Mercedes E550 B28/7 pressure sensor downstream of throttle valve
Thread Starter
Newbie
Joined: Feb 2021
Posts: 14
Likes: 0
From: Palos Hills IL
2012 E550 4MATIC | 2008 E350 4MATIC
Mercedes E550 B28/7 pressure sensor downstream of throttle valve
Hello
Please help me to locate the sensor to fix the trouble code P010617
B28/7 "pressure sensor Downstream of the throttle valve
Part number if possible, and where this sensor is located.
Thank you
Please help me to locate the sensor to fix the trouble code P010617
B28/7 "pressure sensor Downstream of the throttle valve
Part number if possible, and where this sensor is located.
Thank you
Last edited by GregGuzik; Dec 18, 2021 at 04:56 PM.
MBWorld Fanatic!
Joined: Aug 2021
Posts: 1,539
Likes: 768
1983 Nissan Shltbox
Wow, it's literally on page 1 of threads. Does anyone do any research themselves anymore? Seems like all most know how to do anymore is ask someone else how to do something.
https://mbworld.org/forums/e-class-w...e550-m278.html
https://mbworld.org/forums/e-class-w...e550-m278.html
Thread Starter
Newbie
Joined: Feb 2021
Posts: 14
Likes: 0
From: Palos Hills IL
2012 E550 4MATIC | 2008 E350 4MATIC
Wow, it's literally on page 1 of threads. Does anyone do any research themselves anymore? Seems like all most know how to do anymore is ask someone else how to do something.
https://mbworld.org/forums/e-class-w...e550-m278.html
https://mbworld.org/forums/e-class-w...e550-m278.html
I did research, I found a similar topic but for AMG version. I was looking by trouble codes, not by MAP sensor issues and that was my mistake
Thank you!
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: May 2018
Posts: 6,607
Likes: 6,554
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Is the B28/7 you got as replacement a genuine one ?
1,111hpa of air pressure ( engine off ) means that is supposedly ambient pressure.
Normal condition , at sea level is 1,013 hPa or millibar or 101,325 Pa, same-same.
Your sensor is reading your engine being underground at -783 meters. Type in 111,100 Pa
https://www.mide.com/air-pressure-at...ude-calculator
1,111hpa of air pressure ( engine off ) means that is supposedly ambient pressure.
Normal condition , at sea level is 1,013 hPa or millibar or 101,325 Pa, same-same.
Your sensor is reading your engine being underground at -783 meters. Type in 111,100 Pa
https://www.mide.com/air-pressure-at...ude-calculator
MBWorld Fanatic!
Joined: May 2018
Posts: 6,607
Likes: 6,554
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
The B28/7 should read vacuum at idle or 370 to 450 hPa there about.
Was the old assumed defective B28/7 sensor also reading the same wacky value at idle ?
Turn engine OFF, keep ignition ON so ECM is running.
Try to use vacuum pump to exercise the membrane of B28/7. Who knows it is stuck.
Unplug B28/7 from its position and let it read ambient atmospheric pressure. Read the pressure value, it should read ambient pressure like all other MAP/Pressure sensors B28/4 , B28/5 and B28/6 are reporting. +- 3 or 4 hPa is okey.
Use vacuum pump to create vacuum to B28/7 and see does it come close to the vacuum gauge reading ( yes, you must convert )
If still B28/7 alone is reading funny/error, simplest way is to use the other MAP/pressure sensors to take place of B28/7 to confirm IF wiring to B28/7 is the problem or the sensor itself.
The closest specification would be the B28/6, but if reading ambient atmospheric pressure only, all other 3 sensors would surely match.
No need engine running, just read ambient pressure with engine OFF and ignition ON.
Good luck
Was the old assumed defective B28/7 sensor also reading the same wacky value at idle ?
Turn engine OFF, keep ignition ON so ECM is running.
Try to use vacuum pump to exercise the membrane of B28/7. Who knows it is stuck.
Unplug B28/7 from its position and let it read ambient atmospheric pressure. Read the pressure value, it should read ambient pressure like all other MAP/Pressure sensors B28/4 , B28/5 and B28/6 are reporting. +- 3 or 4 hPa is okey.
Use vacuum pump to create vacuum to B28/7 and see does it come close to the vacuum gauge reading ( yes, you must convert )
If still B28/7 alone is reading funny/error, simplest way is to use the other MAP/pressure sensors to take place of B28/7 to confirm IF wiring to B28/7 is the problem or the sensor itself.
The closest specification would be the B28/6, but if reading ambient atmospheric pressure only, all other 3 sensors would surely match.
No need engine running, just read ambient pressure with engine OFF and ignition ON.
Good luck
MBWorld Fanatic!
Joined: May 2018
Posts: 6,607
Likes: 6,554
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Good to hear you found the problem.
However : Wow.... that is a scarry boost manipulation value.
Assuming 1,111 hPa at idle represents the boost manipulation gross value (at sea level), that is approx 600 hPa or 0.6 BAR or 9 psi of extra ACTUAL turbo boost under reporting.
M278 DELA46 standard boost is 0.9 Bar ( 13psi ).... holy cow, 66% manipulated extra turbo boost.
I am wondering, piggy back black box like RaceChip manipulation method, where and when the manipulated data is injected ?
At idle surely it won't manipulate anything significantly...yet, otherwise DTC code willl be generated by the engine ECM for whacky values....as you are experiencing.
RaceChip can't manipulate orginal fuel/boost/ignition/etc mapping of your ECM, it can only under-report value of the sensors to the ECM.
Something has to give.... I think the CAT system will suffer in the long term if the cheat is too crude.
I guess the plastic intake manifold and aftercooler can handle extra 9psi of pressure ?
Turbo wise, I don't know if extra 9psi will shorten its life by X% ?
M271.860 of 184HP uses 1.2 BAR boost or 17.4 psi.
However : Wow.... that is a scarry boost manipulation value.
Assuming 1,111 hPa at idle represents the boost manipulation gross value (at sea level), that is approx 600 hPa or 0.6 BAR or 9 psi of extra ACTUAL turbo boost under reporting.
M278 DELA46 standard boost is 0.9 Bar ( 13psi ).... holy cow, 66% manipulated extra turbo boost.
I am wondering, piggy back black box like RaceChip manipulation method, where and when the manipulated data is injected ?
At idle surely it won't manipulate anything significantly...yet, otherwise DTC code willl be generated by the engine ECM for whacky values....as you are experiencing.
RaceChip can't manipulate orginal fuel/boost/ignition/etc mapping of your ECM, it can only under-report value of the sensors to the ECM.
Something has to give.... I think the CAT system will suffer in the long term if the cheat is too crude.
I guess the plastic intake manifold and aftercooler can handle extra 9psi of pressure ?
Turbo wise, I don't know if extra 9psi will shorten its life by X% ?
M271.860 of 184HP uses 1.2 BAR boost or 17.4 psi.
Last edited by S-Prihadi; Dec 19, 2021 at 02:07 AM.
Newbie
Joined: Jun 2025
Posts: 3
Likes: 0
From: AZ
12 S550
