ok well this is really really pi$$ing me off!!!!!!! my rear O2 sensor will not come out!!! i tried taking that little piece of exhaust off and the bolt broke off so i said F it and got my creasent wrench out to get the O2 out. i cant get it! it wont even budge!!! i have been sitting there soaking the ba$tard in PB blaster to no avail. Is there any tips anyone has for getting the F'er out? if not im gonna go soak it in pb blaster every 5 min. this makes me remember putting my testpipe on and the trouble i had with that.

 

Heat, and lots of it will make it come out like butter.

 

yeah i second that...hit it with a torch. You want to heat the exhaust, not the o2 sensor. heat=expansion. good luck

 

well i got it out and OMFG i thought it wasent supposed to make a differnce in performance but F that!!! it accelerates ALOT harder than before!!! hey maybe i should replace the front two huh lol they have 150K on them

 

Joos, you noticed a big difference in just the one O2 sensor? Now im definitely considering replacing all of mine. I was more than likely going to replace the o2 sensors when I replace my y pipe, but now my wheels are turning about swapping them out sooner.

 

I thought rear O2 basically checked to see if cat was working? Either way it shouldn't affect the car's performance in open loop.

Here's how I removed mine:

http://www.v6atlanta.com/pics/old_O2_sensor.jpg

 

omg dude LOL thats nuts, i sat there and used a 3/8" breaker bar with an O2 socket and a huge creasent wrench on the end of the breaker bar for more tourque while i had it on jackstands maxed out in front and back it looked so funny lol anyway yea the rear is usually only a monitor for the cat but mine went out and i got a code and then i went into safemode with the ecu so it suffered bad. it was really gradual so i didnt even notice the drop in performance or basic running of the engine until i put the new O2 sensor in. i let it sit at idle for 15 min after i reset the ECU and OMG, its like a brand new car and its sooooo much smoother it was nuts and i dont even have my new y pipe yet so now i cant wait for that!