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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 Fri, Sep-25-2015, 12:54:53 AM   #21
Edgy
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

Good point. I have an aftermarket Agency Power section 1, Supersprint 2 and Agency Power 3, but no aftermarket headers.

Shouldn't affect this DIY, correct?

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Old Fri, Sep-25-2015, 05:04:55 PM   #22
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

That's right, it will not affect the install. I know a lot of people keep saying to access from the top, but I'm thinking you will have better access from the bottom, with the reinforcement plate removed but it is the most difficult sensor to access for sure.
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Old Wed, Dec-30-2015, 07:08:44 PM   #23
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Default M3 E46 Pre Cat O2 sensor replacement...

Bumping up this thread... Doing both my precat O2 sensors, I removed the egr valve and have the heat shield above the headers loose, but I can't get it out. It seems impossible without disconnecting this coolant line:


Can anyone tell me how they got their heat shield off? And if I have to disconnect the coolant line, is all of my coolant in the reservoir going to drain out?? That would be a pita

Edit:

After taking off the lower skid plate I realized that with my sgt headers all four oxygen sensors are pretty easily accessible under the car. Looks like I didn't need to loosen the heat shield in the first place!
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Old Thu, Jan-12-2017, 11:34:54 PM   #24
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

Quote:
Originally Posted by ZiMMie View Post
I personally use Bosch 15703 sensors. Just cut the old harness and mate it on the new sensor.

they are $25 each (or less) sensor, exact same narrowband sensor as the OE sensor.
Can anyone else vouch for this?
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Old Sun, Mar-04-2018, 03:38:51 AM   #25
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Exclamation Re: M3 E46 Pre Cat O2 sensor replacement...

Quote:
Originally Posted by ZiMMie View Post
I personally use Bosch 15703 sensors. Just cut the old harness and mate it on the new sensor.

they are $25 each (or less) sensor, exact same narrowband sensor as the OE sensor.
You have no idea what you are talking about. Anyone reading this do not do this.
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Old Sun, Mar-04-2018, 03:39:22 AM   #26
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Exclamation Re: M3 E46 Pre Cat O2 sensor replacement...

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Originally Posted by 206m3 View Post
Can anyone else vouch for this?
Yes...DO NOT DO THIS.
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Old Sun, Mar-04-2018, 05:04:10 AM   #27
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

BTB, why are you removing things? I just changed my pre cat o2s with a crow's foot and the only thing I did besides jacking the car up was removing the valve beauty cover to expose the harnesses for the O2s.
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·Besian · RE pullies/fan delete · WPC rod bearings · GroundControl S/A (Koni/Eibach 440/550) + tall RSMs · TMS Camber & Subframe plates · SPC Adj alloy rear camber arms
·RE Trans Mounts · AKG poly SUB/DIFF 95a · SDW RTAB · Weighted ///M knob + UUC DSSR + delrin carrier bush · OE CSL trunk · APEX 75mm Studs
·Sportline 8S 18"x8.5/9.5" · MPSS 245/275 · Brembo 996 36/40 345mm CSL Textar FF & 28/30 328mm CSL ATE "D738" FF · CM brackets & ss/teflon lines
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Old Sun, Mar-04-2018, 05:04:52 AM   #28
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

Quote:
Originally Posted by E36Alpine View Post
Yes...DO NOT DO THIS.
Why? It's perfectly fine if you have decent wire splicing skills.
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·Evolve-R Alpha N · Evolve CSL CF Airbox · Eventuri Scoop · Supersprint V1 stepped 63mm · SS V1 S pipe 63mm + 200 cell HFC · OE sect 2 60mm · SS Sport 60mm
·Besian · RE pullies/fan delete · WPC rod bearings · GroundControl S/A (Koni/Eibach 440/550) + tall RSMs · TMS Camber & Subframe plates · SPC Adj alloy rear camber arms
·RE Trans Mounts · AKG poly SUB/DIFF 95a · SDW RTAB · Weighted ///M knob + UUC DSSR + delrin carrier bush · OE CSL trunk · APEX 75mm Studs
·Sportline 8S 18"x8.5/9.5" · MPSS 245/275 · Brembo 996 36/40 345mm CSL Textar FF & 28/30 328mm CSL ATE "D738" FF · CM brackets & ss/teflon lines
·Pioneer DEH-80PRS · Eclipse PA5422 · CDT HD-6 + WS-100i · CDT EX-530 · 8" Kicker

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Old Sun, Mar-04-2018, 06:37:38 AM   #29
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

Quote:
Originally Posted by E36Alpine View Post
You have no idea what you are talking about. Anyone reading this do not do this.
Ok Buddy..

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Old Mon, Mar-12-2018, 05:55:19 AM   #30
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Default Re: M3 E46 Pre Cat O2 sensor replacement...

Quote:
Originally Posted by TboneM3 View Post
Why? It's perfectly fine if you have decent wire splicing skills.
Quote:
Originally Posted by ZiMMie View Post
Ok Buddy..

Sent from my Redmi Note 4 using Tapatalk
So just to clarify they are the same sensor with a different plug? I just got a SES for pre cat O2's tonight and I have no problem wire splicing.
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Discussing M3 E46 Pre Cat O2 sensor replacement... 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)