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      11-06-2020, 08:56 PM   #45
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Quote:
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Quote:
Originally Posted by Adi123 View Post
It's a 15 $ fix! Got the sensor out very easily. Remove the torxscrews on the sensor, unbolt the ABS and make some space. Pull the sensorcable and you got it in your hands!

I checked the numbers on my pressure sensor and found a MAP sensor from a Z4 with the exact same number on eBay for 15$ (besides the production date). Immediately I heard that the pump stoped working overtime. Have been driving it for 3 days now, no codes, no limpmode
Any new feedback? Did this Z4 MAP sensor permanently fix the brake vacuum sensor problem?
I would imagine it did. See my thread where I did something similar earlier this year. I used a sensor from a diff pressure sensor on newer cars. All that matters is the numbers match on the sensors. They may have different part numbers but the sensors used are the same

27E4 Brake Vacuum Sensor GOOD NEWS https://www.m3post.com/forums/showthread.php?t=1714625
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      11-06-2020, 09:17 PM   #46
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Nice! $20 sensor vs $200 pressure hose is a huge savings!
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      11-17-2020, 08:28 PM   #47
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Great help. Used a magnet extractor next to the torx because Amazon sent me the wrong torx (non magnetic). All smooth, also used the $20 sensor. Really went very smooth. Used a long reach pliers and bit of a coat hanger but didnt take anything apart.
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      12-07-2020, 11:55 AM   #48
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Hi All,

I am having similar issues on my car but the code thrown is P1209. Recently changed brake pads and rotors and noticed that the fluid spilled and now I get a loud buzzing noise from the brake pump and limp mode. Will replacing the sensor fix this? Can anyone confirm? Also does someone have the link for the sensor? TIA.
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      12-07-2020, 12:25 PM   #49
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Different application, but same exact sensor and much cheaper.

https://www.fcpeuro.com/products/bmw...or-13628617097

If fluid spilled on it, it is definitely your issue.
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      12-14-2020, 01:23 PM   #50
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Quote:
Originally Posted by Redd View Post
Any new feedback? Did this Z4 MAP sensor permanently fix the brake vacuum sensor problem?
Yes it did Everything works just like before. For those who are worried about if it will solve their issue, just try it before replacing anything else for 200$
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      12-15-2020, 10:19 AM   #51
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Different application, but same exact sensor and much cheaper.

https://www.fcpeuro.com/products/bmw...or-13628617097

If fluid spilled on it, it is definitely your issue.
That was it. I ordered the $20 sensor from Amazon as mentioned in an earlier post and it worked like a charm. Overall took me about an hour start to finish. No more buzzing sound and no more limp mode . Thanks.
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      03-30-2021, 11:08 AM   #52
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Reviving this thread to say that I ordered the whole hose+sensor, getting same code, 27e4. I can't go past 4500 RPM otherwise Limp mode. SES comes on and off randomly.

Will fix sensor, check fuses and report back, this thread helped me out a lot so just in case someone else stumbles upon this, it'll help them too.


Edit: if anyone is having the same issue, the sensor fixed it. My old sensor's gasket was pretty bad, which I assumed was the culprit. Amazing how a tiny gasket can completely cripple my entire engine.

Wish anyone luck who might stumble upon this amazing thread like I did. Removing the sensor was about as hard as putting it on. Two people makes it so much easier. My dad helped me and man I think he had fun lol.
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      04-05-2021, 03:24 PM   #53
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I did this yesterday. I'm wondering what the little gasket on the sensor is made of and if it'd be less expensive just to replace the gasket than buy a new part (I bought a new part on amazon for like $17). Brake Fluid is glycol ethyl, is that right? There appear to be some rubbers that are resistant to glycol ethyl, like EPDM - so what is the sensor's gasket made out of, and would it work if we just swapped out the gasket or O-ring for one made of something else. Anyone have any ideas?
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      04-05-2021, 03:29 PM   #54
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I did this yesterday. I'm wondering what the little gasket on the sensor is made of and if it'd be less expensive just to replace the gasket than buy a new part (I bought a new part on amazon for like $17). Brake Fluid is glycol ethyl, is that right? There appear to be some rubbers that are resistant to glycol ethyl, like EPDM - so what is the sensor's gasket made out of, and would it work if we just swapped out the gasket or O-ring for one made of something else. Anyone have any ideas?
In most cases it is not the o-ring that is the issue. If even a couple of drops of brake fluid weep onto the wiring connection it shorts the sensor out. For whatever reason it is extremely sensitive. Glad you got it swapped and I assume it cured your problem.
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      04-05-2021, 05:02 PM   #55
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In most cases it is not the o-ring that is the issue. If even a couple of drops of brake fluid weep onto the wiring connection it shorts the sensor out. For whatever reason it is extremely sensitive. Glad you got it swapped and I assume it cured your problem.
Thank you! Your remark about it being a job that requires some finesse kept popping into my head. I felt like I was playing "Operator" (the Milton Bradley game) while trying to remove screws with magnet telescoping thingy - sometimes the magnet wants to stick to something else and twice I dropped a screw down down down into the hole (I was able to retrieve them).

My damaged part looked just like someone else's in this thread - the o-ring was beat up and fraying.

But, on thinking on it now there, there was a good amount of vacuum suction noise as I removed the part, so I suppose that you're right and the o-ring wasn't the problem. huh.

The part I bought was cheap and made in china so I hope it lasts, I don't want to do this replacement again lmao.

I found that a wire hanger was pretty useful, as was the large flathead screwdriver to move the part so that I could better access the screws to unscrew and re-screw it down: Actually the flathead was essential, being able to move this thing a bit is really helpful. I also unbolted the ABS and lifted it over its mounting screws which gave me a bit more room, as did un-snapping the firewall on the other side where the vacuum tube passes through it, that gave me some more angles to work with. Definitely needed a flashlight even though I was working in broad daylight.

Later I was trying to picture what kind of hypothetical tool we could create that would make this job much easier, like some kind of metal angled tounge-depresser with a hole in it to match the nub on top of the sensor, that you could slip under the master cylinder and hook the sensor and then pull it over the tube and press it down. But I suppose the screwdriver and hanger and just time is enough.

I'll add that I did wonder why a part that's so sensitive to brake fluid is so difficult to get to and is located right under the master cylinder which is, of course, all filled with brake fluid;
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      06-01-2021, 09:48 PM   #56
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What are the chances of the sensor going bad after the brake fluid overflow? I found a small puddle near the front jack stand and traced it back to the reservoir after changing all 4 pads. I looked at the sensor and it doesn't look wet including where it plugs into the wires. Where does it get shorted?
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      01-19-2022, 07:43 AM   #57
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Great thread, thank you! Recently picked up an e90 and have been hearing an intermittent humming/vibrating under dash/in front fender....searching led me here and believe it is a bad sensor, no codes yet. I ended up ordering the hose from my local dealer that has the sensor on it.

Is it easier to just replace the entire hose or just the sensor? I'll tackle it over the next few days....
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      01-19-2022, 04:50 PM   #58
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Quote:
Originally Posted by 2011e91 View Post
Great thread, thank you! Recently picked up an e90 and have been hearing an intermittent humming/vibrating under dash/in front fender....searching led me here and believe it is a bad sensor, no codes yet. I ended up ordering the hose from my local dealer that has the sensor on it.

Is it easier to just replace the entire hose or just the sensor? I'll tackle it over the next few days....
You only need to do the sensor.

I'd take back the part you bought and just buy part # 13628657300. Its labeled as a diff pressure sensor but its the same sensor on the overly priced entire hose assembly. I think oem is like $85 and oe is $50.
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      01-19-2022, 06:54 PM   #59
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Quote:
Originally Posted by k_mann View Post
Quote:
Originally Posted by 2011e91 View Post
Great thread, thank you! Recently picked up an e90 and have been hearing an intermittent humming/vibrating under dash/in front fender....searching led me here and believe it is a bad sensor, no codes yet. I ended up ordering the hose from my local dealer that has the sensor on it.

Is it easier to just replace the entire hose or just the sensor? I'll tackle it over the next few days....
You only need to do the sensor.

I'd take back the part you bought and just buy part # 13628657300. Its labeled as a diff pressure sensor but its the same sensor on the overly priced entire hose assembly. I think oem is like $85 and oe is $50.
thank you, unfortunately already committed to the complete unit but before I tear into it I was wondering if it's easier to deal with the few plugs of replacing the hose or if it's easier to just replace the sensor? I've looked but couldn't find a DIY of replacing the hose itself.

I say to myself how difficult can 3 plugs be; famous last words??
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      01-19-2022, 07:02 PM   #60
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Quote:
Originally Posted by 2011e91 View Post
Quote:
Originally Posted by k_mann View Post
Quote:
Originally Posted by 2011e91 View Post
Great thread, thank you! Recently picked up an e90 and have been hearing an intermittent humming/vibrating under dash/in front fender....searching led me here and believe it is a bad sensor, no codes yet. I ended up ordering the hose from my local dealer that has the sensor on it.

Is it easier to just replace the entire hose or just the sensor? I'll tackle it over the next few days....
You only need to do the sensor.

I'd take back the part you bought and just buy part # 13628657300. Its labeled as a diff pressure sensor but its the same sensor on the overly priced entire hose assembly. I think oem is like $85 and oe is $50.
thank you, unfortunately already committed to the complete unit but before I tear into it I was wondering if it's easier to deal with the few plugs of replacing the hose or if it's easier to just replace the sensor? I've looked but couldn't find a DIY of replacing the hose itself.

I say to myself how difficult can 3 plugs be; famous last words??
I have done a few for others, but only once with the hose assembly. Definitely easier to replace just the sensor In my experience. As long as you have the right surgical tools, it can be done in 30 minutes or less!
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      01-19-2022, 08:50 PM   #61
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Quote:
Originally Posted by Dpc2u View Post
Quote:
Originally Posted by 2011e91 View Post
Quote:
Originally Posted by k_mann View Post
Quote:
Originally Posted by 2011e91 View Post
Great thread, thank you! Recently picked up an e90 and have been hearing an intermittent humming/vibrating under dash/in front fender....searching led me here and believe it is a bad sensor, no codes yet. I ended up ordering the hose from my local dealer that has the sensor on it.

Is it easier to just replace the entire hose or just the sensor? I'll tackle it over the next few days....
You only need to do the sensor.

I'd take back the part you bought and just buy part # 13628657300. Its labeled as a diff pressure sensor but its the same sensor on the overly priced entire hose assembly. I think oem is like $85 and oe is $50.
thank you, unfortunately already committed to the complete unit but before I tear into it I was wondering if it's easier to deal with the few plugs of replacing the hose or if it's easier to just replace the sensor? I've looked but couldn't find a DIY of replacing the hose itself.

I say to myself how difficult can 3 plugs be; famous last words??
I have done a few for others, but only once with the hose assembly. Definitely easier to replace just the sensor In my experience. As long as you have the right surgical tools, it can be done in 30 minutes or less!
Thank you, replacing the sensor it is!
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      01-21-2022, 02:38 PM   #62
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Mission accomplished! The car is new to me so still learning details but took about an hour replacing just the sensor without removing anything but the cabin filter cover and the tray underneath. Did not touch the abs block, master cylinder or plastic divider. Stuffed a bright colored rag underneath the sensor/hoses to catch anything and also helped viewing. Someone else mentioned it was like playing Operation, very true.

The dealer I purchased the car from last month replaced the front brake rotors and pads; sure enough the sensor was wet from brake fluid which apparently caused the failure and subsequent intermittent running of the pump. I wasn't getting any error codes.

There was residue vacuum in the hose (could hear it as I removed existing sensor) so the failure seems to be the senor itself, not the gasket.

Thank you!
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      01-21-2022, 05:01 PM   #63
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Mission accomplished!
Well done! 🧰🔧
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