05/06/17 05:44 PM Re: O2 sensor will not break free [Re: NavyVet88]
dgunay Offline


Registered: 12/05/14
Posts: 607
Loc: Toronto
Originally Posted By: NavyVet88
Ok im trying to replace the bank 1 upper o2 sensor on my buick. It's the one located right next to the firewall and that sucker will not break free for anything. I have soaked it in pb blaster, heated it up by running the car down the road till it was heated up enough.

All I know to do at this point is put a torch to it and go from there hoping it will work. If you guys have any suggestions, I'm open to them.


Try it with a cheater bar first.

If it doesn't work, get a propane torch.
_________________________
2009 Acura CSX (K20Z2 Auto)
PUP 5w30 / M1-110 / Maxlife ATF
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#4397968 - 05/06/17 06:11 PM Re: O2 sensor will not break free [Re: NavyVet88]
NavyVet88 Offline


Registered: 09/27/15
Posts: 515
Loc: Alabama
I think I will let the mechanic have this one before it becomes more of a headache
_________________________
2013 Honda Civic LX 1.8L 127k M1 EP 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A

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#4397973 - 05/06/17 06:18 PM Re: O2 sensor will not break free [Re: NavyVet88]
Dadillac Offline


Registered: 07/31/11
Posts: 62
Loc: Woodbridge, NJ
I had an O2 that wouldn't budge. So I used an air hammer hitting it a few times. Came right out after that. If you have room try hitting it with a hammer, if you do not have an air hammer, down on the flat area.

Don

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#4397985 - 05/06/17 06:49 PM Re: O2 sensor will not break free [Re: NavyVet88]
JTK Offline


Registered: 08/14/03
Posts: 10559
Loc: Buffalo, NY
Agree with the above. Don't use a split socket or you'll round it. Been down that road. You'll really have to scrap the sensor by cutting the wire off, but a solid 6pt is the only way.
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2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)

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#4398014 - 05/06/17 07:37 PM Re: O2 sensor will not break free [Re: NavyVet88]
andyd Online   content


Registered: 09/25/04
Posts: 7127
Loc: Marshfield , MA
With great difficulty, I have used a box end. 7/8 on the one in the BMW. Saves the sensor
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1994 Ranger ,the Rat, 5w30 dino, STP filter

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#4398016 - 05/06/17 07:38 PM Re: O2 sensor will not break free [Re: NavyVet88]
Reddy45 Offline


Registered: 08/15/08
Posts: 2962
Loc: USA
For some reason these offset type wrenches work really well on stubborn O2 sensors. I guess the design basically multiplies the torque.

https://www.harborfreight.com/3-8-eighth-inch-offset-oxygen-sensor-wrench-97177.html

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#4398043 - 05/06/17 08:30 PM Re: O2 sensor will not break free [Re: NavyVet88]
GMBoy Offline


Registered: 11/22/04
Posts: 7701
Loc: Texas
This right here is ALL I WILL USE. It works EVERYTIME and grips tight and takes all you can give it. The other one's don't hold a candle to this.

https://www.walmart.com/ip/O2-Oxygen-Sen...13=&veh=sem

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#4398063 - 05/06/17 08:50 PM Re: O2 sensor will not break free [Re: NavyVet88]
copcarguy Offline


Registered: 12/06/12
Posts: 333
Loc: PA
I used a combination of a ratcheting wrench & offset wrench on the O2 socket. These gave additional torque rather than a ratchet.

You can also put a hose clamp over the end of the socket to prevent it from spreading under load.

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#4398081 - 05/06/17 09:18 PM Re: O2 sensor will not break free [Re: NavyVet88]
NoNameJoe Offline


Registered: 06/03/15
Posts: 414
Loc: New York
If you don't already have a torch I've had good luck with the Bernzomatic TS8000 with the yellow MAP/PRO fuel. I recommend the universal hose extension by the same company (well the parent "Worthington") to get into tight angles.

If you don't need the O2 sensor what other people said makes the most sense, just snip the wires off and use a deep socket with a good breaker bar (25in). But if you can't get it loose you'll be screwed since you snipped the wires off.

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#4398131 - 05/06/17 10:52 PM Re: O2 sensor will not break free [Re: NavyVet88]
RichardS Offline


Registered: 01/14/17
Posts: 616
Loc: Melbourne, Florida
Get an o2 socket from AZ, they're a loaner tool item.

Hit it with penetrating oil a few times, and let it sit over night.

Use a breaker bar on the wrench, and you should be able to get it out.

I did disconnect the vacuum line running from the rear of the motor to the master cylinder, that extra wiggle room was enough to negotiate around the bits I needed to get around to get it out of there.

I had a heck of a time getting that sensor out of mine, and the above is what finally got it free. I didn't heat it because I wanted to avoid potentially burning off the PB blaster I soaked it in the night before.
_________________________
2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG

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#4398135 - 05/06/17 10:54 PM Re: O2 sensor will not break free [Re: NavyVet88]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
Impact wrench, a good one. When you get it out, use the the anti-seize that comes with the new sensor.
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#4398144 - 05/06/17 11:15 PM Re: O2 sensor will not break free [Re: NavyVet88]
JHZR2 Offline



Registered: 12/14/02
Posts: 41758
Loc: New Jersey
Id do a heat and strike, heat and water quench, and heat and wax quench as options to get it out. After that I'd see if I could keep some permanent force on.

One car I put on ramps, then took my floor jack and finagled the ratchet to be constantly exerting force to loosen it. That actually worked well.

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