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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 09-04-2013, 12:02 AM   #1
sylvea
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Join Date: Jun 2007
Location: Mountain View, CA
Posts: 17
My Ride: 2003 325i
Pre-cat O2 Sensor Problem

A year ago I had about 90k on my 2003 325i when I threw a (IIRC) two O2 sensor faults. I replaced all four O2 sensors since they were near their lifetime and didn't feel like going through the routine 2 months later when/if the other 2 failed.

Now 18 months later, I threw a 20c2973 "PreCat O2 sensor/wires Bank 1" fault on my Peake scanner. These have a 1 year warranty so it would be out of my own pocket. Before I lay out $161 for a new sensor, is there any reason why I would throw this code if it wasn't the sensor that failed?

I do have a California smog/emissions inspection coming due and figured I'd take care of this before I take it in even though I understand it is the post-cat O2 sensors that control emissions.

Thanks in advance:
GS
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Old 09-04-2013, 01:03 AM   #2
e4603
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Join Date: Jul 2006
Location: Cali
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My Ride: #3 bus
Quote:
Originally Posted by sylvea View Post
Before I lay out $161 for a new sensor
Bosch O2 sensor at Amazon for about $50.
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Old 09-04-2013, 01:08 AM   #3
sylvea
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Can you post the link?

This one is $173 including shipping.
http://www.amazon.com/03-06-Oxygen-S...1+78+7+523+434

~GS
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Old 09-05-2013, 12:19 AM   #4
Mrpoman
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Join Date: Apr 2012
Location: San Diego
Posts: 6
My Ride: 04 330cic
Pre-cat O2 Sensor Problem

I just bought one and installed for the rear pre cat for an 04 330. If you search for 17216 (rear, bank 2) on amazon you can find the one fulfilled by amazon for about $90. I think the front (bank 1) is 17215.


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Old 09-10-2013, 06:02 PM   #5
comova
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Join Date: Apr 2007
Location: City of Angels
Posts: 213
My Ride: Silver 325Cic
I literally just (AM) bought the last $50 Amazon O2 sensor from 'Delaware'. I email them to ask if they were getting more (because I need 2) ...Bruce only said "out of stock"
I hit AutohausAZ for the second one, It was 20 bucks more but shipping was free.
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Old 09-10-2013, 11:07 PM   #6
e4603
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Quote:
Originally Posted by sylvea View Post
Can you post the link?
Sorry for the late reply; just got back from Maui. See if this one (bosch 13477) fits your car:

http://www.amazon.com/Bosch-13477-Ox...ds=bosch+13477

http://www.boschautoparts.com/Vehicl...artFinder.aspx

Last edited by e4603; 09-10-2013 at 11:34 PM.
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Old 10-13-2013, 01:54 AM   #7
sylvea
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Location: Mountain View, CA
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My Ride: 2003 325i
Uggg. Replaced the O2 sensor. $90 (thanks for the links). Drove the car 200 miles. No codes. I'm happy. Drove another 100 miles and it threw the 20c2973 code (PreCat O2 Sensor Wires/Lines, Bank 1) again. Any suggestions on what's causing this?

Thanks in advance!
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Old 10-28-2013, 06:35 PM   #8
e4603
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Join Date: Jul 2006
Location: Cali
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My Ride: #3 bus
Did you try swapping the 2 sensors and see if the problem follows the sensor?

Remove plastic engine cover and check if the sensor wires are good.

Maybe use this type of o2 sensor socket
http://www.pelicanparts.com/BMW/tech...mall/pic05.jpg
instead of this
http://www.availabledark.com/images/bmw/o2diy01.jpg
so you don't put pressure on the wiring during install.
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