B58 O2 Spacer That Works!

[armenh7]

I shared this in some Facebook groups but felt it's worth posting here too. This benefits people that don't want a tune OR are in a state that can detect modified tunes and so that person is forced to flash back to stock. I've had multiple FXX B58 owners use this same spacer and it worked for them too. Unfortunately, I don't have data for GXX B58 cars. I've done over 1000 miles with various types of driving. I've also accidentally reset codes while coding the car and monitors set within 1-2 drive cycles.


1. Doesn't cost $300+
2. Tunes don't pass emissions in some states and/or can be flagged as modified. Visual part is easy to find an inspector that doesn't care.
3. For people that find stock power adequate and throw a downpipe on for sound and don't want a check engine.


The straight O2 spacer worked on my car. 2017 340i with catless downpipe and stock tune. Be sure to REMOVE the mini-cat (don't reinstall the cap) that comes in the spacer otherwise it can trigger delayed rich to lean response codes. The spacer needs to be 55mm in length.
https://s.click.aliexpress.com/e/_oCjXIVR


***If you are using a catted downpipe and it sets a cat efficiency code, you can still use a spacer but it needs to be a short one. It needs to be 32mm in length.
Here is a link to one that worked. https://s.click.aliexpress.com/e/_olVwqLb

[armenh7]

Updated post with information regarding aftermarket catted downpipes.

[armenh7]

Updated dead links