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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Nov-11-2019, 06:14:53 PM   #11
repoman89
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Default Re: O2 Sensor wire close to header

Quote:
Originally Posted by Cubieman View Post
Thanks for that part number. Looks like that part only deals with two of the o2 sensors. How exactly does the euro setup differ wiring wise as far as o2 sensors? Going to see if I can't search high and low for pictures/diagrams.
That part number has all four connectors plus EGT. Two go down the drivers side and clip to post-cat O2s, the two pre-cats go through the rubber block and sit under the beauty cover. The O2 connectors are different from the US ones ... stock Euro part numbers are the following:

pre-cat bank 1: 11781743994
pre-cat bank 2: 11781406622

post-cat bank 1: 11781405324
post-cat bank 2: 11787832035

You already have a couple of those in your US setup but they have to be switched around to use that harness. Two of them are unique to the Euro setup. I ended up buying the unique ones but it was a bit pointless .. just satisfied my car OCD. Still though I am pretty sure the pre-cat O2 wires are still routed by the headers down the passenger side like you currently have it. Just attach them to those metal clips in the heat shielding!

edit: This thread has more info on the Euro harness and swapping around O2s: http://www.m3forum.net/m3forum/showthread.php?t=469382

Last edited by repoman89; Mon, Nov-11-2019 at 06:21:53 PM.
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Old Mon, Nov-11-2019, 06:22:48 PM   #12
Cubieman
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Default Re: O2 Sensor wire close to header

Thank you so much, this information is quite specific and very helpful to me!
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Discussing O2 Sensor wire close to header in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)