vamkris30

Hi I bought a Merc E class CDI 250 Bluefficiency Avantgarde ED 125, it has done 58k on the clock. I could see an engine management light and when i took it to local garrage and the diagnostics have confirmed the DPF is faulty and Soot filter pressure sensor fault. Can you please confirm do we need to change DPF for such low mileage.

Plutoe

If you are looking for HS and guesses simply wait, however if you want a correct answer you will find someone with XDOS who will attach the diagnostics and in five minutes he will have a correct answer. It is an expensive part---choose wisely!!

decorily

You say your car has only 58k on the clock.

With regard to DPF it is not the mileage that matters but the 'type' of mileage.
DPFs don't cope well with city or short journey driving.

marc hanna

Is the car still under warranty? I agree with Pluto, you should get at proper diagnosis done, it could mean the difference between a $100 repair and a $4,000 repair.

decorily

[QUOTE=marc hanna;7221912]Is the car still under warranty? I agree with Pluto, you should get at proper diagnosis done, it could mean the difference between a $100 repair and a $4,000 repair.[/QUOTE

Is that not a "proper diagnosis"?

marc hanna

Well, just using a typical scanner may not accurately diagnose a DPF failure. Your car is pretty low mileage, so I question a faulty DPF. It's more likely a bad sensor such as the pressure differential sensor or one of the air lines connected to it.

I got the impression from your post that the mechanic was recommending a DPF replacement, which is pretty extreme. So, I'm not sure if they just scanned it with their OBD2 scanner, which may or may not have the full propriety codes in it or if they did more investigation; i.e. blow out the pressure differential lines, clear code, reconnect, and see if the error returns.

Also, did think give you a print out or list of the stored codes?

BenzKraft

Any luck with this? The mileage seems low to have your DPF acting up unless it is just the sensor that is faulty. If it is the DPF that's faulty it could be due to the wrong oil or fuel being used or that oil has been getting into the intake/exhaust gumming things up. These cars need ultra low sulphur diesel and the right spec of oil to run properly. Problems with the DPF are either soot build up because it's not regenerating itself (i.e. converting soot to ash) or ash build up from the active/passive regeneration process. In both cases the DPF can be cleaned out preemptive to replacing it completely. If the problem is soot build up it can be as easy as spraying DPF cleaner in through the differential pressure port in order to force the regeneration of soot to ash and allowing the DPF to breathe once again. If the problem is ash build up (which is less likely due to your mileage) then the DPF has to be cut open and the ash removed then re-welded and sealed. Look for a shop in your area that does such a service. Cheer!

Plutoe

Very bad advice to spray anything into the DPF---this sounds like one of those glad handing Ben's Wurld advice--that is one quick way to ruin the expensive DPF


Simply take the car to an auto pisto and run the car at 75 for a half hour.

BenzKraft

I agree, you don't just "spray anything" into the DPF, it has to be "DPF Cleaner". A little research (google or YouTube "DPF Cleaner") will show that it's a very common procedure to activate the regeneration process... or you can try the good 'ol "Italian tune up" as you suggested.

Plutoe

I use the Webster definitions, not any= not any! nothing left to interpretations.