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E30 3-Series Oxygen Sensor Replacement

Pelican Technical Article:

E30 3-Series Oxygen Sensor Replacement

Jared Fenton


1 hour1 hr






13mm socket, ratchet, flatblade screwdriver, WD-40, O2 removal socket, large pair of vice-grips, torque wrench

Applicable Models:

BMW E30 3-Series (1984-93)

Parts Required:

Oxygen sensor

Performance Gain:

Helps restore the proper fuel/air mix so your BMW runs just right as opposed to too rich or too lean

Complementary Modification:

Replace the spark plugs
101 Performance Projects for Your BMW 3 Series

This article is one in a series that have been released in conjunction with Wayne's new book, 101 Performance Projects for Your BMW 3 Series. The book contains 272 pages of full color projects detailing everything from performance mods to timing the camshafts. With more than 650+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any 3 Series owner's collection. The book was released in August 2006, and is available for ordering now. See The Official Book Website for more details.

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Figure 13

In this tech article, we will discuss replacement of the oxygen sensor in 1984-91 E30 3 Series BMW cars. While this article displays replacement of the sensor on my 325is, it should be noted that this article applies to most other fuel injected BMW models as well.

Why replace your oxygen (or O2) sensor? It is an essential part of maintenance on your BMW. The O2 sensor is used to monitor the fuel-air mixture of the car and send vital information to the car’s on-board computer (OBC), which in turn adjusts the mixture and timing of the car. It does this by measuring the oxygen content of the exhaust. Over time, O2 sensors wear out, due to heat and carbon buildup from the exhaust. When the O2 sensor begins to wear out, you may notice the car runs a bit sluggish, fuel economy may be down, and in sometimes, it may cause an annoying intermittent surging idle problem, (as was the case on my car). Once I replaced the O2 sensor, I noticed a increase in gas mileage as well as a mid-range increase in power and drivability.

BMW recommends that the O2 sensor be replaced every 60,000 miles. This article is written with the home mechanic in mind. With a few tools and the correct parts, you will be able to replace the sensor yourself.

The first step of this article is to disconnect the battery. You will want to do this anytime you are working with electrical components. Plugging an electrical component into the electrical system with the battery connected can cause a voltage spike. Voltage spikes can destroy your OBC. That said, let’s begin.

Open the hood and look down on the passenger side of the engine, you will see the exhaust manifold. Now, if you follow this down a bit, you will see a small sensor threaded into the side of the manifold. This is what we are replacing (Figure 1).

You will want to locate the electrical connector that the O2 sensor plugs into. On my 325is, this is located under the panel shown in the photo, right behind the front passenger side shock tower. Look at the top near the shock mount. You will notice a small plastic clip, holding the connector under the panel (Figure 2). You will want to rotate this clip 90 degrees, so the pin on the side lines up with the indexed hole, then use a screwdriver to carefully push the sides of the clip in. Once you have the sides of the clip pushed in, it should simply drop through the panel (Figure 3). With the connector free, you will want to remove the wire harness from the two clips shown in this picture (Figure 4)

Once you have the connector free, you will notice it has a screw-type collar, as shown here in Figure 5. Unscrew this collar, and pull the O2 sensor plug out of the connector (Figure 6).

Next, you will want to remove the small heat shield around the O2 sensor, this simply pulls off (Figure 7 and Figure 8). Remove the wiring harness from the clip as well. Now you will see the nut around the O2 sensor.

With the engine cold, spray a good penetrant spray (such as WD40 or 3 in 1 oil) around the O2 sensor where it plugs into the manifold. This will prevent the sensor from stripping out the threads when removing it. Let the penetrant soak for a few hours before continuing. Now is a good time to grab a beer or fruit juice, depending on your taste, of course.

Once the spray has worked itself into the threads, it is time to remove it. There are some tools on the market such as this O2 sensor removal socket that will assist in the removal of the sensor, however I found there was not enough clearance to use it (Figure 9). I recommend using the O2 sensor removal socket whenever possible. In this instance, I used a large pair of vice-grips around the nut to loosen the sensor. Simply reach down into the engine bay, use the vice-grips around the sensor and give it a few strong tugs. It should loosen up. Be cautious to avoid stripping out the threads (Figure 10).

When the sensor is loose, remove the vice-grips, and thread out the sensor by hand. Once I removed my the old sensor, I noticed that there was some carbon buildup on the sensor face, indicating that the car had been running rich for a while (Figure 11). The new sensor should correct this problem.

Now that the old sensor has been removed, it’s a good idea to spray a little bit of the penetrant spray on the inside of the threads inside the exhaust manifold. This will clean up any rust and soot that may have built up. Usually a quick little spray and then a few wipes with a rag will suffice.

Look at the new sensor (Figure 12). You will see a protective plastic cap over the tip that fits into the exhaust manifold. This is the part that actually senses oxygen in the system. It is crucial that you keep this tip clean. You will also notice a bit of anti-seize compound on the side of the sensor’s threads. DO NOT allow any of this to get on the tip. It will damage the sensor (Figure 13 - shown with plastic protective cap).

Now remove the protective cap, and carefully thread it into the manifold, making sure not to get any of the anti-seize compound on the tip. Hand tighten the sensor until it stops. Use the vice-grips around the outside nut to tighten it. BMW recommends that the O2 sensor be torqued to 55ft/lbs., however since I cant fit a torque wrench on there, I got it as tight as I possibly could when cold, then re-tightened the sensor with the engine and exhaust hot. This should secure the sensor in place.

With the new sensor installed and tightened, place the protective heat shield back around the sensor, and clip the wire in place. Next, plug the sensor’s plug back into the connector above, slide the threaded collar around the outside and hand tighten.

Once the sensor is plugged into the connector, line up the securing clip under the panel behind the shock mount. Line up the pin, then rotate it 90 degrees for the boss to slide through the panel. Once it is through the panel, rotate the clip 90 degrees to lock it in place.

And that’s it, you’re done!

If anyone has any questions regarding installation feel free to email me at The Pelican Parts Message Center


This technical article is made possible solely through the support of Pelican Parts. If you like what you see here, then please visit our online BMW catalog and help support the collection and creating of new and informative technical articles like this one.

Comments and Suggestions:
Gwyllgi Comments: Hi there! I have e30 316i 1990 2 seat EU, but i cant locate my o2 sensor. Its not located as on these pictures in article. Can you help me? I have bad consumption 15l per 100km
July 1, 2017
  Followup from the Pelican Staff: I don't have info on non-US models. I opened a post in our forums. A Pelican community member may be able to answer your question. - Nick at Pelican Parts  
Seb Comments: My 86 325es accelerates normal when cold. Once warmed up the acceleration is choppy/low power Checked vaccum leaks and girl line leaks
Replaced fuel pump. Could it be a bad 0w sensor seeing the problem only exists once the car is warmed up?
January 13, 2016
  Followup from the Pelican Staff: It could be, or a different input. Have to checked fuel delivery and exhaust back pressure? Rule out mechanical items first. - Nick at Pelican Parts  
nick Comments: I have a 1985 321i, 2 door, 6 cylinder, 5 speed that was imported through Houston, TX to my home.
I found that the shop seemed to have jury-rigged a 3-wire O2 sensor to the exhaust. One white wire is piggy-backed connected to the gray with green stripped center wire on the diagnostic connected on top of the intake manifold. The other white wire is spliced into a green wire that heads into a wire loom on the firewall, the black wire is grounded to the frame.
I can't believe this came from BMW this way, was it to pass USA inspection?
September 16, 2015
  Followup from the Pelican Staff: Is it s US vehicle? If not, I don't have info for it so I can't confirm the wiring. It could be an add-on for us emissions or a shoddy repair. - Nick at Pelican Parts  
325i Comments: Hi pelican parts
I'm from south africa and just wanna say your thread is fantastic!
I have an e30 325i 1991.I get a vibration at idle when revving the car.I don't no what's going on,its from the centre of the car and you can feel it in the whole car.please advise.thanx in advance
April 16, 2015
  Followup from the Pelican Staff: Auto or manual? Remove the drive belt, if the vibration is still present, it may be a misfire or in the transmission. - Nick at Pelican Parts  
Niuciu Comments: must be cause i can smell petrol some times
November 5, 2014
  Followup from the Pelican Staff: Ok, then check into it. - Nick at Pelican Parts  
Niuciu Comments: hi my 325is 89/y. pulls well only up to 4.00rpm then its struggling going up like a turtle.
i have cleaned up the icv and maf sensor replaced distributor cab and stuck with it.
is this can have something to do with the oxygen sensor?
November 5, 2014
  Followup from the Pelican Staff: Maybe. However, I would think more of a fuel delivery or exhaust restriction issue. - Nick at Pelican Parts  
lukiluciano Comments: Hi,
My bmw 316i e30 gives me 350 km with 55 liters!!
Do you think it could be the O2 sensor?
July 24, 2014
  Followup from the Pelican Staff: Do you have an o2 sensor fault code? If not, unlikely. I would tart by checking the fuel trim and seeing how fuel control looks. - Nick at Pelican Parts  
Bob Comments: 1988 635csi E24. Have new sensor but need advice on install.Mounts on top of front of catalytic converter, hardly visible, yet alone there some secret BMW trick to getting at this O2 sensor? Thanks!!!
June 20, 2014
  Followup from the Pelican Staff: Use an oxygen sensor socket with a swivel adapter and a long extension. Once loose, unscrew by hand. - Nick at Pelican Parts  
RipJaws Comments: Hi Pleican parts, replaced my whole engine. Used old MAF sensor and o2 sensor. Car revs high on cold start cuts out over bumps in the road and hard starts when engine warm. Used another second hand o2 sensor which decreased idle on cold start but still have problems. Order new o2 sensor from you guys?
March 26, 2014
  Followup from the Pelican Staff: Sounds like a vacuum leak. I would check if the o2 sensor is working before replacing it. When warm, it will switch from 0 to 1 volt. - Nick at Pelican Parts  
derrick Comments: MY engine is making noise,the top is noisy,i am not sure because i removed the themostart.
February 13, 2014
  Followup from the Pelican Staff: Removing the thermostat will not make the engine tick. I would check the engine oil level and check engine oil pressure to start. - Nick at Pelican Parts  
chezzy Comments: Could it be the fuel pump by any chance?
February 13, 2014
  Followup from the Pelican Staff: Yes, that is possible. - Nick at Pelican Parts  
chezzy Comments: Its a e30 318i tho..
February 13, 2014
  Followup from the Pelican Staff: Thanks, got it. - Nick at Pelican Parts  
Chezzy Comments: Hi it possible that because my exhaust manifold is not properly on that that car cuts out after just started? It barely idles?
February 13, 2014
  Followup from the Pelican Staff: I would think not. I would check for what the vehicle is losing when the stall / rough idle occurs. - Nick at Pelican Parts  
Conrad Comments: 1999 BMW 528IT, s/n WBADP633XXBV61744.
Each exhaust manifold half has 1 Oxygens sensor. Are the oxygen sensor the same part number? Or are the wirs a different length.
Also is it recommended to replace the exhaust sensors after the catalytic converters or is this replacement unnecessary.
Please advise.
Thank you Conrad Bock.
February 7, 2014
  Followup from the Pelican Staff: The front sensors are the same part number. The rear sensors, although different from the front, share a part number with each other. If replacing two, you might as well replace all four.- Nick at Pelican Parts  
EAP Comments: I have a '89 e30 325i with intermittent no startcranks over but will not stay on Seems to only happen when its been driven and warmed up. Has ALWAYS started when cold or been sitting overnight. Also random loss of throttle on the road. Feels like i just took my foot off the accelerator Making it so i have to pull over let it cool off enough so its willing to start up again. Sometimes it starts right back up sometimes not. I'm suspecting the o2 sensor. What else could it be? I'm going to replace the fuel pump relay, and main relay. Was also considering the ignition switch as the problem... Please help!
August 29, 2013
  Followup from the Pelican Staff: If your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume and quality. Once you figure out what is missing, it will be easier to diagnose. The o2 sensor would not cause a problem like that.
- Nick at Pelican Parts
Andres Comments: On my 1991 318is I can't locate my upstream 02 sensor, did some models not come with one? I have fault code 1222 and wanted to replace my o2 sensor to try and correct it but I can only locate the downstream one underneath the car, should I bother replacing the downstream one?
August 23, 2013
  Followup from the Pelican Staff: The downstream one is the only one you have. Upstream and downstream o2 sensors didn't start to about 1996 due to OBD II regulations. - Kerry at Pelican Parts  
Moe Comments: Ray@Pelican parts, I have heat coming from all vents inside my 1983 Mercedes 300SD and the heater is not turned on. Ican turn on the A/C and the cold air come on but, the heat still come through the vents at the samr time. Whats wrong? What do I need Ray? Thanks
June 4, 2013
  Followup from the Pelican Staff: First, check your owner manual to be sure you have the vents selected correctly. If you have the A/C on, and heat comes out of half the dash and A/C out of the other, this could indicate a low refrigerant charge. - Nick at Pelican Parts  
mike Comments: hey guys i replaced my o2 sensor very easy and afterward my check engine light came on saying something about o2 senosr control. does anyone know anything about that
December 23, 2012
  Followup from the Pelican Staff: What fault code was stored? What is your vehicle? A number of things can cause an oxygen sensor fault code. - Nick at Pelican Parts  
bob hope Comments: If you have a 1986 325es you have to get under the car and the sensor is right there.
November 20, 2012
  Followup from the Pelican Staff: Thanks for helping out a fellow member - Nick at Pelican Parts  
kbana Comments: Hi guys, I just replaced my sensor & the old one unscrewed like a dream. Disclaimer; this worked for me, I take no responsibility for the advice. I drove the car for an hour & ensured that the exhaust was very hot. I prepared with eye protection & thick gloves, I then used a shifter to remove the old sensor, a light tug is all it took. Mind you I did try removing the sensor cold, but it wouldn't budge. So the trick which worked for me is to replace the sensor when exhaust is very hot, but protect yourself & be careful. Best of luck in your DIY
July 20, 2012
  Followup from the Pelican Staff: Yes heat does make the metal softer and easier to remove. Avoid using rust penetrate sprays because they have silicone in them and this will damage the sensor element. - Nick at Pelican Parts  
RYANbmw Comments: I have a BMW 330ci convertible, it recently went for mot and it failed on the lambda sensor but im not sure what one it is before the cat, or after the cat any help would be great thanks
July 18, 2012
  Followup from the Pelican Staff: The oxygen sensors mounted close to engine, in the exhaust manifold are pre-catalyst. The oxygen sensors underneath the vehicle, behind catalytic converter are post-catalyst - Nick at Pelican Parts  
kbana Comments: Out of curiosity, since metal expands when heated, why not simply remove the sensor just after a drive when the exhaust is hot. Yes you may burn yourself, but that's what gloves are for.
Will this work better? - I am about to attempt a sensor replacement after ordering one from Pelican Parts :
July 11, 2012
  Followup from the Pelican Staff: The sensor will expand in the hole as well as the mounting bung. Best to do it cold to protect the threads in the bung and yourself. - Nick at Pelican Parts  
mym3 Comments: I have e30 m3. This is second time i have changed O2 sensor.I use a 7/8 wrench i cut in half.You can use either end open or box.Just use some muscle or small pry bar
May 6, 2012
  Followup from the Pelican Staff: Also use a 6 point wrench and not a 12 point because it is easier to round off the sensor with a 12 point wrench. - Nick at Pelican Parts  
fairly intelligent person Comments: Use a torch to heat the bung the o2 sensor threads into if you are having difficulty removing it....I.E. it is seized.....don't be a jerk & put visegrips on it...use a 22mm wrench or the appropriate tool if you want to avoid a mechanic....anyways don't drive a bmw if you cannot afford to maintain it in the 1st a kia
February 4, 2012
  Followup from the Pelican Staff: Thanks for the tip - Nick at Pelican Parts  
Ray Comments: my bmw 316i 1997 model started to raise idling to 1 on the the rave counter sometimes even more than 1 .ln the mornings when its cold l start it and it just turn off until when the engine is warm what could be the problem?
December 5, 2011
  Followup from the Pelican Staff: Yes, your idle speed motor is not properly controlling the idle speed when the car is cold and should be repaired. - Nick at Pelican Parts  
Gabe Comments: i just ordered an O2 sensor for my 95 318is from the local autozone. looking at the picture, i think that it only has two wires, whilst mine has four. will i be able to use the two-wire sensor, or will i have to return it for a four-wire one?
December 2, 2011
  Followup from the Pelican Staff: The four wire ones have a pre-heater in them. If you use the two-wire one instead, you will probably trigger errors by the computer as it will think the heater circuit is dead. - Wayne at Pelican Parts  
AsianSpanker Comments: I really like it when Jared takes the time to post pictures of the subject! It shows that one extra bit of effort that makes him the go-to guy at Pelican. Whenever we see or hear something we don't like as customers we are never shy about complaining. Well, lets not be shy when we see someone put in a bit more effort! Hat's off to Jared for the the effort. I am sure Wayne will remember that when he gives raises!
September 6, 2011
  Followup from the Pelican Staff: Jared appreciates the kind words - Nick at Pelican Parts  
ozzzo Comments: I can't believe you are telling people to use vice-grips to remove the oxygen sensor. That is bad advice, because a non-zero number of people will read that, and then strip it so that a wrench won't fit, and after it strips they will tighten up the vice-grips until they crush it, and then it will never come out and they will replace the exhaust manifold. Vice-grips can turn this 15-minute job into a multi-day project. Please don't ever put vice-grips on any nut or bolt unless it is already hopelessly stripped.

Here is the correct solution if you don't have the special socket, or it doesn't fit. Unplug the sensor wire. Run the wire through the hole of an open-end wrench, and then fit the wrench over the sensor and remove it. If you can't turn the wrench, get a longer one, or hook another wrench on the end for leverage do not try this with cheap wrenches because they may break.
July 3, 2011
  Followup from the Pelican Staff: Thanks for that pleasant reminder. Use the proper tools first before resorting to any last ditched efforts - Nick at Pelican Parts  
redtwin Comments: Hi, can someone tell me the O2 sensor wiring detail. My connector got ripped out and am hard wiring the sensor to the 4 cables. but the wire colors at the sensor end is different from the car end of the cable. Which color cables at the sensor end go to which colors at the other end?
October 26, 2010
  Followup from the Pelican Staff: There should be two wires for the heater and two wires for the signal. I don't think those are polarized, so you can swap the two wires to the heater and the two to the sensor without any ill effects. But you have to have the right wires going to the right components (heater or sensor). You can use a multi-tester and see if you can find a voltage going to the heater, that should give you a hint. - Wayne at Pelican Parts  
alex Comments: i replaced my O2 sensor today and i don't really notice any difference. my car has been kind of sputtering, sluggish, and has low rpm speeds.

since it was rather difficult to get the O2 sensor in to it's proper place, i might have gotten some of the compound on it. is it worth me taking off and cleaning it with something? and if so, how should i clean it?
October 23, 2010
  Followup from the Pelican Staff: If replacing the O2 sensor really didn't help, then it's most likely not the problem. I doubt that you could have gotten too much of the anti-seize on the sensor cover. - Wayne at Pelican Parts  
rikarena Comments: MY 1990 750il. speed don't encrace when I step on gas pedal
June 22, 2010
  Followup from the Pelican Staff: I would pull the codes and see what the engine is telling you: - Wayne at Pelican Parts  
pure n cool Comments: this happens at around 30 kph and goes away once i accelerate.
June 8, 2010
  Followup from the Pelican Staff: I assume because you are in the O2 sensor forum you are talking about a check engine light on with O2 sensor code that goes away under acceleration. Does the O2 sensor have 4 wires? That means it has a heater built into it. O2 sensors work best when they are hot and exhaust heats them up. At idle they can cool down so the heater is supposed to keep it hot. Make sure your heater circuit has the power and ground it needs to work. - Nick at Pelican Parts  
Pure n cool Comments: I have a automatic 320iE30, I keep getting a slight shudder from the back but there does not appear to be anything wrong with the diff. Any ideas on what could be wrong??
June 8, 2010
  Followup from the Pelican Staff: Tough to say - that's nearly impossible to diagnose over the Internet. - Wayne at Pelican Parts  
Egnaledknarf Comments: The socket in picture 9 is not a lambda/O2 sensor socket... it is a shock absorber or spindle joint removal socket. The opening in the side is there to allow access to the hex/torx on top of the shock absorber or spindle joint. A lambda/O2 sensor socket has an opening all the way down to the bottom so the cable can remain attached. A picture of a real deep lambda/O2 socket is attached.
May 27, 2010
  Followup from the Pelican Staff: I've used both to remove O2 sensors - just different ways to slice the bread. On most O2 sensors, the connector will fit through the hole in the tool listed in the article. On some cars it won't. Most times a 22mm open wrench will work fine too, depending upon access. - Wayne at Pelican Parts  
Randy Comments: I have a 325i Convertible that was manufactured in 12/86, so my oxygen sensor is slightly different from the one in your example plug in verses screw on with threads. Figures 5,6 & 12. Any words of wisdom getting the old one unplugged because I'm having some difficulty and I don't want to break it.
March 9, 2010
  Followup from the Pelican Staff: You may have the older design plug so look for the locking tab and push on it while you are trying to separate the connector. - Nick at Pelican Parts  
qtyson Comments: Honestly, I'm having a hard time finding the Bank 1 & 2 sensor 1's-o2 sensors on my 98 528i. The pics are good but a little confusing from certain points of view. Close-up great but medium shots to close-ups would do a lot more good. Because my 528i ain't easy looking like a 3 series.
January 1, 2010
  Followup from the Pelican Staff: The Bank 1 sensor is in the exhaust manifold for the 1, 2 and 3 cylinders and the Bank 2 sensor is in the exhaust manifold for the 4, 5 and 6 cylinders - Nick at Pelican Parts  
steve Comments: I need to replace the oxygen sensors on my BMW 33i conv. Which sensors do I need? The ones for before or after the catalytic converter and how many doI need?
December 24, 2009
  Followup from the Pelican Staff: It depends on the codes you have. If you have codes for the pre-O2 sensors then replace the ones before the cats. Remember just because you have an O2 sensor code does not mean the O2 sensors are bad. Vacuum leak, low fuel pressure and dirty MAFs can cause these codes. - Nick at Pelican Parts  
Adi B Comments: Hi, I have a 328i conv. 1997 and with my code reader I got two codes E9.Catalyst efficiency below threshold Cyl #1-3 and EA.Catalyst efficiency below threshold Cyl #4-6. I was able to reset the alarm with the Reset Tool Face. What shoud I do next to prevent any damages in the future ?.could you help me thanks
October 2, 2009
  Followup from the Pelican Staff: It may be that your secondary (behind the cat) O2 sensors need replacing, or your catalytic converters need to be replaced. Now that you have reset the codes, I would keep an eye on it and see if they reappear. - Wayne at Pelican Parts  
tell Comments: when engine is cold will start but within 20 seconds it will flood with petrol and will run as if it was firing on 2 cylinders and will cut out and will not start take pulgs out dry them and fire the car up when starts runs really rich and lumpie and reving it until it clear it felt if choke was out and is getting to much fuel once engine is warm it is ok any suggestions? would it be the 02 sensor

September 2, 2009
  Followup from the Pelican Staff: If that is happening, then it sounds like you have a clogged injector. The car should never flood with gas under any circumstance, unless the injectors are clogged and stuck open. - Wayne at Pelican Parts  
jonathand Comments: hi, I'm driving e30 320i 89 model black bumper and i am battling to sort out my cold start problem. i bought two new sensors the coolant sensor blue one and the grey one and did fit on my thermostat housing. when i start and both attached it takes ages to start but if i unplug the blue one it starts immediately. i then bought two of the blue plugs still has a problem..any suggestion you might have.
August 23, 2009
  Followup from the Pelican Staff: Hmm, I would check the sensors for the proper values and also check the wire harness. Sorry, it's difficult to diagnose things from afar. - Wayne at Pelican Parts  
Diehard Comments: hi, i am driving a 320i E30 and i am trying to locate my oxygen sensor but cannot find it..i checked on my exhaust and i cant find it..pls help
August 23, 2009
  Followup from the Pelican Staff: Hi there. The O2 sensor wasn't used on all cars, some Euro models didn't use one. I suspect that your car may be one of those? - Wayne at Pelican Parts  
Tim Comments: i just got mine out... been attempting for months, finally did it right. You have to put the PB Blaster penetrant on it quite thoroughly and let it sit for a few hours. I then put more on and waited another hour, then I was golden. A pair of vice grips and some muscle and it slowly unscrewed. Good luck!
August 14, 2009
  Followup from the Pelican Staff: Try to avoid using vice grips if you can also only use penetrating oil if you are replacing the sensors and do not put any on the new sensors. This will damage the new sensor since there is silicone in the spray. - Nick at Pelican Parts  
von Comments: how do you removed it if it's ceased on there? I can't get mine off.
May 9, 2009
  Followup from the Pelican Staff: If you are replacing them use penetration oil for a few hours. If you know how to use a plumbers torch you can heat the O2 sensor bung (the threaded part welded to the exhaust that the O2 sensor threads into) and they try removing it but please use protective clothing and safety goggles. - Nick at Pelican Parts  

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