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Old 03-10-2008, 04:37 PM   #1
sdbimmer
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O2 Bank 2 Sensor 1, which one?

Question for you guys: which O2 sensor is the Bank 2 Sensor 1? I know it's the Pre-Cat sensor, but which one is it. There are two, one closer to the firewall and one closer to the front of the car.

Can anyone tell me which O2 Sensor is Bank 2 Sensor 1?


Thanks a lot.
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Old 03-10-2008, 05:11 PM   #2
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Originally Posted by sdbimmer View Post
Question for you guys: which O2 sensor is the Bank 2 Sensor 1? I know it's the Pre-Cat sensor, but which one is it. There are two, one closer to the firewall and one closer to the front of the car.

Can anyone tell me which O2 Sensor is Bank 2 Sensor 1?


Thanks a lot.
It's the one on top of your manifold. The easy one to get to. If you remove the plastic cover you'll see it.
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Old 03-10-2008, 05:17 PM   #3
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But isn't there like two of them on top? I think only one of my sensors is defective. Since it cost an arm and a leg to replace, i want to see if I can replace just the bad one, which it Bank 2 Sensor 1.

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Old 03-10-2008, 05:18 PM   #4
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bank one is cylinders 1-3 bank 2 is cylinders 4-6 so its the rear manifold top sensor
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Old 03-10-2008, 05:31 PM   #5
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So looking at the diagram, it should be #2 sensor (one closes to the firewall)?

Thanks for the info.
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Old 03-10-2008, 07:26 PM   #6
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You don't say what your mileage is, but if you are at the point where you're replacing the O2 sensors, do yourself a favor and do them both at the same time. For the $70 or so for the second sensor you'll buy yourself another 100K.
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Old 03-10-2008, 07:37 PM   #7
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Usually you change them in pairs. Unless one went out prematurely you should replace both precat ones.
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Old 03-10-2008, 08:03 PM   #8
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It's an 2004 and has 86k miles. The cheapest I found that is a (Bosch) direct plug-in is from Autohausaz for $135.00. Part# 17216

http://www.autohausaz.com/search/pro...xygen%20Sensor
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Old 03-10-2008, 08:41 PM   #9
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Quote:
Originally Posted by sdbimmer View Post
It's an 2004 and has 86k miles. The cheapest I found that is a (Bosch) direct plug-in is from Autohausaz for $135.00. Part# 17216

http://www.autohausaz.com/search/pro...xygen%20Sensor

i had one go bad around mmmm maybe 25k miles, i can't remember, but the car was out of warranty so i bought a new one through the local bmw parts dept. and paid less than that.
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Old 03-11-2008, 02:43 AM   #10
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Yeah, I think the 2003-2006 models use the newer O2 Sensor. Which cost a lot more than the older ones.

http://www.realoem.com/bmw/showparts...55&hg=11&fg=50

Here is a pic of the older O2 Sensor:



older sensor plug:



and the newer O2 sensor looks like this, I guess:



Last edited by sdbimmer; 03-11-2008 at 03:39 AM.
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Old 03-11-2008, 07:53 AM   #11
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The last time I replaced an O2 sensor was on my dad's eclipse, and I bought a bosch universal (you have to splice the wires) for $60 instead of the $100 for the one with the connector.

When I had to replace the second one (and I did have to replace the second one shortly after), I found that autzone had the bosch one with the connector for $75. Not sure if they've dropped in price or what, but I was pleasantly surprised to see that autozone had a really good price for something I could pick up right away.
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Old 03-11-2008, 07:54 AM   #12
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Oh, and I don't know how much your time is worth, but Im not getting another universal O2 sensor if I can help it. The thing worked fine, but it took my about 30 minutes to crimp all the wires and seal them up. Not worth the small difference in price for me.
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Old 03-11-2008, 12:06 PM   #13
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So looking at the diagram, it should be #2 sensor (one closes to the firewall)?
Yes. Bank 2 is the header closest to the firewall.

If you have to do bank 2, sensor 2, then it is the oxygen sensor that is more difficult to reach (sensor furthest from the center of the car).
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Old 03-11-2008, 11:31 PM   #14
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Just for future reference, here it is:


Last edited by sdbimmer; 03-11-2008 at 11:37 PM.
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Old 06-11-2012, 01:55 PM   #15
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Hello Sdbimmer !! Thank u fo the diagrams!! I have the same problem, now I can see clearly which one i need but most likely I might have to buy both . Is it true that both top 2 sensors are the same . One out of two dealers told me that the pre cat sensors are the same ..well to my 08/528xi ..? the other dealer told me differently so I took non of their advice !!
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Old 06-11-2012, 02:17 PM   #16
sdbimmer
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combo9011, for your car...08/528xi it is different (length wise at least). This is what i got from RealOEM.


Last edited by sdbimmer; 06-11-2012 at 02:19 PM.
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Old 06-11-2012, 02:26 PM   #17
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@sdbimmer ! Oh thank u so much !! I really apreciated ..! So the #2 is the one I need replace according to the chart ? The chart is actually similar to your previous charts
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Old 06-11-2012, 02:38 PM   #18
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#2 is (Bank 2, Sensor 1) and for your car it is a little shorter than the sensor in the front. they are basically the same sensor. If the shop doesn't have #2, you can probably just buy #1 to put into #2 position. That's probably the reason why the shops are telling you both answers.
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Old 06-11-2012, 02:46 PM   #19
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I'm happy !!! Good and fast advice sdbimmer!!!!
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Old 06-11-2012, 02:54 PM   #20
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You're welcome. Good luck on your fix. For me, I only replace just that one bad sensor. These sensors are expensive, so I only replace just one. It's been running great for the past couple of years. I don't think replacing one bad sensor affected the gas mileage either, so I'm ok with it so far.
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