Tuneless header CEL fix for ///Ms.

[SwapMag1c]

any word of this for the Non-m?

[EMP07]

Originally Posted by kav

Yup, after installing the Euro header I installed the secondary O2 sensors behind the secondary cats. I had problems initally when the shop I used cut the wires to extend them. I repalced both sensors and just unfolded the wiring harness out to length and it has been running great with no CEL!

What do you mean "unfolded the wiring harness"?

Anyone running euro/csl with removing the secondary o2 bungs?

Sorry to digress a bit.

[pokeybritches]

Originally Posted by SwapMag1c

any word of this for the Non-m?

You should check the section 1 of your exhaust for cats (I haven't looked into it). If you have "secondary cats" (cats in section 1 as well as in your headers) you can weld an O2 sensor bung for the secondary O2 sensors right after the section 1 cats and the car shouldn't throw a code. I haven't heard of anyone doing this for the non-M Z4's, but if you check the M54 3-series forums you might find more info about it. S54 guys use the same trick to get around the SES light without buying a sim or tune.

[kav]

Originally Posted by F1soul

What do you mean "unfolded the wiring harness"?

Anyone running euro/csl with removing the secondary o2 bungs?

Sorry to digress a bit.

The 02 sensor harness was cut loose from the loom holding it to the rest of the wiring. This frees up a lot of length. So you can relocated it behind the secondary cats without having to cut or add length to the wires.