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Extending O2 wiring for Section 1 with Cats (Repost; PDF)
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?
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.
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.
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