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

Reply » Bosch O2 sensor substitute for the OE Siemens?

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.thepartsbin.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

Reply » Bosch O2 sensor substitute for the OE Siemens?

Quote:

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

Reply » Bosch O2 sensor substitute for the OE Siemens?

Quote:

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 !

Reply » Bosch O2 sensor substitute for the OE Siemens?

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.

Reply » Bosch O2 sensor substitute for the OE Siemens?

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

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