DPF question

[lordlee]

The EML light came on in our E350 CDI - had the code read and it’s DPF. We’ve not been far in the car recently so we know why it’s got to this point - job change has meant hardly any long runs.
Anyway our mechanic reset the code and told me to go for a long run. I gave it an energetic run but only for about 8 miles and the EML light came back on the next day.
Question is if I take it on a long run now will it run the regen or will I need the code cleared before I do that?

 

[Smart320]

8 miles not enough miles to get it to regenerate, guess you would need at least 30 miles at 50 + mph to do a complete regeneration, no doubt there are others with more experience of DPF regeneration, but I know I never had any problems with my ML350 cdi but it got regular motorway runs of at least 40 miles

 

[DieselCovert]

From my experience you will have to have the EML cleared before the regen takes place. Then take it for a long run as Smart320 says.

Also worth noting that I had similar issues. For a separate fault I had to have the latest software loaded into the ECU by merc. I believe it changed the way the regen took place. Little and often and it regens when idling. Our car is used 80% on short journeys around town and since the software update we've had no issues. I'll also add we did change the sensor and clean the filter but I think the software update did the trick as once that was done the fault didn't come back.

 

[markjay]

My Kia manual said the car should be driven for 20 minutes at 2,500 rpm or higher to regen.

Not sure what the MB manual says, but the Kia recommendations should give you an idea as to what's needed.

Also, the iCarsoft MB v2.0 can initiate a regen (or some models).

 

[CowleyStJames]

My EML light came on with star diagnosing DPF fault.
Turned out the DPF sensor was at fault.
Once this was changed, £25 part, manual regen initiated, the car has been perfect since.
Don't always presume it's the actual DPF that's causing the fault

 

[DieselCovert]

Turned out the DPF sensor was at fault.

I'd agree with you there. Ours was actually full and despite lots of resets it never regened so I cleaned it out.

My Kia manual said the car should be driven for 20 minutes at 2,500 rpm or higher to regen.

Not necessarily. Our car regens at idle. Crucial thing I think is the temperature. I know it regens as the car runs hot, smells from the exhaust, and the exhaust pipe is hot.

 

[400ixl]

Modern diesels regen at whatever speed once the right conditions are met. 20 minutes plus is advisable to give it time to meet the conditions and complete the regen.

As above it is most often a failed sensor stopping it happening. Only if this has been happening for a while will the dog be full and cause an issue.

Hi revs actually make the problem worse as they are producing more particulates and filling the dog quicker.

Get the root cause fixed, the codes cleared as the first step. Star can also read the soot and ash levels which will give a view of how full it is

 

[garycat]

My Kia manual said the car should be driven for 20 minutes at 2,500 rpm or higher to regen.

I can't imagine a situation where I'd ever drive at over 2,500 for 20 minutes. Even at 80mph my revs are about 2K.

The EML light came on in our E350 CDI - had the code read and it’s DPF. We’ve not been far in the car recently so we know why it’s got to this point - job change has meant hardly any long runs.
Anyway our mechanic reset the code and told me to go for a long run. I gave it an energetic run but only for about 8 miles and the EML light came back on the next day.
Question is if I take it on a long run now will it run the regen or will I need the code cleared before I do that?

Try using a DPF cleaner. My local DPF specialist (Avon Tuning) recommended Forte https://www.amazon.co.uk/Forte-DPF-Cleaner-Regenerator-400ml/dp/B0061ATRK2/ref=sr_1_1?crid=4BTS0K9V51FT

 

[richard]

I have read stories of DPF cleaners destroying the DPF, so please be careful !

R

 

[steveq]

My Kia manual said the car should be driven for 20 minutes at 2,500 rpm or higher to regen.

Not sure what the MB manual says, but the Kia recommendations should give you an idea as to what's needed.

My MB manuals have nothing about DPF regens.

Having had 2 MBs with DPF for a combined period of over 6 years, I have never had a DPF issue.
One of the cars is used for commutes of under 10 miles in traffic and very occasional longer runs with no issues. I did once notice when I stopped that there was a slight burning small and the tailpipe was hot, which I believe was the DPF regen occurring. I did nothing and I assume it finished its regen during the next run.

On my iCarsoft i980 OBD reader, I have seen the DPF fill levels up at 100% or even more and when I next look they are back down at 0%.

As someone said earlier, it would be difficult in normal driving to run the car at > 2,500 rpm for 20 mins.

In my experience it is completely unnecessary to do anything out of the ordinary and just let the car decide when to do the DPF regen.

 

[Bellow]

Hi revs actually make the problem worse as they are producing more particulates and filling the dog quicker.

Been wondering about the constant refrain of 'revs' myself.
I'd have thought 'load' was more relevant.

 

[BTB 500]

Having had 2 MBs with DPF for a combined period of over 6 years, I have never had a DPF issue.

12 years with a DPF-equipped MB here and the only issues have been failed sensors - pressure sensor first, then one of the two temp. sensors. The latter was seized and had to be drilled out

 

[lordlee]

Well I had the codes cleared and did a long run down to the coast at the weekend and the light came back on so there’s possibly a sensor fault. I’ll get it plugged into STAR this week to get a clearer picture.

 

[BTB 500]

Mine went into limp mode with both DPF sensor faults, but yes you need to get it checked on STAR to know what's really going on.

 

[lordlee]

This is what’s come up Lower limit value of component b28/8 DPF was dropped below slash not reached. So Does that mean DPF blocked?

 

[LALIT]

On my 2012 ML250 W166, I had Refill Ad Blue alert,
When I filled tank with 20 litre Adblue then the " No Engine start XXX miles" Warning came up.
EML light is on.
On the service menu it says AdBlue tank is full.

I was advised that the software update will clear the problem.
I can see lots information on Vehicle Data menu of my car but don't know what it means.

How can I check what is the current software version on my car and whether it is the latest one or not?​

The Diagnosis with icarsoft MB V2.0 shows,
P13E7FD 1/3
State: Historic
The AdBlue(R) fill level is low. _
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
P13DF09 2/3
State: Historic
The AdBlue(R) system has a malfunction. There is a component fault.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
P13E400 3/3
State: Current
The remaining driving distance is limited due to a malfunction in the AdBlue(R) system.

 

[lordlee]

It ended up being the DPF sensor and it was £60 from MB so all fitted and working nicely again.

 

[Bhavesh]

It ended up being the DPF sensor and it was £60 from MB so all fitted and working nicely again.

Hey,
Which sensor was it the b28/8 only? Did you have to change the rubber pipes too?

 

[Jockcl500]

The EML light came on in our E350 CDI - had the code read and it’s DPF. We’ve not been far in the car recently so we know why it’s got to this point - job change has meant hardly any long runs.
Anyway our mechanic reset the code and told me to go for a long run. I gave it an energetic run but only for about 8 miles and the EML light came back on the next day.
Question is if I take it on a long run now will it run the regen or will I need the code cleared before I do that?

I have had the same problems regularly when I had a diesel cars, short distance was the issue, getting the engine exhaust hot and then staying in lower gears to run a steady 2500-3000 revs for at least 15minutes always sorted it, but I got sick of it and went back to petrol cars(no dpf issues now), there is no point in having a diesel if you don't do long runs.

 

[lordlee]

Hey,
Which sensor was it the b28/8 only? Did you have to change the rubber pipes too?

Cleaned out the rubber pipes with an air line and yes it was the B28/8 only.