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      03-04-2013, 10:14 PM   #1
mikeokimster
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O2 sensor replacement and alternatives

The bank two pre-primary cat o2 sensor went out due to a short. The dealer is charging $289.00 for this parts WTF!?!? Is there anyone that is running any alternatives?

My rear o2 sensors are disabled with the ESS tune. Are there any differences in the physical capabilities between the front and rear o2 sensors or is it just the cable length? I have done a few searches to no avail..

EDIT: I found out that the front sensors are wideband and the rear sensors are narrow band



No. Description Supplement
Qty Part Number

01 REGULATING LAMBDA PROBE L= 340MM
2 11787537984

03 Lambda probe, black L= 325MM
2 11787539125
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      03-04-2013, 10:16 PM   #2
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Sounds about right. And they sensors r different
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      03-04-2013, 10:20 PM   #3
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Quote:
Originally Posted by Chriskm3 View Post
Sounds about right. And they sensors r different
Just found out they are arrrggghhhh



Is anyone running aftermarket front wideband o2 sensors? If so what brand and was it plug and play?
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      03-04-2013, 11:07 PM   #4
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Call me crazy, but I don't think the price is that bad given the cost of the car.
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      03-05-2013, 09:02 AM   #5
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Quote:
Originally Posted by Bmw135er View Post
Call me crazy, but I don't think the price is that bad given the cost of the car.
When warranty runs out these cars can be expensive to repair
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      03-05-2013, 09:10 AM   #6
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reading comprehension fail...Pre-primary - my bad

Last edited by happos2; 03-05-2013 at 10:30 AM.
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      03-05-2013, 10:17 AM   #7
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The car needs both primary 02 to run properly. The 02 looked pretty standard to me, like Bosch WB02, but I did not check for part numbers or do any cross referencing when I had them out.

What sometimes happens is people twist them out instead of disconnecting the harness and unscrewing them, when changing the midpipe to an x-pipe. The top of the 02 is sharp and cuts into one or more of the wires, either severing it or shorting it. Left alone, they are pretty reliable and designed to run 100k miles.
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      03-05-2013, 03:10 PM   #8
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Furious Method

11787537984
Bosch are available for less than $150

go to furiousmethod.com and plug in part number.
It will search 20 part suppliers.
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      03-05-2013, 03:31 PM   #9
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$147 at one of my regulars, autohausaz.com
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      03-05-2013, 09:18 PM   #10
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Yep, just make sure it is the correct Bosch sensor. You can get it less than the dealer is charging for sure.
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      03-05-2013, 10:47 PM   #11
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Quote:
Originally Posted by mikeokimster View Post
The bank two pre-primary cat o2 sensor went out due to a short. The dealer is charging $289.00 for this parts WTF!?!? Is there anyone that is running any alternatives?

My rear o2 sensors are disabled with the ESS tune. Are there any differences in the physical capabilities between the front and rear o2 sensors or is it just the cable length? I have done a few searches to no avail..

EDIT: I found out that the front sensors are wideband and the rear sensors are narrow band



No. Description Supplement
Qty Part Number

01 REGULATING LAMBDA PROBE L= 340MM
2 11787537984

03 Lambda probe, black L= 325MM
2 11787539125
http://www.ecstuning.com/BMW-E92-M3-S65_4.0l/ES2226210/
Replace both of them !
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      03-06-2013, 08:04 AM   #12
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That link is for the narrow band 4 wire post cat 02. I think ECS charges $167 for the wide band five wire primary 02s.
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      03-26-2013, 01:47 AM   #13
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Can the pre-cat sensors be swapped on jack stands at home with standard tools? It's hard to tell in the diagram, but hoping the pipes don't need dropping?
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      03-26-2013, 02:15 AM   #14
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Quote:
Originally Posted by MFKN3 View Post
Can the pre-cat sensors be swapped on jack stands at home with standard tools? It's hard to tell in the diagram, but hoping the pipes don't need dropping?
You won't be able to get an o2 sensor socket on them, but you can just use an open ended wrench to get them out. Shouldn't have to drop the x-pipe.
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      03-26-2013, 09:12 PM   #15
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Quote:
Originally Posted by mikeokimster View Post
The bank two pre-primary cat o2 sensor went out due to a short. The dealer is charging $289.00 for this parts WTF!?!? Is there anyone that is running any alternatives?

My rear o2 sensors are disabled with the ESS tune. Are there any differences in the physical capabilities between the front and rear o2 sensors or is it just the cable length? I have done a few searches to no avail..

EDIT: I found out that the front sensors are wideband and the rear sensors are narrow band



No. Description Supplement
Qty Part Number


01 REGULATING LAMBDA PROBE L= 340MM
2 11787537984

03 Lambda probe, black L= 325MM
2 11787539125


One of my pre-cat 02 sensors went out this week as well. I called about 5-6 places and found that ECS was the cheapest at $148 for the Bosch branded sensor. From what I was told, Bosch makes the OEM 02 sensor for BMW, so you might as well buy the cheaper Bosch sensor, since it's literally the same thing....and about $40 cheaper than the OEM one. (ESC was selling the OEM one for about $190)
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      03-26-2013, 09:31 PM   #16
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Yeah I paid like $180 including installation from my local shop. Check out the link IMG posted...
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      07-16-2013, 08:42 PM   #17
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....and mine went bad last week. Lovely. Time to shop around. Same part 11787537984.
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      07-17-2013, 12:11 AM   #18
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You can get it less than the dealer is charging for sure.
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      07-17-2013, 08:33 AM   #19
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Quote:
Originally Posted by GOVCO View Post
....and mine went bad last week. Lovely. Time to shop around. Same part 11787537984.
I replaced mine. The cheapest I found around was on Amazon. $112 for the front and about $90 for the rear. I saved on the labor as I did the work myself when the car was up on jackstands. I hope this helps!!

Are are the links:

Pre-Cat
http://www.amazon.com/Bosch-17039-Ox.../dp/B000JZEXG8

Post-Cat
http://www.amazon.com/Bosch-16793-Ox...1&s=automotive
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      07-17-2013, 06:43 PM   #20
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Thanks everyone.....for some reason the check engine light is now off....[scratches head]... hmmmm....
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      07-17-2013, 08:57 PM   #21
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Quote:
Originally Posted by happos2 View Post
I replaced mine. The cheapest I found around was on Amazon. $112 for the front and about $90 for the rear. I saved on the labor as I did the work myself when the car was up on jackstands. I hope this helps!!

Are are the links:

Pre-Cat
http://www.amazon.com/Bosch-17039-Ox.../dp/B000JZEXG8

Post-Cat
http://www.amazon.com/Bosch-16793-Ox...1&s=automotive
The precat 02, Bosch 17039, is about $65 shipped on ebay, but with some searching, you can find them for about $55 shipped. This is actually a little cheaper than the best price I have seen for the post cat 02.
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      07-17-2013, 09:14 PM   #22
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Quote:
Originally Posted by pbonsalb View Post
The precat 02, Bosch 17039, is about $65 shipped on ebay, but with some searching, you can find them for about $55 shipped. This is actually a little cheaper than the best price I have seen for the post cat 02.
Good find! I have had one too many bad experiences with EBAY so I didn't even look there. But that is some good information!
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