O2 Sensor

[M3Mathes]

My O2 sensor on 1999 R1100s is not working. Is there any way to replace it without removing the exhaust?

[Groceryrun]

I was able to replace the O2 sensor on my 2004 R1100S without removing the exhaust.
It was some time ago , but I do not think that I had to loosen any part of the exhaust system.
I did have to remove the fairing ( body panel ) because the connect is behind it.

Does there look like there's not a lot of room on the 1999 ?

[M3Mathes]

I was able to get an offset socket onto the sensor but can't rotate it. The regular type O2 socket is too long and bumps into the gear box so I will have to use the offset type. If I could move the collector/catalytic converter (BMW calls it the front silencer) just a little I might have enough room. I'll try to take off the triangular mount on the bottom of the converter and see if that allows it to move enough. Thanks

[Groceryrun]

I used an Open End wrench and a
Crows Foot Wrench.

[M3Mathes]

I've been soaking in PB Blaster so it might come off with an open end or flare nut wrench. Thanks for the reply.

[sgoodwin]

If PB doesn't work try Kroil, I find it to work better freeing up stuck bolts. It penetrates so well it leaks out the top of its own can, so I buy it in spray cans now.