O2 Oxygen Sensors?
 

Okay, So recently I discovered that my MAF sensor needed to be replaced, I discovered so by disconnecting the MAF and feeling such a difference within the feel of the X that I honestly did not even imagine a sensor could create.

Now that I am replacing my MAF I was wondering if changing my O2 sensors (Oxygen Sensors) would do any good for the X? Would I feel any difference? The X is an 01, 4.4i with 122k.

and if so, how much would you expect replacing the O2 Sensors would cost at a very good indy ?

Thanks!

If your not getting a CEL i wouldn't worry about it for now. I changed mine and didn't notice any difference I got the OEM Bosch and the pre cat is about 72 bucks I think? Post was 90 or the other way around, but whatever its not cheap. You can do this yourself its not hard at all, just spray the area with PVC blaster to loosen where the sensors screw on and then you can remove easier!

DIY. It's so easy to replace takes 5 mins.:thumbup::iagree::cool:

My wife also agrees, she can even do it....

Is it really that simple? Can someone point me towards a D.I.Y post please? I always figured the O2 Sensors were hard replace for some reason.

Oxygen Sensor Replacement DIY | O2 Sensor - Bimmerforums - The Ultimate BMW Forum

Try this, it's pretty much the same.

A bad O2 sensor will trigger a engine light warning on your dash and you will also notice a rich smelling exhaust (although I heard it can also cause a lean burn as well).
Anyway it was a royal pain in the azz on one of my M3's.

Agree, super easy to replace. I found them cheap online, searched on the forum and went to a site recommended by another member. Was around a $100 for both as I recall.

Found the link for the O2 sensor and they are $73 each. Bosch Before Catalytic Converter Oxygen Sensor Direct OE Replacement, 4-wire, Heated

This tool would help. HTTP://www.bavauto.com/shop.asp
When I went to change mine, they were so loose I removed them with no tool, just by hand.

Initially I felt better throttle response after installing the new o2 sensors.

The sensors have a suggested replacement of 100,000 which you are over.

This was totally wrong!!! How were you able to remove (oxygen sensors) located at the catalyst muffler by hand without using tools....
However I'm struggling with mine to replace, I was finally able to change one yesterday but the other one @ the front by the passenger side seems to be hell welded to the muffler. And I'm having big difficulty to get access to this one to remove it. Now the O2 sensor head become a little loose and wont come out easily, even after using 3 differents spray to loosen the part.

I just stated my experience when I did this. My X has only been in Florida and California and I have zero rust. My O2 sensors were oddly loose, as I stated I needed no tools to remove. Sorry you are having so much trouble.

Let me tell you what I did, PB Blaster when i came home from work let it sit over nite, next day repeat, then the third day after car was driven and warm sprayed and sit for a few more hours, took a 7/8" open wrench or 22mm i believe and you can open it. If you spray it once and expect it to come out, it may be hard, you need to give it some soaking and some capillary action to work. No need to buy special oxygen tool, i did this for the passenger side pre cat...and post cat I had to remove that rubber cylinder with two bolts holding it to get access.

Wow you must be lucky my friend by having your O2 sensors removed easily by hand like that!!! However my (2001 X5) is not rusty neither it's in pretty good shape everywhere...But the fact that I've already used unrelated tool to remove it, so this caused the head sensor now becomes a little loose to have a good torque on it.
I think oxygen sensors are not too hard work to replace, it just the access that seems to be hell to get near by. Right now, I'm using the special oxygen tool device to remove it and this is how I was able to replace the driver front side O2 sensor less than 5mtes. So now I m gonna try your idea like you did for yours and see what's-up.

Big Thanks 4 great foks like you who keeps posting/sharing some personals works done to the forum. And this is how I'm able now to service my (2001 X5 4.4i). So far I've already saved thousands of dollars by doing (oil change, Brake pads/sensors replacement), (spark plug replacement), (Air filter replacement), some electronics devices that were not working like troubleshooting: fuse for (self level susp inact) + cigarette lighter fuse were blown out, I fixed them all by myself!!! Now I'm working on my O2 sensors...