DIY: Extending O2 wiring for Section 1 with Cats (Repost; PDF)

[Will]

Original author: "wsl"
From: m3forum
Date of PDF: 8/16/16

Extending O2 wiring for Section 1 with Cats - BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80:X).pdf

[Carl Spackler]

Useful for an upcoming project, thanks.
Is there a Part Number for the OEM wire holder?

[old///MFanatic]

Sorry to thread jack but it's 02 Sensor related. Does anyone have a backup of the DIY for E46 M3 pre-cat 02 sensors.
The photos and tricks from this old thread?

http://www.m3forum.net/m3forum/showthread.php?t=321070

[repoman89]

I did this a few years ago, but if you are as car OCD as I am you'll probably end up replacing your US O2 harness with a Euro one, like I did a couple years later. Easy swap but requires switching around O2 sensors and buying one new one that US cars don't have. You can get a Bosch version for $50 on eBay, and the harness was around $200 when I bought it. Trading a few hundred bucks for some time and cleaner end result, ymmv on which option is better.

[terra]

I did this a few years ago, but if you are as car OCD as I am you'll probably end up replacing your US O2 harness with a Euro one, like I did a couple years later. Easy swap but requires switching around O2 sensors and buying one new one that US cars don't have. You can get a Bosch version for $50 on eBay, and the harness was around $200 when I bought it. Trading a few hundred bucks for some time and cleaner end result, ymmv on which option is better.

Almost exactly what I did. Though instead of buying the last Euro-spec sensor, I shortened the wires and dremeled out the key on the connector to let it fit into the harness.