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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 Thu, May-15-2014, 02:49:37 AM   #21
bmwJohhnyD
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Default Re: Extending OEM O2 wiring for Section 1 with Cats

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I wish our us spec heat shield had those clips (or at least I'm 99% sure we don't). I tried zip tying them out of the way, and they just melted. Thankfully the O2 wire insulation seems to be able to withstand high temperatures.
LOL i was just looking at mine over the weekend.. i realized that my zip ties have melted also!!

i reaalllly reallly reallly wish that someone would post the complete routing from a euro car dme all the way to the 02 sensors just so i can physically look at it..

maybe i need to fly to .de and go to some junkyards..
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Old Thu, May-15-2014, 03:08:46 AM   #22
terraphantm
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Default Re: Extending O2 wiring for Section 1 with Cats

You and me both. Though I don't really want to buy a whole new harness just for these sensors lol.
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Old Thu, May-15-2014, 05:48:45 AM   #23
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Default Re: Extending O2 wiring for Section 1 with Cats

Looks like this is the right clip: 12521437136



I guess we'd just need to cut a couple slots into the heat shield and slide it in. I'll drop by my local dealer tomorrow and pick up a few
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Old Thu, May-15-2014, 05:59:03 PM   #24
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Default Re: Extending O2 wiring for Section 1 with Cats

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Looks like this is the right clip: 12521437136



I guess we'd just need to cut a couple slots into the heat shield and slide it in. I'll drop by my local dealer tomorrow and pick up a few
keep us posted.
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Old Fri, May-16-2014, 12:03:55 AM   #25
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Default Re: Extending O2 wiring for Section 1 with Cats

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keep us posted.
My local dealer didn't have them in stock and minimum order was 20 pieces Needless to say I didn't order them. I looked under the car, and our heat shield already has slots cut out for those clips.

I'll try rigging something up
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Old Thu, May-22-2014, 08:24:40 AM   #26
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Default Re: Extending OEM O2 wiring for Section 1 with Cats

When using a euro style section 1. And the EGT port is in the same location as the euro section 1. Is it necessary to route the EGT wiring the same way as the post cat O2 sensors?

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Old Fri, May-23-2014, 03:24:32 AM   #27
terraphantm
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Default Re: Extending OEM O2 wiring for Section 1 with Cats

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When using a euro style section 1. And the EGT port is in the same location as the euro section 1. Is it necessary to route the EGT wiring the same way as the post cat O2 sensors?

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Don't know if it's necessary, but I rerouted it. Little cleaner that way
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Old Wed, Jul-23-2014, 01:31:45 AM   #28
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Default Re: Extending O2 wiring for Section 1 with Cats

Found the part number for the Euro O2 sensor harness -- 12517835524. Actually not that expensive


http://www.ecstuning.com/ES31085/
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Old Wed, Jul-23-2014, 02:21:46 AM   #29
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Default Re: Extending O2 wiring for Section 1 with Cats

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Originally Posted by terraphantm View Post
Found the part number for the Euro O2 sensor harness -- 12517835524. Actually not that expensive


http://www.ecstuning.com/ES31085/
so these should reach all the way to the euro cats?
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Old Wed, Jul-23-2014, 03:36:16 AM   #30
terraphantm
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Default Re: Extending O2 wiring for Section 1 with Cats

Yep. Keep in mind that loom is for the manual cars.

One thing I'm not sure about is the fuel pump relay signal wire. On US cars, it's on the same connector block as the O2 sensors; on Euro cars, it's on a different block. You might have to separate that wire and then fish it back through the Euro harness. RealOEM also shows different part numbers before and after 09/2003, so there might be some DSC wiring with that harness (that's the only thing that changed in 09/2003 as far as I'm aware)

http://www.realoem.com/bmw/showparts...95&hg=12&fg=28


Edit: Actually DSC changed in 09/2002... I have no idea what changed in 09/2003 besides the switchover to the MSS54HP (which has the same pinout as the MSS54 non-HP).
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Discussing Extending O2 wiring for Section 1 with Cats 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)