[gearbox]

wtf i tried and failed lol. it looks like the sensor is recessed inside the cat and cannot be taken out. regular tools would not work, neither does the special sensor wrench with offset socket and opening for wire to fit through. Im stuck? lol

[j182j]

If you are changing the sensor, just cut the wires off of it and use a deep socket in it.

[valenzuela]

yea since your replaceing it the good ol hammer always worked for me on stubborn o2 sensors

[sniperscout]

i believe the size is 22mm. what i did was I took a closed end 22mm wrench and dremeled a slot in it so you can get it over the wires. at this point i was able to get it on the sensor and take it out. I have a lot of spare wrenches laying around so i didnt care about cutting one. I dont recommend doing it to a good wrench though

[sl33pyriceboi]

are u talking about teh upper or lower one???

[Tragedy]

It must have rust/dirt settled in the threads. Use some bolt loosen/remover spray. Then use a breaker bar with the o2 sensor socket. It should come loose. The socket is big, and has a large slot on the side big enough for several wire sizes to fit through. I had to take off the heat shield first.

[gearbox]

but that special tool doesnt fit, its offset and hits the outer case of the cat where the wrench goes into it. the deep socket idea i see working, but yeah i would have to cut a slot in it for the wiring to put the new one on.

[Tragedy]

oh okay. Well the socket has to be deep. Here is a pic of the one I picked up from oreilly:





$11 next to the sockets and tools.

[gearbox]

thanks thats what i need! 22mm??

[sniperscout]

22 or 7/8 will work

[Tragedy]

Mine is universal.

[TRIZ]

Now that is a cool tool

[speedfoos]

I couldn't get mine out either gear and that was with the cat off the car. I ended up cutting it out because I didn't have the nifty socket. Well worth the money.

[gearbox]

thanks guys i got the 7/8 one deep socket with cutout. will try it tonight hopefully its not stuck too badly.

[Boilermaker1]

unbolt the heat shield surrounding the cat first. then try it. That shiny silver case comes off.