Bosch O2 sensor substitute for the OE Siemens?

Recently had my CATs replaced under warranty with surprisingly little grief from the dealer. I had not failed emissions but there was a noticeable rattle from inside them. 80K is the cut-off and I rolled it into the dealer at 79,800.
Anyway, since the change, and since they didn't change the O2 sensors after the CATs and since they have never been changed.... Let's change them!

Now for the question. I find the Bosch 13981 listed as an OE replacement (I double checked this on the Bosch US site) for the after-CAT OEM siemens unit but it is not exactly clear that this is correct. I have read threads that seem to state that the rich signal between these two sensors is reversed.

For a 99’ S52, has anyone substituted the factory siemens O2 sensor with the Bosch (13884 or 13981) sensor?

Thanks

I've used a Bosch 13884 in my 1997 328is, and another one sitting on my desk waiting to be installed.
I got mine from www.***********.com

I have a PDF of all the cross references, can't post the whole thing, but:
BMW # NTK Denso Bosch Walker
BMW 11781406981 25013 N/A 13981 250-24515

Originally Posted by Giznaz

I've used a Bosch 13884 in my 1997 328is, and another one sitting on my desk waiting to be installed.
I got mine from www.***********.com

I have a PDF of all the cross references, can't post the whole thing, but:
BMW # NTK Denso Bosch Walker
BMW 11781406981 25013 N/A 13981 250-24515

Just the right info I needed... Thanks and welcome to the forums

Originally Posted by HaqDeluxe

Just the right info I needed... Thanks and welcome to the forums

Thanks. I've lurked here for a long while. I'm a roadster type, most of you are just a bit "coupie" for me !

Giznaz,
This is absolutely the best technical forum for BMW Z cars, Coupe or Roadster, Z3 or Z4, bar none.

And unless you present yourself as a real troll, there is little likelihood of getting flamed here for asking an innocent question (something I've seen happen on Roadfly a time or two - one of the reasons I go there very infrequently.

I spend most of my time here lurking as well, but have learned a great deal and try to contribute when I feel I have something to add.

Thanks. BTW, I see you're in the neighborhood! I wonder if it is YOUR car everyone sees that matches mine!

There aren't that many Oxford Green M Roadsters around the Seattle area (really only one that I've ever seen besides mine). Mine's a bit modified, but the only things that really show are the roll bar/fire extinguisher/harness bar setup and the LAP DOG license plate. All the rest of it is in stealth mode (just the way I like it)

Mine is Boston Green with chrome gills, but to uneddicateds, Boston Green & Oxford Green would likely been remembered as the same color. At least until seen together.

Haven't been driving it much. It's living in the warehouse waiting for sunny weather.

Oh, yeah! That's what today is! Well, over 55 and sunny!