How do I remove my front O2 sensor?
 

Help!!!!!!!!

Well if you have the right tool too remove the sensor and it is still stuck try using a small propane or oxyacetylene torch, you can also heat the edges of the bung on the exhaust pipe. This will expand the pipe and bung without greatly affecting the sensor. A little heat will go a long way when removing stubborn sensors.



Read more: The Best Ways to Remove an Oxygen Sensor | eHow.com http://www.ehow.com/way_5380534_ways...#ixzz16o4LR28p

The code it's showing says heater/O2 sensor. I tried to clear the code and it will not. I'm hoping to do that and run some Seafoam through it but the code will not clear.

If it keeps throwing the code, it has to be replaced. You can't clean the sensor. The front one gets plenty hot enough to cook off anything you could clean out of it. The front one is a real bitch to change too.

So no one knows how to remove the front O2 sensor? I really need some tips on how to get it out. Please help!!

If it's really stuck pull the CAT out of the car or put it on a hoist
If you have a sensor socket try that...if you don't and you are buying a new sensor anyway just cut off the wire and use a normal 6 point deep socket and an impact if you have one.

Soak the threads in penetrating oil will likely help

If that doesn't work then heat up the pipe around the sensor and give that a go

If it's the one in the header (and I'm pretty sure it is) jack your car up find the header (right in front of cat), it is on the top of it towards the back take an open end wrench break the bolt then loosen with your hand, unplug connection and install in reverse order. I just took mine off changing the header and it was really easy so I'm not sure why some say it's difficult. if you have too much trouble just take it to a shop any one should be able to do it. penetrating oil can help or if you have a breaker bar to slip over the wrench that can help, if not try and combine two wrenches to make a breaker it (Google it to see pics) be careful they can slip off each other I recommend gloves to avoid bashing knuckles.

I changed mine just for piece of mind but it was stuck good. The threads were wiped out and stuck in the header. I would turn and turn but it was not coming out. What a nightmare!!! After about an hour of turning back and fourth it eventually came out with the treads stripped clean.

I used a common 12 point closed end wrench and just undid the connection on top of the bell housing then threaded the wires through the wrench. There was very little room but enough to re seat the wrench and get it to turn a little.

The threads in the header needed to be tapped clean in order to put the new sensor in. I can remove it in 10 minutes now.

electrical connection, front 02
 

i know this thread is old but someone PLEASE RESPOND! i need to replace my front 02,i know where it is, i have an 02 sensor socket, i even have the new sensor. only problem is i cant find the electrical connection. i followed the wire as far as i could with my hand but i couldnt locate it. It seems to go up and past the transmission then vanish. Someone please help i really need this fixed

It is on the exhaust manifold.


https://cimg2.ibsrv.net/gimg/www.rx8...f67ddc9ec3.jpg

so where would be the best point for me to access the connection from? Also thank you for the prompt response

From the top, it connects behind the upper intake manifold.

by top you mean through the engine bay?

Yes. It's behind the oil filter.

the connectors pictured.


https://cimg3.ibsrv.net/gimg/www.rx8...8df0fb7909.jpg

Awesome thanks so much man, ive been trying to figure out the connection for a while! Really appreciate it

Hi sorry for restarting an old thread, new member so cant start posts for 30 days,

i have searched n searched n loooked around but cant seem to find how i could access the front o2 sensor..i roughly know where it is from the images but have not been able to spot it visually once in the car...

can someone pls 1 guide me with vids/pics where it is exactly on a car where the engine/manifold etc have not been dismantled 2 will i need to jack up my car to remove this or access/removal from top is possible...many thanks

It's on the exhaust manifold (as shown above) and if you can't find it, you have no business trying to remove it.

Your superior intelligence tells you that the picture is clear enough.. amazing...the world has come to see more n more jack asses like u... do u know it all mate .. do ya ...lol

Give me a pic where engine and manifold have not been removed from the car and then show me the location, else, you know how to sign out of this forum... don't you... top right .. click sign out ... but say your prayers before u do...lol

You won't get any help around here With an attitude like that.

The flange on the picture is where the CAT bolts on...so passenger side about where the engine tranny bolt together is where to look. You can see that bracket from below as well.

Can't really be clearer than that..

And can the attitude....you have been warned

Same goes for you... walk the talk first .. will ya....don't make derogatory comments while advising someone you believe has not got similar knowledge..u hv been cautioned.. this is a free public forum.. no one forced u to advise.. a nice request at the very start deserved a nice n polite advise.. now .. ..



Mod Edit... Guess he didn't notice that I was a Mod?

:lol:

The exhaust manifold is on the right side of the engine. Jack the car up and slide under the car. The A/F sensor is threaded into the top of the exhaust manifold. A 7/8' wrench fits on the hex pretty well and the a/f sensor should come right out. I've never had one stick on an 8. The connector is near the inspection plate on the rear iron. They can be tough to separate so be patient.

Next question is, have you run the car at normal operating temperature and observed the live data to see if the the sensor was responding properly? The A/F sensor should sit around 0.9V sometimes dropping to 0.8V, but commonly holding at 0.9V. Any less and its faulty. The downstream oxygen sensor should be reading around 3.3V and will fluctuate a couple tenths as the rpm's increase or decrease. An exhaust leak can throw off the sensor readings and cause a DTC for a fault sensor, so make sure you don't have any gross exhaust leaks.

Why would u need a pic of the said manifold on the car to find the sensor's location

Are u that retarded?

U seems like u are retarded, and when u are, dont fuck the car up, do human race a favor just sell it, u dont deserves it

LOL...you been asleep.... 😎 We were done bashing him

Lol!

Well i moved out of nyc, and ive been busy thats why ... hahah

the front o2 sensor is atop the transmission where the engine and transmission meet. you can access the harness from the top under the hood from the left side.

https://cimg3.ibsrv.net/gimg/www.rx8...116451253d.jpgrear l eft side under hood
https://cimg4.ibsrv.net/gimg/www.rx8...c8025ee7b0.jpgcloser
https://cimg8.ibsrv.net/gimg/www.rx8...bfaeabd2cd.jpgbehind (to the left) of the gray plug

:lol:

That's where the plug is...the O2 sensor is I'm the exhaust manifold ��

Not to mention that it was all covered earlier in the thread.

I almost hate to bring this one back after the earlier exchanges, but here goes anyway.

I need to change my front sensor on my '06. Have both the sensor and plug located just fine from all the info here - very well illustrated and my thanks for that. Plug will be tough 'cuz I have big clunky hands, but I'll likely remove some stuff to get in there - moving the A/C line may help and be enough as I saw elsewhere. The sensor is easy to get to since I have a lift in the garage and have it soaking with PB Blaster ahead of time.

Question I have is how do you get a wrench in there to loosen the old and then tighten the new sensor? I see there are two types of sockets, and I used the longer one a while back, when I swapped the rear sensor, but the shorter one is what I figure I need for this with the offset. Does anyone by chance have a pic of how the wrenches will configure in this space? I'll go rent the right socket when the new part arrives and I have plenty of ratchets, but want to have a better idea before I get too much further.

Thanks in advance for any help here!

Mike

Edit: I found this offset wrench on Amazon. Will this be the best tool for this job?

Update on progress: Moved the A/C line and got the plug easily that way. The socket won't budge the sensor at all, so I decided to just go ahead and start removing the whole manifold. Really taking my time with that, since I don't need the car right now. Broke one bolt on the lower mount bracket for the manifold and the bolts for the manifold to the CAT are pretty bad too. No big deal if those break. Soaking more with PB Blaster and giving it all time to sit so far.

The two bottom rear manifold bolts came loose pretty well so far and need to pull the front right wheel to get the engine mount bracket out, so I can get to the rest of the manifold bolts on top and bottom front. Once the unit is out, the sensor should be easier to finish off - then just reinstall everything to finish the job.

Have to admit that the start was ugly, but patience should get me through the rest.

Happy Thanksgiving everyone.

Just want to close this here. Appreciate the initial details given. For my case, I ended up having to pull the manifold to cleanly remove the sensor. The space was tight and the sensor was too stuck to get it to turn with any of the tools that I had to try. Here's the sequence:

Removed the motor mount on passenger side to help with access
Removed brace under the engine
Pulled the bolts from the manifold - they came off very well
Broke two of the bolts from manifold to cat so I had to get the studs out and get new bolts for that reinstallation - not a big deal there
The heat riser tube to the EGR valve was a pain to get out to remove the manifold as those nuts were rusted and I couldn't get socket over them to loosen. Cut the bolts off at the manifold and removed the other end up top to get the tube free
With help was able to maneuver the manifold out and remove the sensor
Got a tool to clean-up the threads on the sensor hole
Put it all back together and cleared the code with the OBD II reader.

All seems good now s far.