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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 Sat, Dec-21-2013, 09:37:34 AM   #1
dafoe
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Default Header Install O2 Sensor wire identification

I always get questions about the wiring of the O2's from header installs. It's incredibly frustrating to work on a header install put everything back together and find you have a crossed O2 sensors. I know I've heard of horror stories where SHOPS have actually messed this up... In all fairness it's very easy to do.

I took these pics doing my last header install.

Each of the O2 plugs is uniquely keyed. Trick is, knowing what bung they should go...

Installing headers rule of thumb is to mark the wires on each side the plug before unplugging them up top. I use different color tape... remove the headers with the O2's installed, then transfer them to the new headers/cats one at a time. After install, plug them in to the corresponding marked colors.

Anyway, here are the pics and location of each sensor looking at the plug closely you can see they're all different. The precats are easy, as they're different colors. The post cats are both yellow, but keyed slightly different.

Bank 1 (cyl1-3) (Long Header) Precat o2


Bank 2 (cyl4-6) (short Header) Precat o2


Bank 1 (cyl1-3) (Long Header) Postcat 02


Bank 2 (cyl4-6) (short Header) Postcat o2


Cheers all!
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Last edited by dafoe; Sat, Dec-21-2013 at 09:54:03 AM.
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Old Sat, Dec-21-2013, 01:15:17 PM   #2
Vmals89
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Default Re: Header Install O2 Sensor wire identification

Thanks for this. This will be very useful when i install my headers over the holidays.
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Old Sat, Dec-21-2013, 07:26:48 PM   #3
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Default Re: Header Install O2 Sensor wire identification

Thanks for the extra pics Dafoe. Everything helps.


If it's hard to see some the notches on some of the pics, use this to help.

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Old Sat, Dec-21-2013, 08:03:44 PM   #4
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Default Re: Header Install O2 Sensor wire identification

Thanks guys!
Also can you reuse the sensors or do you recommend new ones when installing headers?

Cheers

George
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Old Sun, Dec-22-2013, 01:59:15 AM   #5
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Default Re: Header Install O2 Sensor wire identification

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Originally Posted by GedOz View Post
Thanks guys!
Also can you reuse the sensors or do you recommend new ones when installing headers?

Cheers

George

New ones depending on miles.... Over 50k, change them out....
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Old Sun, Dec-22-2013, 02:30:12 AM   #6
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Default Re: Header Install O2 Sensor wire identification

Thanks!

Cheers

George
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Old Sun, Dec-22-2013, 04:25:30 AM   #7
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Default Re: Header Install O2 Sensor wire identification

I got mine rite the 1st time.
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Old Sun, Apr-23-2017, 08:44:20 PM   #8
m3e46freak
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Default Re: Header Install O2 Sensor wire identification

It would appear that precat bank 2 and post cat bank one are the same sensor.

Key A and same part number on the sensor also
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Old Mon, Apr-24-2017, 02:37:27 AM   #9
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Default Re: Header Install O2 Sensor wire identification

Yes, they are the same and it's why they are really the ones that really need to be marked more so than the others.
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Old Thu, Jul-19-2018, 04:44:24 AM   #10
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Default Re: Header Install O2 Sensor wire identification

Quote:
Originally Posted by Sandeep1212 View Post
Thanks for the extra pics Dafoe. Everything helps.


If it's hard to see some the notches on some of the pics, use this to help.

Very useful thanks for posting, quick request, do you have the part number for the female connector Key A? I thought it would follow the sequence of the part numbers for Key B and C but nothing is showing up, BMW can't find it on their system either.
Regards John
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Discussing Best Daily Driver Suspension? 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)