Dpf blocked.

ncarey265

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Hi can anyone help me. My engine management light come on today and went into limp mode I called the rac who plugged it in and shown the dpf was blocked or partially blocked.

Will I be able to do a force regen or will a regen not happen now the light is on and in limp mode? And can somebody tell me how to do a force regen thanks.

I have a 2014 c220 blutec w205.
 

LostKiwi

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You'll need to take it to somewhere with Star to do a forced regen.

Why did it not regen itself is a question I'd be wanting the answer to.
 
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ncarey265

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So it will not regen itself now the light is on?

Rac reckon it's a mixture of town driving. And also not having enough fuel in the car for a regen to kick in. Apparently I need at least qtr of a tank for a regen to kick in and it's very rare I have over a qtr of a tank as I only put £20 a week fuel in.
 

LostKiwi

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It will not do a regen by itself as long as it's in limp mode.
 
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ncarey265

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Ok so what's my options here to get it out of limp mode so a regen can happen.
 

LostKiwi

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As above. Take it to someone with Star.
 

Rappey69

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As lostkiwi states, you only option is to go to someone with star.
My dpf pressure sensor failed so no regen could take place.
According to star my dpf was 400% full, but I didn't get a dash warning light and car drove ok.
Would be very interested what percentage full yours is !
I now do short journeys but put it in sports mode so it revs higher in each gear and once warm put my foot down more, not high rpm but more acceleration.
Many months later and the dpf is barely full when measured !
 

A.J.

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I am so pleased I switched to Petrol. Most of my trips are short ones within the town and local area. The only thing I have to be mindful of is that the battery is sufficiently charged so I may not always take the most direct route. :rolleyes:
 

mersum1es

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it could be sensor fault (or blocked sensor channel fault) too, but like said, SDS is the best route to continue
 

mrmb

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It can be lots of things. The bet to avoid spending money left and right is to plug the car to Star Diagnosis and it will tell you exactly where to look for the problem. DPF is quiet big system and to work properly it reads the info from multiple sensors at the time.
 

Capra

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Do you not get any warnings to say that you need to take the car for a long drive? My friend had a warning on his land rover to say that the DPF needed a regen.
 

Srdl

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Rac reckon it's a mixture of town driving. And also not having enough fuel in the car for a regen to kick in. Apparently I need at least qtr of a tank for a regen to kick in and it's very rare I have over a qtr of a tank as I only put £20 a week fuel in.
The RAC are right and you really shouldn’t be driving a diesel with that sort of useage.
Do you not get any warnings to say that you need to take the car for a long drive? My friend had a warning on his land rover to say that the DPF needed a regen.
as far as I know, Mercs don’t give any DPF warnings unlike some other brands.
Ok so what's my options here to get it out of limp mode so a regen can happen.
Let us know where you are and perhaps someone can recommend a local Indie with Star
 

M80

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The RAC are likely spot on woth their diagnosis, but since you will need Star to force a regen it's worth asking them to confirm all sensors are feeding the ECU while their at it.
 

400ixl

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Town driving is not necessarily an issue, its when it is combined with only short journeys. Do 20-30 minutes of town driving and it can still do a regen. Do a 10 minute journey and no longer journeys and you will have an issue.
 

malcolm E53 AMG

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When looking at the type of use a modern Diesel engine gets it’s worth noting that short journeys from cold of 10 minutes or less will not get the engine temperature up to a point where the ECU will force a regeneration and a plug into STAR is required to initiate the procedure.

Judging by my own experience and the lack of problems relating to clogged DPFs on the forum I would say that the MB system works very well generally and other than the occasional pressure sensor going down the main problems relate to the car user not understanding the nature of modern vehicles equipped with the system.

This can be jointly blamed on manufacturers, franchises and traders not wanting to loose a sale by educating the buyer about the pitfalls of short journeys after all it’s win win for them they get a sale and pick up more work by sorting out the faults caused

As an aside it’s easy to tell when a regen starts on the OM642 engine the car revs rise to 800rpm minimum and the exhaust note becomes raspier due to the extra injected fuel burning off the soot in the DPF and if I can I run the vehicle until the regen stops a bit OCD I know but I do quite a lot of short journeys
 

Srdl

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the main problems relate to the car user not understanding the nature of modern vehicles equipped with the system.

This can be jointly blamed on manufacturers, franchises and traders not wanting to loose a sale by educating the buyer about the pitfalls of short journeys after all it’s win win for them they get a sale and pick up more work by sorting out the faults caused
No one ever told me about DPFs when I bought my C207 back in 2010 even though I was changing from a BMW petrol. The first I heard about it was when I joined this forum and, when I checked, there was no mention of it in the Manual. Fortunately, I never had a problem with mine but I’m glad I'm back on petrol now.
 

malcolm E53 AMG

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No one ever told me about DPFs when I bought my C207 back in 2010 even though I was changing from a BMW petrol. The first I heard about it was when I joined this forum and, when I checked, there was no mention of it in the Manual. Fortunately, I never had a problem with mine but I’m glad I'm back on petrol now.

Totally agree - it’s the nature of capitalism nowadays unfortunately everyone seems complicit even government agencies
 

Capra

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No one ever told me about DPFs when I bought my C207 back in 2010 even though I was changing from a BMW petrol. The first I heard about it was when I joined this forum and, when I checked, there was no mention of it in the Manual. Fortunately, I never had a problem with mine but I’m glad I'm back on petrol now.
Our company car policy only uses diesels, and you could be someone that works from home and hasn't commuted for years.
 

Blobcat

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No one ever told me about DPFs when I bought my C207 back in 2010 even though I was changing from a BMW petrol. The first I heard about it was when I joined this forum and, when I checked, there was no mention of it in the Manual. Fortunately, I never had a problem with mine but I’m glad I'm back on petrol now.
To be fair the VeeDub dealer I bought my Caravelle from mentioned it along with how to keep it healthy, obviously did as I never had an issue with it in over 100K miles - It used to stink like mad when doing a burn off but never any warnings or engine issues.
 

Capra

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To be fair the VeeDub dealer I bought my Caravelle from mentioned it along with how to keep it healthy, obviously did as I never had an issue with it in over 100K miles - It used to stink like mad when doing a burn off but never any warnings or engine issues.
You certainly know when it's doing it's thing.
 


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