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^ greaaaaaaaaaaaaaaaat. Thanks for the heads up.

I'll check when she gets home. Hopefully it's the same, her cars build date is in '04.

Thanks again
yeah sorry---mine is an 04 w/03 build date and I had the old style sensors. I have found a lot of stuff on my car that is 03 vs 04.... You can check pretty easily, just pull one of the plugs out of the holder and see if it matches up.
 

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Just changed out the 2 pre-cats on my '99 w/137k using this DIY and video. Everything went off without a hitch.

Ordered 4 of the Bosch 13477s' from Amazon and picked up the O2 socket from Advanced Auto. Next up is the wifes '05 w/77k pre-cats. I checked with realoem and it uses the same Bosch #.

Thanks for the great tutorial r0x and thanks for the video Solidjake :thumbsup:
double check your wifes sensors actually in the car....I would think her 05 would need the 5 wire ones...despite what real oem says...

jgold47, turns out realoem was correct ... they matched. Depending on the item, I'll be sure to double check on future orders. Thanks.
 

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Anyone, is there a DIY for the post-cat ones? I am in the process of doing all four and ran into problems taking off one of the post-cat o2 sensors. The problem is that the socket does not fit there. I am having problems finding a tool that does fit. The two exhaust pipes come real close where one of the o2 sensors is and about the only thing I had to fit inbetween the two exhaust pipes was a flat wrench. I had to grind it out to the opening for the o2 sensor but that made it too weak and broke. I am now looking for another such wrench. Anyone had this kind of problems? Please point me in the right direction.
 

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Hello again, I seem to be running into more problems. The sensors I bought looked like they were the same ones, until I installed one (so far). The connectors are the same but inside the keying is different. Why? I had to cut the connector from the old one and spice it into the new sensor. It ran, but more problems; it was smoking when I brought it back. I am thinking one of the wires from one of the sensors is making contact with the engine block. This is where I am presently. Also, when I turned off the car there is a noise after which sounds like it is getting air from somewhere. I had replaced the boot previously, and I thought everything there was ok. It maybe there where the problem is all along. I will troubleshoot that. Does anyone know which way the sensor leading out of the air filter goes? The sensor towards the inside of the filter or towards the outside.
 

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Got around to replacing my pre-cat O2 sensors today with Bosch #13477 as preventative maintenance, courtesy of this thread, and wow - the new sensors in comparison to the old ones (which could quite possibly be over 150K miles old) are truly night and day. I was able to get away with using slightly smaller socket extensions (3***8221; and 6***8221; put together), but of course everyone's mileage may vary. Upon finishing the DIY, I was only able to drive about 10 or so miles but I***8217;ve already noticed much better lower-end torque and a smoother idle (and it was already pretty good before replacing the O2 sensors in the first place). I***8217;m sure the long-term effects will give me better gas mileage, as well as other improvements. Thanks for this, still a very helpful thread even after 7 or so years later.
 

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Thanks very much for the DIY...finished mine off this morning...will have to see what the impact is on fuel economy.

Here's a pic of my old ones and a new one.

For better access to the front sensor I recommend unbolting the Air Pump and moving it forward out of the way (someone else mentioned this). You can see from the picture how much room that gives you.

For anyone who is waiting to do this because of the high cost check out this link at Amazon.com. They are selling Bosch O2 sensors with the correct OEM length and plug for only $49 - no excuses.

http://www.amazon.com/Bosch-13477-Oxygen-Sensor-Fitment/dp/B000GZEK00/
 

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Hi there,

I have a BMW E46 323 Convertible.

I need to replace those two front lambda sensors. Do they have the same part number? I did not find any info regarding any differences/similarities between the front sensors.

Cheers
 

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Hi there,

I have a BMW E46 323 Convertible.

I need to replace those two front lambda sensors. Do they have the same part number? I did not find any info regarding any differences/similarities between the front sensors.

Cheers
Have you tried RealOEM to get the part number?
www.realoem.com
 

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Thanks very much for the DIY...finished mine off this morning...will have to see what the impact is on fuel economy.

Here's a pic of my old ones and a new one.

For better access to the front sensor I recommend unbolting the Air Pump and moving it forward out of the way (someone else mentioned this). You can see from the picture how much room that gives you.

For anyone who is waiting to do this because of the high cost check out this link at Amazon.com. They are selling Bosch O2 sensors with the correct OEM length and plug for only $49 - no excuses.

http://www.amazon.com/Bosch-13477-Oxygen-Sensor-Fitment/dp/B000GZEK00/
I just did both pre-cats, and it was very straight forward. I only removed the air pump PLUS the bracket from the shock tower. Did not have to remove the cabin air filter, engine cover etc.

The front sensor was super easy, the rear one a little harder to get to. I bought a crow's foot wrench, which worked, but if I had it to do over again I would probably get the socket style.
 

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Does the 13477 work for both pre and post-cat? I know it works pre-cat.

Any reason to do the post-cats if my car is not having a problem failing emission inspection? I read earlier they are mainly for emissions, but then others are writing they got some codes thrown until they replaced all four.

Are the post-cat ones as easy as the pre-cat? Anyone have a link to a DIY? I think this was asked a couple of times.
 
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