What's an average mg/min of soot reading ( shown in vag dpf)? 

Hi Bogdan, think i have a similar issue. Can i ask if your coolant fans were running full blown when the dpf was attempting regen and sometimes stay on after turning ignition off? 

Thanks

Luke

Yes. That's a common behavior.

Just now, BogdanB said:

Yes. That's a common behavior.

Thanks Bodan, When yours was doing it did the dpf light appear on dash at all? Mine seems as if it’s constantly trying to regen but light hasn’t come on. Had a forced regen, replaced the dpf sensor but no luck. 

On 13/03/2021 at 15:43, BogdanB said:

What's an average mg/min of soot reading ( shown in vag dpf)? 

Once it gets to around 50-60 it won't regen. But different cars have different amounts.

29 minutes ago, BogdanB said:

Yes. That's a common behavior.

It’s just mines doing all the same things you’ve mentioned, rpm higher, start stop disabled, fans running but no dpf/engine warning lights. Had it checked by škoda and theirs no readings that would indicate a problem however it’s done 150k miles and all the systems seem as if it’s trying regen?! 

Hey Guys, sorry to bring up an old thread but didn't want to duplicate another one for a very similar issue I am having at the moment. I too have an issue where my car (2014 Octavia Mk3) is performing very frequent regens and my fuel consumption is very high.

 

As far as I can tell the regens are completing fully and the values drop to approx 5g for the measured values and less than 3g for the calculated. I then see the measured value increase very quickly and within about 20km of the previous regen usually another one kicks off. I also see my differential pressure seems very erratic from 20-30 @idle with spikes up to as high as 400Mpa. Could there be an issue with the differential sensor maybe?

 

I also can see that when regen is running the input temp is higher than the output temp which I have seen suggested indicates there is nothing for the DPF to burn off but I'm not sure if this is the case.

 

The car has about 175k miles on it and the oil ash residue is reported as 65.5g which I understand is getting towards the quoted end of life of the DPF but I am not getting any warning lights or no error codes logged in VCDS while this behavior is ongoing. If anyone has any ideas I would love to hear them or what I should be asking the mechanic to check or do.

I have downloaded this data from the DPF app so i can add some more screenshots or data if there is something particular anyone would like to see. I have attached some plots of the behavior I have outlined above sorry i dont know how to add them into the correct part of the posts yet.

Any questions please ask away,

Thanks a lot

 

Hi, I kept going around in circles with mine and couldn’t get a guaranteed diagnoses or fix from multiple mechanics including Skoda so in the end i bit the bullet and got the DPF and EGR deleted with a reputable company and the problem was solved. Car drives so much better now and is substantially better of fuel. Hope this helps, Luke. 

Does the reputable company advertise that they remove DPF,s? 

 

A nod is as good as a wink to a blind man.

 

The DVSA ^& DfT are not taking it too seriously.  

 

Edited 20 February, 20251 yr by Ootohere

An MOT tester passing a vehicle which has the DPF removed is not harming the environment, he may be aiding and abetting the owner to do so but that probably is not an offence, as for fraud the DVSA blogger should check his beliefs before making such a statement.

 

dishonestly making a false representation (to a person, or to any system or device) with a view to gain or with intent to cause loss or expose to a risk of loss

Not a DVSA Blogger.   Government website 

 

 

Edited 20 February, 20251 yr by Ootohere

DVSA are responsable for MOT testing, its a government department.

 

I called the author a blogger because of the web address:

 

Mattersoftesting.blog.gov.uk

@J.R. We never all came up the Clyde in a rowing boat, some of us have been here as long as you and are still here on the northern side of the Channel. 

At the moment here in Ireland as far as I know the DPF is not part of the NCT (our MOT check) but I am reluctant to start by removing it when I plan on keeping the car  as there is mention of them being added to the checks who knows when or if it will happen. 

I am wondering if as a start point it might be worth replacing the differential sensor. I previously had the sensor changed when the mechanic noticed the inlet on the old sensor had broken off about 6 months ago while working on another job. Since this was done there has been no change to the behaviour noted in the earlier graphs (similar/same pressure readings) my only doubt as to why it might be worth trying again is that the mechanic didnt adapt the sensor when it was changed so I am wondering 2 things.

1. Would it be worth trying to adapt the sensor now or is this a 1 time thing that is to be done before the car is started after changing or it is too late?
2. Would I try replacing the sensor again and making sure it is adapted 1st this time or is that just a waste of time

 

14 hours ago, Ootohere said:

@J.R. We never all came up the Clyde in a rowing boat, some of us have been here as long as you and are still here on the northern side of the Channel. 

 

You will have to explain that for me as I have no idea what you are talking about.

Does anyone know if DPF differential sensor can be adapted some time after it has been changed or is this something that can only be done when the sensor is changed initially before the car is run?

It can be done.

On 24/02/2025 at 11:56, J.R. said:

It can be done.

 

Thanks J.R.

I've got the loan of a VCDS this morning and found a procedure online where step 1 was to adapt the sensor although  and 2nd step to reset the learned values on the ECU. My vehicle doesn't seem to have the option for step 2, so I have just adapted the sensor and will see over the next few days if there is any difference. 

If anyone knows of another procedure or step I might have missed thanks in advance

Are you using quality fuel? I've seen people using Archoil 6400-D and going from 200 mile regens to 800 miles between regens.