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Removing Oxygen Sensors #5456272 06/17/20 05:04 PM
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Propflux01 Offline OP
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What is the best way to remove these, on a bone cold engine, or heated engine? Reason I ask is I have heard both ways, and I have also heard of people breaking out the propane torch and heating it up. Thoughts? I have 4 to replace.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Removing Oxygen Sensors [Re: Propflux01] #5456276 06/17/20 05:15 PM
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OilReport99 Online Content
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Originally Posted by Propflux01
What is the best way to remove these, on a bone cold engine, or heated engine? Reason I ask is I have heard both ways, and I have also heard of people breaking out the propane torch and heating it up. Thoughts? I have 4 to replace.


It's not unusual to end up using the torch, they're "welded" to the pipes. If you're using a wrench, make it a six-point box end. Or a six point socket.

Last edited by OilReport99; 06/17/20 05:15 PM.

2018 Ram 1500 - VME 5W-20
Re: Removing Oxygen Sensors [Re: Propflux01] #5456304 06/17/20 05:35 PM
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JustN89 Offline
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I've never had to use anything more than a ratchet and an O2 socket. They can be picked up for under $12 usually, or most auto parts stores have a set that they will rent out. I could see where maybe you might use a breaker bar, but I've never had to do that. I don't think I'd take a torch to one.


You know what they say, cross threads are tighter than locktite!
Re: Removing Oxygen Sensors [Re: Propflux01] #5456305 06/17/20 05:37 PM
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Trav Offline
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Without knowing what you have for tools its hard to say, do you have an impact and O2 sockets?


ASE L1, Master. Deutsch Meisterbrief.
Re: Removing Oxygen Sensors [Re: JustN89] #5456308 06/17/20 05:38 PM
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Originally Posted by JustN89
I've never had to use anything more than a ratchet and an O2 socket. They can be picked up for under $12 usually, or most auto parts stores have a set that they will rent out. I could see where maybe you might use a breaker bar, but I've never had to do that. I don't think I'd take a torch to one.


Always used my Tekton O2 Socket, but I don't consider myself the norm.


2018 Ram 1500 - VME 5W-20
Re: Removing Oxygen Sensors [Re: Propflux01] #5456311 06/17/20 05:42 PM
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Dave9 Offline
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^ Or a purpose designed O2 sensor wrench with the cutout for the pigtail.

Re: Removing Oxygen Sensors [Re: Dave9] #5456313 06/17/20 05:42 PM
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Originally Posted by Dave9
^ Or a purpose designed O2 sensor wrench with the cutout for the pigtail.


+1


2018 Ram 1500 - VME 5W-20
Re: Removing Oxygen Sensors [Re: Propflux01] #5456315 06/17/20 05:44 PM
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t1snwrbrdr12 Offline
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If they don’t want to budge at all (depending on your strength and how much power is being lost from a swivel, extension, etc) I would suggest using heat. I typically try to have the exhaust hot or at least warm, then crack them loose and spray with penetrating oil immediately if they crack loose. Let cool down till it’s comfortable to work on. If they don’t budge, don’t try too hard, I have seen and pulled the threads out of the exhaust a few times by trying to be macho and force them out with more leverage. That’s way more of a headache than beating up the o2 bung around the sensor and having them come out smooth.

Re: Removing Oxygen Sensors [Re: Propflux01] #5456336 06/17/20 06:15 PM
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Propflux01 Offline OP
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I have all the tools. 3 sensor removers (one tall socket, the others a 3/8d and 1/2d offset O2 tool). And plenty of air tools, sockets, wrenches, BFH’s and breaker bars. I know 3 of them will probably come out ok, but there is always one that’s gotta be a female canine.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Removing Oxygen Sensors [Re: Propflux01] #5456351 06/17/20 06:51 PM
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Snagglefoot Offline
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I lost the battle on one I was trying to remove for more clearance. I don’t like how shallow the nut it is. It’s easy for an oxygen sensor wrench to slip off. Even an acetylene torch heat-up could not get it off. All the others I’ve done have come off with an overnight soak with liquid wrench. This one was 15 years old. It was planted. smile

Last edited by Snagglefoot; 06/17/20 06:56 PM.

If you want the job done right......do it yourself.
Re: Removing Oxygen Sensors [Re: Propflux01] #5456352 06/17/20 06:53 PM
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Trav Offline
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I have the best results with an offset socket in tight places with impact and extension if needed. I also use the Lisle 43900 with air hammer but I think it has been discontinued.


ASE L1, Master. Deutsch Meisterbrief.
Re: Removing Oxygen Sensors [Re: Propflux01] #5456367 06/17/20 07:17 PM
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eljefino Online Content
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I had a rough one so I used penetrant then ran a cold engine for a minute, just a minute, then it cracked loose.

The exhaust heated up faster than the sensor did.

I generally put a box- or open end end wrench on. At 7/8" the wrench is beefy enough it won't spread, and won't round off the hex.

Re: Removing Oxygen Sensors [Re: Propflux01] #5456396 06/17/20 08:03 PM
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WyrTwister Offline
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A flare nut wrench has a gap that you could get the wire through . How would that work ?


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Re: Removing Oxygen Sensors [Re: Propflux01] #5456407 06/17/20 08:41 PM
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spasm3 Offline
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I've used an endwrench. I had one that would not budge at all, i cut the wires and used impact.


13 elantra 84k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 19000 miles m1 0w30
Re: Removing Oxygen Sensors [Re: Propflux01] #5456475 06/17/20 11:10 PM
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NoNameJoe Offline
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I too have surprisingly never needed anything more than an O2 socket and a really long ratchet or breaker bar.

I've encountered harder to remove bolts in other places. I suspect the fact that it's a larger diameter makes it less dangerous feeling than a rusted smaller diameter where breakage is likely lol.

If you're buying an O2 socket make sure to get one:
1. With as thin a cutout as possible for the wire harness.
2. The cutout placed on the flat and not the corner or point.

Some sockets use really wide cutouts where the cutout may be large enough to remove a point or two of the six points, which causes you to lose some effort due to the missing points and under serious pressure those two halves of the socket can move away from each other just slightly enough to strip the six points on the O2 sensor.

Here's an example of one I would consider subpar:
https://www.harborfreight.com/78-in-Oxygen-Sensor-Socket-63702.html

Here's an example of one I consider great in comparison:
https://www.amazon.com/TEKTON-4929-8-Inch-Oxygen-Sensor/dp/B000NPUKIE


2015 Civic LX Coupe
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