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      03-01-2018, 08:14 PM   #1
Erik-AA
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DIY 128i O2 exhaust oxygen sensors

M 2010 128i is throwing repeated oxygen sensor codes. Not surprising at over 130k miles. To my surprise there is no guide to this that I can find in the forum.

I'll take photos and make a DIY guide if there isn't already one. But before I dive into it can anybody help me out a bit? I can't tell from the online info and the parts vendors whether the car has 2 or 3 or 4 sensors? Upstream for 1-3 and another upstream for 4-6? One or two downstream? I saw something about this being a big job on 135i, involving removing steering rack etc. Is that so for 128i too?

I'm inclined to replace them all while I'm in there since I'm in the right mileage range for them to fail and they're not that expensive. But the codes I'm getting are for downstream (after the cat) sensors and if the upstream sensors are a lot harder to get to I might leave them for now.

Thanks in advance for any advice!
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      10-16-2018, 02:50 PM   #2
Atomic Drifter
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O2 sensor

Erik,

Did you ever replace those O2 sensors? Mine is doing a similar thing.

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      10-17-2018, 09:56 AM   #3
JimD
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I have not tackled this on my 128i and do not currently have codes indicating an issue but I have avoided replacing the O2 sensor on other cars because of difficulty getting them out on prior cars. If you car doesn't get the O2 sensor signal, it has to resort to backup values to set the air fuel mixture. That can affect mpg and power. But the car will run. Usually it is not a complete loss of signal, the O2 sensor works most of the time, just not all the time.

If it is not rusted in place and you can get to it, it might not be a bad job. If it is rusted into the exhaust manifold and inaccessable, it can be pretty difficult. Can you see it?
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      02-20-2020, 04:03 PM   #4
Erik-AA
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I haven't done it yet. Too busy and the light mostly stays off. I did verify that there are four sensors, two (barely) visible from under the hood on the exhaust manifold, and two under the car after the cats. None of them look that easy to get to.

The exhaust system itself is good quality stainless steel, but some of the fasteners are another issue. The flanges and bolts that connect the back of the cats to the rest of the exhaust are very rusty. If any of the exhaust system needs to be taken apart to get to things, this is not going to be a fun job.

So being lazy and over-committed, I am putting it off.
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      02-20-2020, 06:20 PM   #5
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I just recently did mine on a 135i. Not that bad, don't have to remove anything but the belly pans. And I did have to cut the open end of a 7/8" wrench to about 6" long to get the room to turn the sensors. The 2 fronts or upstream ones are the ones that mostly go out. I'm guessing a 128 is similar in that area.
Definitely spray them with penetrating spray too
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      02-21-2020, 04:27 PM   #6
Rmtt
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If it helps....here is a pic of where they are in the OEM manifold. This was when I was installing headers.
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