Euro header install - euro O2 sensor routing?

[JakeM346]

For the o2 sensor plug you also need this bracket

[Maxhouse97]

Ok I was concerned about rooting the pre cats the old way and keeping them off the headers (keep them away from the heat). But I’ll take a look.

Why do I need that bracket exactly? Just to hold the location of the wire? Where did you get it?

[Maxhouse97]

Found this post that explains a lot, appliance searched better.

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/38609-euro-cats-require-lengthened-egt-o2-sensor-wires/page3

[Cubieman]

Ok I was concerned about rooting the pre cats the old way and keeping them off the headers (keep them away from the heat). But I’ll take a look.

Why do I need that bracket exactly? Just to hold the location of the wire? Where did you get it?

I poked a few holes in the heatsheild and ran heat resistant zip ties through to secure the wiring right above the sensors. I also used those U shaped rubber coated "hangers" that you can find at the hardware store, 2 of them found spots right where a factory bolt was present and holds the wire in just the right area. Not OEM, but works and looks great.

[Slideways]

Ok I was concerned about rooting the pre cats the old way and keeping them off the headers (keep them away from the heat). But I’ll take a look.

Why do I need that bracket exactly? Just to hold the location of the wire? Where did you get it?

On the heat shield above the headers, there are two metal clips that hold the pre-cat sensors away from the headers. The factory routing is the best for those two. For the post-cat and EGT, those are going down the driver's side of the transmission along the transmission tunnel where there are plastic clips that hold the gear position and trans temp sensor wires. Once the wires get to the transmission tunnel heat shield, they can be clipped to the transmission tunnel heat sheild using those same clips found on the header heat shield - probably need 4 of the metal clips.



This method of using the clips looks factory-ish and the O2 sensors will be easily removable when it comes time to remove the exhaust.

If the plastic bracket on the Euro cars that holds the post-cat sensors was readily available, that would be the best option, but one or two of the metal clips (pictured above) is still required to clip and hold the post-O2 sensor wires above the cats.

[JakeM346]

Ok I was concerned about rooting the pre cats the old way and keeping them off the headers (keep them away from the heat). But I’ll take a look.

Why do I need that bracket exactly? Just to hold the location of the wire? Where did you get it?

The bracket can be ordered from bmw. It’s so your o2 sensor connector is secured properly and also prevents it from being that and coming loose.
The pre cat routing is basically the same as all us models. You just have to use the before mentioned clips and heat won’t be a problem at all

[JakeM346]

Also on the valve cover in the cylinder head there are 2 mounts. One is from metal for the pre cats. That one is in the euro and is cars and the us cars have the second bracket two which the Euro Cars have in a different shape under the car

[Maxhouse97]

Yep things worked out. Here are pics of how I did it. I did but a used euro plastic bracket, that plus zip ties made it easy. Also used self vulcanizing tape to weather insulate the wires.