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Old 05-26-2013, 05:17 AM   #1
PerfectStorm01
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O2 Sensors

Hi guys, my car has about 166k kms so I'm thinking about changing my precat o2 sensors as PM. I was looking to get them from the US, but I can't find the correct part numbers at ecs or oembimmerparts. Are o2 sensors for European cars different than US cars? If so, where does everyone get their o2 sensors?
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Old 05-26-2013, 09:55 PM   #2
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Chuck the last seven digits of your VIN into realoem.com and paste the part number straight into pelican, that's how I do it!
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Old 05-27-2013, 07:02 AM   #3
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Chuck the last seven digits of your VIN into realoem.com and paste the part number straight into pelican, that's how I do it!
Thanks. Never really tried pelican, but apparently they are getting it direct from BMW or some other warehouse because it wasn't listed with the other o2 sensors. I used the search and it came up with it for $227
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Old 05-27-2013, 06:09 PM   #4
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Originally Posted by PerfectStorm01 View Post

Thanks. Never really tried pelican, but apparently they are getting it direct from BMW or some other warehouse because it wasn't listed with the other o2 sensors. I used the search and it came up with it for $227
http://www.ecstuning.com/Search/11781742050/
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Old 05-27-2013, 06:13 PM   #5
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http://realoem.com/bmw/partxref.do?p...r=1&series=E46

Front lambda probe appears to be the same across all E46 6 cylinders.
PS. they sell as singles but the car uses 2.
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Old 05-29-2013, 06:00 AM   #6
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Originally Posted by E46 Coupe View Post
http://realoem.com/bmw/partxref.do?p...r=1&series=E46

Front lambda probe appears to be the same across all E46 6 cylinders.
PS. they sell as singles but the car uses 2.
I thought so too, but when I plug in my vin I get some odd o2 sensor part number that no one carries except uk websites.

Yeah, I know and that's what was so scary. I would have to spend over $400 for a pair

I'm going to keep looking, thanks for your help.
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Old 05-29-2013, 06:21 AM   #7
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What part number you get?
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Old 05-29-2013, 06:28 AM   #8
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Originally Posted by E46 Coupe View Post
http://realoem.com/bmw/partxref.do?p...r=1&series=E46

Front lambda probe appears to be the same across all E46 6 cylinders.
PS. they sell as singles but the car uses 2.
This is strange. I didn't realise that the link you provided was to a part cross check page. My car is on it! But what does the type code for the car mean? Mine is a BN12.

When I look up my vin on realoem I get 2 part numbers for the pre cats based on the 2 banks - 11787503441 and 11781437586. Neither one of these appear on the link you provided.
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Old 05-29-2013, 06:35 AM   #9
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Ohhh it's the lead/wire length! Durr.
32cm for LHD and 57cm for RHD.
Sorry didn't pickup on that when I used the PN cross check.
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Old 05-29-2013, 06:44 AM   #10
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I don't understand why a LHD and a RHD would make a difference. Isn't the engine and related components positioned the same?
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Old 05-29-2013, 06:45 AM   #11
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Possibly other difference or none! But bummer. Seems to be a well spread 2.2L RHD topic...
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Old 05-29-2013, 06:47 AM   #12
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I don't understand why a LHD and a RHD would make a difference. Isn't the engine and related components positioned the same?
Exhaust manifolds are bent slightly different to clear the steering column on RHD.
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Old 05-29-2013, 06:58 AM   #13
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Exhaust manifolds are bent slightly different to clear the steering column on RHD.
Thanks. I'll call BMW tomorrow and have them give me the part numbers to be certain then I'll ask how much and I won't be surprised this time.

I'll let you know in the morning.
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Old 05-29-2013, 10:56 AM   #14
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Hi, long post sorry but hopefully it has some good info.

I'm looking at replacing these too and hit exactly the same snag.
As E46 Coupe says, it's definitely a RHD thing and related to lead length, with our cars requiring 570/990mm for front/rear manifolds.

Dealer price will be even more nuts - I'm guessing $400 each at least.

These are the options I'm considering.

If you don't mind a bit of extra work, Bosch do a cheaper Universal Sensor that you presumably cut to the required length then terminate but they seem to be a max of 680mm which is still too short for for the longer 990mm one (11781437586).
http://au.bosch-automotive-shop.com/..._auth=iBj8O1UQ

The longer one is readily available from OS so you could in theory get one of these, and a universal one, assuming the actual sensors are the same and the only difference is lead length.

Logic suggests you could also just get 2x 990mm sensors and tuck the extra length away somewhere for the front manifold.

Or, NGK also make O2 sensors and their AU site lists the parts with the correct lengths. Not sure what they charge locally but you can get these on ebay from the UK at quite reasonable prices.

Or - o2sensors.com.au also list the correct parts and are a little bit cheaper but there is no mention of what brand the sensors are. Looking at the prices and lengths they quote, it sounds like they are also Bosch and the 570mm one is probably actually the 680mm Universal job.

On a similar note, all the DIY's seem to point to the post-cat sensor connectors being on top of the engine:
http://forum.e46fanatics.com/showpos...57&postcount=3

On my car, these plugs are not connected to anything.
I'm not planning to replace the post-cat sensors but where are these connected on our cars?

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Old 05-29-2013, 12:18 PM   #15
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Originally Posted by ubersaloon View Post
Hi, long post sorry but hopefully it has some good info.

I'm looking at replacing these too and hit exactly the same snag.
As E46 Coupe says, it's definitely a RHD thing and related to lead length, with our cars requiring 570/990mm for front/rear manifolds.

Dealer price will be even more nuts - I'm guessing $400 each at least.

These are the options I'm considering.

If you don't mind a bit of extra work, Bosch do a cheaper Universal Sensor that you presumably cut to the required length then terminate but they seem to be a max of 680mm which is still too short for for the longer 990mm one (11781437586).
http://au.bosch-automotive-shop.com/..._auth=iBj8O1UQ

The longer one is readily available from OS so you could in theory get one of these, and a universal one, assuming the actual sensors are the same and the only difference is lead length.

Logic suggests you could also just get 2x 990mm sensors and tuck the extra length away somewhere for the front manifold.

Or, NGK also make O2 sensors and their AU site lists the parts with the correct lengths. Not sure what they charge locally but you can get these on ebay from the UK at quite reasonable prices.

Or - o2sensors.com.au also list the correct parts and are a little bit cheaper but there is no mention of what brand the sensors are. Looking at the prices and lengths they quote, it sounds like they are also Bosch and the 570mm one is probably actually the 680mm Universal job.

On a similar note, all the DIY's seem to point to the post-cat sensor connectors being on top of the engine:
http://forum.e46fanatics.com/showpos...57&postcount=3

On my car, these plugs are not connected to anything.
I'm not planning to replace the post-cat sensors but where are these connected on our cars?

Excellent research. IIRC the universal o2 sensors received a mixed bag of reviews from this site and bimmerfest. I can't remember exactly why, but I would guess it's because they are not oem per se. I know Bosch is the oem supplier but perhaps it was because why be cheap if the correct length sensor was available for $20-40 more. If you live in the US that may be true but here in Australia the difference could be up to a few hundred dollars if you buy locally.

I'm also a firm believer that sensors need to be oem. These sensors seem to always pull a code due to mixture issues too. I don't want to worry about the make of my o2 sensor if I'm trying to track down a mixture code considering all the vac hoses that can go bad.

You also mentioned getting the sensor from eBay in the UK. I think I was able to track down the sensor I needed to the UK and it was a reasonable price for oem.

I never really looked at the post sensors and where they connect. I may have to check this out over the weekend or maybe someone with more knowledge about them will respond soon.

This is great info and I appreciate you sharing. Your right about the dealer, it's going to be like $400 bucks...

I hope this makes sense. I can't believe it's 2am...I need to get some sleep.
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Old 05-29-2013, 06:46 PM   #16
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Funny, I just checked what I bought for my car last time, and I use 2 x 11781437586 (L=990mm). This really leads me to think that the difference is really just lead length.
IIRC I still paid around ~$200 ea for Bosch sensors.
Tucking away the excess cable shouldn't be an issue just be sure not to burn it or get it caught IMO as it's double the length.
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Old 05-29-2013, 08:35 PM   #17
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LOL, you were up later than I was researching O2 sensors!
My wife asked me why I came to bed so late - I told her she didn't want to know.....
Then of course she demanded to know so I told her.
Her eyes quickly glazed over and she reluctantly agreed I was right.

Anyway, I've already decided to go with the 2x 990mm sensors because they are a much cheaper solution for OEM.

PerfectStorm01 - check your PMs.
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Old 05-29-2013, 08:39 PM   #18
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LOL, you were up later than I was researching O2 sensors!
My wife asked me why I came to bed so late - I told her she didn't want to know.....
Then of course she demanded to know so I told her.
Her eyes quickly glazed over and she reluctantly agreed I was right.

Anyway, I've already decided to go with the 2x 990mm sensors because they are a much cheaper solution for OEM.

PerfectStorm01 - check your PMs.
Sounds like my wife!


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Old 05-30-2013, 06:05 AM   #19
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Originally Posted by ubersaloon View Post
LOL, you were up later than I was researching O2 sensors!
My wife asked me why I came to bed so late - I told her she didn't want to know.....
Then of course she demanded to know so I told her.
Her eyes quickly glazed over and she reluctantly agreed I was right.

Anyway, I've already decided to go with the 2x 990mm sensors because they are a much cheaper solution for OEM.

PerfectStorm01 - check your PMs.
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Sounds like my wife!


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Old 05-30-2013, 07:21 AM   #20
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So this morning I called BMW and they wanted over $1000 for both o2 sensors, which they didn't carry and would have to source from Germany.

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