Stripping O2 Sensor

Hey guys! So I'm working on B2S2 on the Jeep. I bought this: Amazon.com: OTC 6500 Flexi-Head O2 Sensor Wrench: Automotive

And I have an NTK sensor to install.

So first of all, the thing is stuck beyond belief. Second, the sensor is starting to strip. Is there anything that I might be doing wrong? Any words of advice to help?

Thanks guys!

I would recommend heating it with a torch

No use. Looks like it's just too stripped. Looks like she's going to the mechanic...

Break off the sensor and put a normal socket on it.

The local dealership stripped 3 of my O2 sensors taking them out and wanted to charge me to install a whole new exhaust system. Went down the road to an exhaust shop and had them weld over the holes and install new bungs right next to them. Cost me only $5 each plus they installed the 02 sensors I brought with me. Best $20 I ever spent.

rockymountain said:

Break off the sensor and put a normal socket on it.

Click to expand...

I'm thinking i might try this first. Although I have no idea where I would fit a socket and 3/8 inch wrench up there. O_O

Run the engine for 5-10mins then try and loosen it,wear long sleeves and heavy gloves as the exhaust will be hot.


If you can find one I'd highly recommend using a 7/8"(or 22mm) Snap On Flank Drive wrench and use the open end.

tjkj2002 said:

Run the engine for 5-10mins then try and loosen it,wear long sleeves and heavy gloves as the exhaust will be hot.


If you can find one I'd highly recommend using a 7/8"(or 22mm) Snap On Flank Drive wrench and use the open end.

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Didn't think of the open end of a wrench. I don't think I'm going to be able to get a Snap on but hopefully my dad has a craftsman sitting around. Probably not bent unfortunately.

I've changed all of mine out and did it like Troy mentioned.
Get it good and warm, and just use a wrench on them, twisted right out

dude1116 said:

Didn't think of the open end of a wrench. I don't think I'm going to be able to get a Snap on but hopefully my dad has a craftsman sitting around. Probably not bent unfortunately.

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Do not attempt with any open end wrench besides the Flank Drive wrench's from Snap On.All others will round off the O2 sensor.

tjkj2002 said:

Do not attempt with any open end wrench besides the Flank Drive wrench's from Snap On.All others will round off the O2 sensor.

Click to expand...

What's the difference besides the 15 degree bend in the shaft? (Giggity)

That tool's pricey as hell! But, of course, I will buy it if it really IS necessary...

SOEX28, Wrench, Combination, Standard Length, FLANK DRIVE® PLUS, 7/8", 12-Point

dude1116 said:

What's the difference besides the 15 degree bend in the shaft? (Giggity)

That tool's pricey as hell! But, of course, I will buy it if it really IS necessary...

SOEX28, Wrench, Combination, Standard Length, FLANK DRIVE® PLUS, 7/8", 12-Point

Click to expand...

The open end has specially placed "teeth" that bite into the fastener so it will not round off.





Flank Drive on top,regular on bottom.


I've had a 4' cheater pipe on my Flank Drive wrench's before and never rounded off what I was trying to loosen.I've completely deformed jams nuts(tie rod ends) that were seized before but never "rounded off" that jam nut.