1996 850 NA Replace Front Oxygen Sensor P0133

PeteB · Post by **PeteB** » 17 Oct 2022, 12:42

Got the P0133 code, along with louder exhaust, some say that an exhaust leak can set this code.
Odd, the loud exhaust issue went away since the first time that I looked at it about a month ago,
cleared the code, guessing that it will come back.

Robert DIY shows how to do it here, he uses a slotted O2 sensor socket:

Had the car up on ramps so shot the front O2 sensor with PBlaster and WD40, let it soak in.
I have an O2 socket that is similar to the one that Robert uses but it is Autocraft brand and looks
more like cast iron than steel. It says 7/8" (22mm) on it. It went on all the way, and then when I
used a braker bar on it, it slipped and turned. I seem to remember clamping it tighter with vice
grips the last time that I used it in a spot with enough room. There's not enough room here.
OK, so the nut surface is slightly rounded now. I guess that the thing to do is to get a better
socket and try again. I suppose that a last resort would be to use vice grips on it.

It looks like the Autocraft socket just opened up a bit, I'd avoid this brand in the future.

Suggestions? I could try heat of course but we only have a propane torch.

PeteB · Post by **PeteB** » 17 Oct 2022, 15:09

Got a close look at it and it seems that the socket expanded and didn't damage the nut much at all.
I ordered a hopefully better socket and will give it a try with heat.
I do have an open end wrench that held tight but was unable to break it - the new socket is probably
a better bet.

It takes the PBlaster well, looks like it gets sucked right into the threads, but of course has not freed it.

Post by **Sveedy** » 17 Oct 2022, 16:32

Maybe a pipe wrench ?

Post by **kallekula** » 17 Oct 2022, 17:55

I had the same problem a while back. The tool is not sturdy enough and finally just opens up and spin. Think I just bought a new one from Autozone. Worked like a charm.

Post by **abscate** » 17 Oct 2022, 18:12

Heat the snot out of it with propane for 60 seconds, let cool for 10 minutes while you do something else

Repeat

Repeat

Post by **abscate** » 18 Oct 2022, 04:30

I’ve got a couple of these tools if you want to meet on Route 8 somewhere and borrow.

I want to say my black oxide complete 22mm with a breaker bar is the best one I have for this job

Post by **jreed** » 18 Oct 2022, 05:24

I bought a Tekton socket last year in January (2021), and that worked great -- did not open up or spread noticeably while removing the old O2 sensor. It was a TEKTON 3/8 Inch Drive x 7/8 Inch Offset 6-Point Oxygen Sensor Socket, part number 47749. Only cost $8 at that time, now $11 in Oct 2022.

Post by **Chuck W** » 18 Oct 2022, 06:17

I've used a hose clamp on O2 sensor tools, to help keep them from spreading apart for really stubborn sensors.

PeteB · Post by **PeteB** » 18 Oct 2022, 11:06

abscate wrote: ↑18 Oct 2022, 04:30 I’ve got a couple of these tools if you want to meet on Route 8 somewhere and borrow.

I want to say my black oxide complete 22mm with a breaker bar is the best one I have for this job

Thanks, I have another socket on the way, and will try the heat first then this socket and will let you know if I need to borrow one.

Thanks again.
I have some doors for you by the way, do you still have space to store them?

PeteB · Post by **PeteB** » 22 Oct 2022, 17:28

Went to buy the O2 sensor from FCP and this one is listed as the correct one:
https://www.fcpeuro.com/products/volvo- ... -v70-15097

The plug doesn't look like the one that Robert disconnected in his video above.

I noticed that FCP offers an extension cable that DOES look like the plug that Robert worked on:
https://www.fcpeuro.com/products/volvo- ... 14#fitment
Now I just noticed that it says that this fits 1997 850s but ours is a 1996.

The question is if the O2 sensor linked above will fit as is or will some sort of adapter be needed?
I've not gotten the old one out so I don't know what it looks like.

Anyone?