Question on number of O2 sensors on a 2011 335i

[ArcticWhite]

I've got an N55 335i that when I put a downpipe on it (using the O2 sim) I got a slow response code from the front O2.

Are there 4 O2 sensors on this car? I'm going to be putting a catted downpipe back on the car as it is becoming the wife's car and she wants it quieter. When I do that, I want to replace the O2's. Want to make sure I order the right ones and the right number.

Thanks.

[jclausen]

Yes

[White94RX]

Yes, there are four. Two pre-cat, and two post-cat.

[Codes2]

I've got an N55 335i that when I put a downpipe on it (using the O2 sim) I got a slow response code from the front O2.

Are there 4 O2 sensors on this car? I'm going to be putting a catted downpipe back on the car as it is becoming the wife's car and she wants it quieter. When I do that, I want to replace the O2's. Want to make sure I order the right ones and the right number.

Thanks.


Certainly look it up on Real OEM using your VIN as well.
http://www.realoem.com/bmw/enUS/select

Here you can find the correct PNs, whether you order here, Rock Auto, or wherever.