C32 faulty boost sensor, causes SC to cut out
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 343
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From: Taipei, Taiwan
C32 '02
C32 faulty boost sensor, causes SC to cut out
Symptoms happend about a month ago, when slightly accelerating from 45-65mph the sc would engage for a split second and suddenly cut off. Pressing the pedal to the floor the car would only accelerate ever so slowly. I knew the sc clutch has been disengaged for some reason, and NO CEL light. 
When i slowed the car down a bit and then hit the pedal again, everything would be back to normal, sc engaging and all, back pushed against seat. 
Today I finally got time to check it out and it turned out to be a small problem. STAR gave me a P0108 Error: Manifold Absolute Pressure Circuit High Input.
The part that got replace is designated as B28 in star service manual. EPC has the part no. A 004 153 33 28 . The old part has the same part number, so no updated parts.
Update: There is a new part no. P/N: A 005 153 72 28 Thanks OD!
Attached are the location of the sensor, part no. and some installation pictures. as you can see the sensor is actually located on the "charge air cooler"
Steps to change the boost sensor:
1) remove both air filters
2) remove the throttle body
3) remove the right intake manifold facing engine ( Driver side )
You will be able to use an extension wrench to remove the 2 screws holding the sensor.
After replacing the sensor and buttoning her back up, I took it out for a test drive. So far I cannot reproduce the SC cut out and acceleration is smooth as butter. I will test it out for a few more days and hook it up to STAR to see if there are any other error codes. Will update this post after. So there you have it.
When i slowed the car down a bit and then hit the pedal again, everything would be back to normal, sc engaging and all, back pushed against seat. Today I finally got time to check it out and it turned out to be a small problem. STAR gave me a P0108 Error: Manifold Absolute Pressure Circuit High Input.
The part that got replace is designated as B28 in star service manual. EPC has the part no. A 004 153 33 28 . The old part has the same part number, so no updated parts.
Update: There is a new part no. P/N: A 005 153 72 28 Thanks OD!
Attached are the location of the sensor, part no. and some installation pictures. as you can see the sensor is actually located on the "charge air cooler"
Steps to change the boost sensor:
1) remove both air filters
2) remove the throttle body
3) remove the right intake manifold facing engine ( Driver side )
You will be able to use an extension wrench to remove the 2 screws holding the sensor.
After replacing the sensor and buttoning her back up, I took it out for a test drive. So far I cannot reproduce the SC cut out and acceleration is smooth as butter. I will test it out for a few more days and hook it up to STAR to see if there are any other error codes. Will update this post after. So there you have it.
Last edited by ML500K; Nov 2, 2011 at 04:54 AM.
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Joined: May 2008
Posts: 340
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From: Indiana
Silver 02 C32 & White 05 CLK500
Thanks for the info
. Mine acts like its going to downshift and you hear the sc but then the car jerks and no sc. I hope the symptoms dont come back for you. I am going to probably do this myself too.
. Mine acts like its going to downshift and you hear the sc but then the car jerks and no sc. I hope the symptoms dont come back for you. I am going to probably do this myself too.
Thread Starter
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Joined: Dec 2008
Posts: 343
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From: Taipei, Taiwan
C32 '02
I'm guessing that the ecu doesn't think its that serious of an issue to make it a CEL. I've had my car modded for over about 2 years now so I was sure it wasn't a tune/modding issue. It just happened suddenly one day and it kept on happening about once a day or whenever i decide to hit it to pass a car, sometimes the sc cuts out sometimes its alright; we all kno how that feels when ur car doesn't perform as expected.
Thread Starter
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Joined: Dec 2008
Posts: 343
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From: Taipei, Taiwan
C32 '02
I'm glad its ok for now. Hope yours is the same issue. It felt like when i'm on the pedal, i feel a slight jerk for half a second ( sc still engaged ) then all of a sudden it feels like i'm putting the tranny in neutral, rpm going up but the car not accelerating, or rather very very slowly. worse that a NA engine. Seems like the ecu sort of put it in a "limp mode" without the CEL coming on.
Last edited by ML500K; Oct 31, 2011 at 08:31 PM.
Thread Starter
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From: Taipei, Taiwan
C32 '02
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From: Philadelphia, PA
2008 A8L, 2002 996TT X50, 2009 X5
I'm glad its ok for now. Hope yours is the same issue. It felt like when i'm on the pedal, i feel a slight jerk for half a second ( sc still engaged ) then all of a sudden it feels like i'm putting the tranny in neutral, rpm going up but the car not accelerating, or rather very very slowly. worse that a NA engine. Seems like the ecu sort of put it in a "limp mode" without the CEL coming on.
FWIW, I think that P0108 is the code that all of the 185 guys/gals get from time to time. Overboosting the stock MAP sensor capacity. Should be most likely to occur in cooler, drier weather and at lower elevation. I don't think it's harmful or damaging to the car, but you should see about datalogging your car and make sure your AFRs are good even during the most demanding conditions (i.e. WOT, max load through the highest gear you can safely test, probably 3rd).
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Member
Joined: Sep 2011
Posts: 167
Likes: 14
From: Hong Kong, China
2002 W203 C32 AMG / 1997 Toyota Corolla AE110
I m using iPhone (Rev) and Kiwi to monitor my IAT and it go over 100C, but the SC still function ok. I m guessing my apps detection having problem cause I m using a JB version
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Joined: Oct 2007
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From: Bay Area, CA
Volvo
Thats very intresting, if you have a look at my thread, there was an updated part number for MAP
https://mbworld.org/forums/c32-amg-c...r-part-ii.html
On the EPC when I looked when doing this project came up with a new p/n along with a few gaskets that were different. I went to the dealer and order the part number that was on the EPC, This is what I got,
P/N: A 005 153 72 28
https://mbworld.org/forums/c32-amg-c...r-part-ii.html
On the EPC when I looked when doing this project came up with a new p/n along with a few gaskets that were different. I went to the dealer and order the part number that was on the EPC, This is what I got,
P/N: A 005 153 72 28
Last edited by OverDrive; Nov 1, 2011 at 11:08 AM.
Thread Starter
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Joined: Dec 2008
Posts: 343
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From: Taipei, Taiwan
C32 '02
When the ECU decides to shut off the S/C, you're left with a low-compression 3.2L in a moderately heavy sedan. It's an absolute pig when trying to accellerate in that condition, no doubt... seat of the pants, feels like a car with less than 200 bhp. I don't think it's a "limp mode" per se, just a car designed for F/I with the F/I shut off.
FWIW, I think that P0108 is the code that all of the 185 guys/gals get from time to time. Overboosting the stock MAP sensor capacity. Should be most likely to occur in cooler, drier weather and at lower elevation. I don't think it's harmful or damaging to the car, but you should see about datalogging your car and make sure your AFRs are good even during the most demanding conditions (i.e. WOT, max load through the highest gear you can safely test, probably 3rd).
FWIW, I think that P0108 is the code that all of the 185 guys/gals get from time to time. Overboosting the stock MAP sensor capacity. Should be most likely to occur in cooler, drier weather and at lower elevation. I don't think it's harmful or damaging to the car, but you should see about datalogging your car and make sure your AFRs are good even during the most demanding conditions (i.e. WOT, max load through the highest gear you can safely test, probably 3rd).
I did my tuning in the dead of winter here and speeds of up to 150mph using real world data logging ( don't ask me where ) And i send my data back to Jerry to have it retuned. Did this about 3-4 times to get it right.
Last edited by ML500K; Nov 2, 2011 at 04:21 AM.
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 343
Likes: 3
From: Taipei, Taiwan
C32 '02
Thats very intresting, if you have a look at my thread, there was an updated part number for MAP
https://mbworld.org/forums/c32-amg-c...r-part-ii.html
On the EPC when I looked when doing this project came up with a new p/n along with a few gaskets that were different. I went to the dealer and order the part number that was on the EPC, This is what I got,
P/N: A 005 153 72 28
https://mbworld.org/forums/c32-amg-c...r-part-ii.html
On the EPC when I looked when doing this project came up with a new p/n along with a few gaskets that were different. I went to the dealer and order the part number that was on the EPC, This is what I got,
P/N: A 005 153 72 28
Gonna have it replaced today.
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 343
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From: Taipei, Taiwan
C32 '02
This happened at around 10psi and my IAT where about 40C / 104F. When I actually gun it, its ok, its only when pressing half way does this randomly occur.
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Joined: Sep 2011
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2002 C32 AMG
is it a faulty boost sensor?
hey guys i need advise from you on this issue:
car behaves normally all times until i smash it down full throttle on 2nd 3rd 4th gears it cuts gas totally doesnt accelerate anymore i press the pedal its empty and all i can do is park sbhut down restart and here it gors again...on 1st gear if im not goin sideways seems it doesnt do any problem...nota: car does function perfectly as long as i dont press the pedal fully or do a kickdown i even can go 200km/h without problem...any ideas???????plz help
i guess this exactly what u r talking about the boost sensor...it showe failure symptoms after a harsh driving night goin to speeds above 250 several times...opinions plz, any idea about the cost of this sensor?thnxx
car behaves normally all times until i smash it down full throttle on 2nd 3rd 4th gears it cuts gas totally doesnt accelerate anymore i press the pedal its empty and all i can do is park sbhut down restart and here it gors again...on 1st gear if im not goin sideways seems it doesnt do any problem...nota: car does function perfectly as long as i dont press the pedal fully or do a kickdown i even can go 200km/h without problem...any ideas???????plz help
i guess this exactly what u r talking about the boost sensor...it showe failure symptoms after a harsh driving night goin to speeds above 250 several times...opinions plz, any idea about the cost of this sensor?thnxx
Junior Member
Joined: Sep 2011
Posts: 17
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2002 C32 AMG
man i changed my ic pump two months ago surely not from it, and from driving experience a failing ic pump will shut down on 160 k or so and will fail on high revs i can go up to 5800 with no problem so thats why i eliminated that option..
Member
Joined: Dec 2008
Posts: 133
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From: Beirut Lebanon
C32AMG.335 e92 fbo.protomotive996 gt2
Hi Anas,get your car and i will see where is the problem,these cars are so simple...
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 343
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From: Taipei, Taiwan
C32 '02
