C204 2011 Exhaust Back Pressure & Boost Pressure Sensor

tgl3

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063940AF-15CB-4A3C-8579-FCBEC01C593B.jpeg 6A2FBD70-9909-4541-94E6-43FA4ABCB008.jpeg Hi guys,

I’ve recently bought my 2011 C-Class C220 CDI Coupe. Everything works fine until yesterday the Engine Management Light came on, so I sent the car to my local Halfords to check it and then two error codes were found (P047128 & P024028), which indicates that the Exhaust Back Pressure Sensor 1 and the Boost Pressure Sensor for the low-pressure turbocharge have malfunctions (As the photo shown). Strangely, according to the receipt provided by the previous owner, the pressure sensor seem replaced two months ago (receipt photo uploaded) which unlikely to have malfunction at such a short time. As Halfords don’t know the exact cause of this so I took the car to another local garage with good reputation to seek a second opinion, they told me that it might be something wrong with the DPF probably because it’s clogged, and they advised me to have a DPF clean.So today I brought my car back to Halfords to have a “DPF Flush” service they provided and speak to the mechanic about this, the Halfords mechanic however told me that the DPF clean is highly unlikely to work and rather suggested the car may need a new DPF. Now I’m really confused and don’t know what to do; if the replacement is really required I know the cost is hefty but anyone has any experience on that can tell me the approximate cost for that work?

The car now has 139,000 mls on clock and the only symptom leads me took the car to check is that the Eco mode (Auto Start/Stop) isn’t working. Few seconds after the ignition on the Eco light on the centre console and also the Eco symbol shown on the dashboard will disappear, neither yellow or green Eco symbol will be shown. No limp mode and I can’t really find any other symptom...

Thanks guys in advanced for any help given!!!
 
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onefortheroad

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When the ebps fails it will probably throw the boost pressure fault. I'd replace the ebps first . It's a quite common fault . Around 50 quid at mb.
 

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Mother of God , Halfords want to guess at putting a new dpf in :shock: . That sounds truly expensive .
Where do you live so that someone can recommend a decent MB Independent with access to Star diagnostics that should more accurately pinpoint the problem (and who also knows these cars )
 

onefortheroad

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Does the scanner you used give live data ?

Correction. I see halfords did the scan .. I'd steer clear of halfords they are only good for wipers and bulbs.
 

LostKiwi

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As above get a proper MB indy to look at it.
Be aware that while this issue is present the car will probably not do a regen but an indy with Star will be able to do a forced regen if necessary - something Halfords will not be able to do.
 
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tgl3

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Mother of God , Halfords want to guess at putting a new dpf in :shock: . That sounds truly expensive .
Where do you live so that someone can recommend a decent MB Independent with access to Star diagnostics that should more accurately pinpoint the problem (and who also knows these cars )
Thanks so much mate:) l live in Coventry. Any good recommendation?
 
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tgl3

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When the ebps fails it will probably throw the boost pressure fault. I'd replace the ebps first . It's a quite common fault . Around 50 quid at mb.
Really appreciate for your advice mate:) I’m looking for a reliable MB specialist in my local area to look out the root of issues. Hope it’ll be sorted for just 50 quids instead of replacing the whole DPF!!!
 

onefortheroad

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Really appreciate for your advice mate:) I’m looking for a reliable MB specialist in my local area to look out the root of issues. Hope it’ll be sorted for just 50 quids instead of replacing the whole DPF!!!

None of the faults relate to the dpf. Worst case is a clogged inlet manifold. Imo.
 
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tgl3

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None of the faults relate to the dpf. Worst case is a clogged inlet manifold. Imo.
Sorry to ask but how much will cost to replace the clogged inlet manifold if it can’t be fixed? Do you have any idea? Hope it’ll not be so expensive to do so...
Finger crossed.
 

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Yep , what LK^ said . Good luck , let us know how you get on
 
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tgl3

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Yep , what LK^ said . Good luck , let us know how you get on
I've visited Mercland and they are quite busy at this moment and fully booked. So they booked me in for the next week; will let you know whats going on once they give a full diagnosis over the car.
Cheers!
 
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tgl3

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Hi guys,

hope all of you enjoyed a lovely weekend!

This morning the car has been checked by mechanics and something strange happened; when they plugged in the OBD scanner this morning, they could only find the error code for the Boost Pressure Sensor but not the code for the exhaust back pressure sensor. Could it probably be relevant to those DPF cleaning works done last week? Last week I sent the car to Halfords to have a DPF flush (“DEEP” clean as they said) and put a bottle of Redex DPF cleaner into fuel tank afterwards , following by an 100 mls journey on motorway to have it worked.

For the boost pressure code, they told me that there are two sensors needed to be replaced, one near the turbocharge and one near a manifold (not sure which one it is). I doubt if it is really the sensor issues or probably something more deeply has issues but not discovered.

It’ll be great if you guys can give some opinions thanks!!
 

onefortheroad

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The sensor near the turbo is the back pressure sensor . The other is the map sensor for turbo boost in the inlet trunking. What you need to be aware of if 1 component fails or faults out it can create a daisy chain . Best thing is to clear logged faults and see if they return. As I said in the beginning if the exhaust pressure sensor faulted chances are the boost for turbo dropped off and that sensor logged a code. Alot of codes are simply moments of pixie dust and madness and dont always mean parts are bad. Thats when live data readings help.
 
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tgl3

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was it Mercland who checked it?
It’s done by my dealer; last week I couldn’t book an immediate appointment with Mercland and they suggested me to send it back to my dealer as it’s just been bought for a while.
 

coyotitko

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Similar issue here . have trouble with my w204 c220 . Have sometimes slow acceleration , shifts at high rpm and lack of power until I restart car . It doesnt happen every time , just sometimes. Code reader shows error p047128 exhaust back pressure sunsor values out of range. Has been replaced for genuine mercedes sensor but still throwing code and have problems
103309088-930721714015955-668861921827033381-o.jpg

TbKvrg3
 

Efi

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The problem is fixed??
 

Efi

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View attachment 58636 View attachment 58637 Hi guys,

I’ve recently bought my 2011 C-Class C220 CDI Coupe. Everything works fine until yesterday the Engine Management Light came on, so I sent the car to my local Halfords to check it and then two error codes were found (P047128 & P024028), which indicates that the Exhaust Back Pressure Sensor 1 and the Boost Pressure Sensor for the low-pressure turbocharge have malfunctions (As the photo shown). Strangely, according to the receipt provided by the previous owner, the pressure sensor seem replaced two months ago (receipt photo uploaded) which unlikely to have malfunction at such a short time. As Halfords don’t know the exact cause of this so I took the car to another local garage with good reputation to seek a second opinion, they told me that it might be something wrong with the DPF probably because it’s clogged, and they advised me to have a DPF clean.So today I brought my car back to Halfords to have a “DPF Flush” service they provided and speak to the mechanic about this, the Halfords mechanic however told me that the DPF clean is highly unlikely to work and rather suggested the car may need a new DPF. Now I’m really confused and don’t know what to do; if the replacement is really required I know the cost is hefty but anyone has any experience on that can tell me the approximate cost for that work?

The car now has 139,000 mls on clock and the only symptom leads me took the car to check is that the Eco mode (Auto Start/Stop) isn’t working. Few seconds after the ignition on the Eco light on the centre console and also the Eco symbol shown on the dashboard will disappear, neither yellow or green Eco symbol will be shown. No limp mode and I can’t really find any other symptom...

Thanks guys in advanced for any help given!!!
the problem for P047128 is fixed?
 

Efi

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Similar issue here . have trouble with my w204 c220 . Have sometimes slow acceleration , shifts at high rpm and lack of power until I restart car . It doesnt happen every time , just sometimes. Code reader shows error p047128 exhaust back pressure sunsor values out of range. Has been replaced for genuine mercedes sensor but still throwing code and have problems
103309088-930721714015955-668861921827033381-o.jpg

TbKvrg3
the problem for P047128 is fixed?
 


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