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O2 sensor will not break free #4397932
05/06/17 05:09 PM
05/06/17 05:09 PM
Joined: Sep 2015
Posts: 527
Alabama
NavyVet88 Offline OP
NavyVet88  Offline OP
Joined: Sep 2015
Posts: 527
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.


2013 Honda Civic LX 1.8L 140k M1 HM 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A
Maintenance Mechanic by trade, working class for life.
Re: O2 sensor will not break free [Re: NavyVet88] #4397936
05/06/17 05:15 PM
05/06/17 05:15 PM
Joined: Apr 2016
Posts: 845
KS
FordBroncoVWJeta Offline
FordBroncoVWJeta  Offline
Joined: Apr 2016
Posts: 845
KS
Go get one of those little propane torches. Those work really good.


17 Volkswagen Jetta 1.4T
15 Honda CRV 2.4
12 Volkswagen Jetta 2.0
01 Pontiac Sunfire 2.2
Re: O2 sensor will not break free [Re: NavyVet88] #4397939
05/06/17 05:25 PM
05/06/17 05:25 PM
Joined: Nov 2006
Posts: 19,922
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,922
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: O2 sensor will not break free [Re: NavyVet88] #4397952
05/06/17 05:44 PM
05/06/17 05:44 PM
Joined: Dec 2014
Posts: 630
Toronto
dgunay Offline
dgunay  Offline
Joined: Dec 2014
Posts: 630
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 - PUP 0w20 / Fram XG7317 / Maxlife ATF
2018 Kawasaki Z650 - Motul 4T 5100 10w40 / OEM Oil Filter
Re: O2 sensor will not break free [Re: NavyVet88] #4397968
05/06/17 06:11 PM
05/06/17 06:11 PM
Joined: Sep 2015
Posts: 527
Alabama
NavyVet88 Offline OP
NavyVet88  Offline OP
Joined: Sep 2015
Posts: 527
Alabama
I think I will let the mechanic have this one before it becomes more of a headache


2013 Honda Civic LX 1.8L 140k M1 HM 0w20 with Fram XG7317
2003 Buick Century 3.1L 196k Maxlife 5W-30 with Fram TG3387A
Maintenance Mechanic by trade, working class for life.
Re: O2 sensor will not break free [Re: NavyVet88] #4397973
05/06/17 06:18 PM
05/06/17 06:18 PM
Joined: Jul 2011
Posts: 76
Woodbridge, NJ
Dadillac Offline
Dadillac  Offline
Joined: Jul 2011
Posts: 76
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

Re: O2 sensor will not break free [Re: NavyVet88] #4397985
05/06/17 06:49 PM
05/06/17 06:49 PM
Joined: Aug 2003
Posts: 10,782
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 10,782
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.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: O2 sensor will not break free [Re: NavyVet88] #4398014
05/06/17 07:37 PM
05/06/17 07:37 PM
Joined: Sep 2004
Posts: 7,529
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,529
Marshfield , MA
With great difficulty, I have used a box end. 7/8 on the one in the BMW. Saves the sensor


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: O2 sensor will not break free [Re: NavyVet88] #4398016
05/06/17 07:38 PM
05/06/17 07:38 PM
Joined: Aug 2008
Posts: 3,163
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,163
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

Re: O2 sensor will not break free [Re: NavyVet88] #4398043
05/06/17 08:30 PM
05/06/17 08:30 PM
Joined: Nov 2004
Posts: 7,753
Texas
GMBoy Offline
GMBoy  Offline
Joined: Nov 2004
Posts: 7,753
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

Re: O2 sensor will not break free [Re: NavyVet88] #4398063
05/06/17 08:50 PM
05/06/17 08:50 PM
Joined: Dec 2012
Posts: 361
PA
copcarguy Offline
copcarguy  Offline
Joined: Dec 2012
Posts: 361
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.

Re: O2 sensor will not break free [Re: NavyVet88] #4398081
05/06/17 09:18 PM
05/06/17 09:18 PM
Joined: Jun 2015
Posts: 490
New York
NoNameJoe Offline
NoNameJoe  Offline
Joined: Jun 2015
Posts: 490
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.


2015 Civic LX Coupe
Re: O2 sensor will not break free [Re: NavyVet88] #4398131
05/06/17 10:52 PM
05/06/17 10:52 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline
RichardS  Offline
Joined: Jan 2017
Posts: 632
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
Re: O2 sensor will not break free [Re: NavyVet88] #4398135
05/06/17 10:54 PM
05/06/17 10:54 PM
Joined: May 2010
Posts: 9,054
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,054
North Carolina
Impact wrench, a good one. When you get it out, use the the anti-seize that comes with the new sensor.


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: O2 sensor will not break free [Re: NavyVet88] #4398144
05/06/17 11:15 PM
05/06/17 11:15 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
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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