I have a 2016 Skoda superb 130k Kms and over the last few weeks I am having regens every 60km. Recently I'm doing lots of shorter trips and very little motorway, but trying to let the reg cycle complete when I notice it's running. Am I looking at an issue with my dpf and is there anything I can do to prolong it's life?

Edited 2 August, 20241 yr by irishguy

The ash is the one to look for. Once it gets up the dpf needs to regen more often

What are you doing to let it complete?

 

6 minutes ago, MarkyG82 said:

What are you doing to let it complete?

Just driving a bit longer or in some cases letting it idle and Keeping an eye on vag dpf.

33 minutes ago, Blue8793841 said:

The ash is the one to look for. Once it gets up the dpf needs to regen more often

I was thinking 39% wouldnt be an issue.

 

I'm wondering would a few hours motorway driving and/or some dpf cleaning fuel additive help?

You can't clean the ash. You need to replace or professionally clean. 

Have you checked the pressure sensor isn't getting blocked? 0 pressure could indicate a hole in the hose, duff sensor maybe 

On 02/08/2024 at 22:41, irishguy said:

I'm wondering would a few hours motorway driving and/or some dpf cleaning fuel additive help?

 

I had a month with my car which was similar. 

My wife was using it and only doing short journeys & it seemed like there was a constant attempt to regen.

At the end of the month I had the warning "DPF see manual".

 

I took the car on a run up the motorway and after 10 minutes the warning has cleared. 

We've not had any issues since...

 

The car is currently at 225k km & I've never used additive or cleaner.

On 05/08/2024 at 09:24, Gabbo said:

 

I had a month with my car which was similar. 

My wife was using it and only doing short journeys & it seemed like there was a constant attempt to regen.

At the end of the month I had the warning "DPF see manual".

 

I took the car on a run up the motorway and after 10 minutes the warning has cleared. 

We've not had any issues since...

 

The car is currently at 225k km & I've never used additive or cleaner.

Iv do a few 20-30km motorway trips, but it was after a regen. I'm going to take it on a 400km spin at the weekend and I picked up some ecomotive drive clean so I'll see how that goes. Regens are taking 45mins which is a bit of a pain.

 

Some screenshots from this mornings one

On 02/08/2024 at 23:05, Blue8793841 said:

The ash is the one to look for. Once it gets up the dpf needs to regen more often

 

Agreed however the figures for both soot and oil ash are fantasy, created by an algorithm and can be reset to zero using VCDS without even touching the DPF let alone cleaning or replacing it.

 

Differential pressure is an actual measured reading and the zero reading of the Op's is implausible

On 02/08/2024 at 22:41, irishguy said:

 

Just driving a bit longer or in some cases letting it idle and Keeping an eye on vag dpf.

 

Does this genuinely complete the regen or are the fans running after shutoff?

37 minutes ago, MarkyG82 said:

 

Does this genuinely complete the regen or are the fans running after shutoff?

Yes it does. I can see it in vagdpf, fans turn off and stop start re enables. 

Another update I did a 400km trip and it just re gened once at the start and then the day after on a short trip.

 

There seems to be a pattern when doing a few short trips that vagdpf reports that its @c.50% full and then it just jumps up to 100% and regens. I'm wondering if that might be a sensor? 

 

Also I feel that with a similar amount of driving as before it's reporting higher amounts of soot.  Any suggestions would be appreciated 

 

 

That looks like it's a soot increase over 3km?

That can't be right, definitely something wrong somewhere. The DPF might be doing its job, but not burning fuel well.

Soot is normally modelled based on how the engine operates & corrected by the Delta Pressure Sensor...

 

As previously mentioned I'd start with the DeltaP sensor.

Maybe also checks the EGR valve is able to close correctly ???

 

In the long run it may well be worth to pay a dealer to run a diagnostic of the aftertreatmemt system to help pinpoint the cause.

42 minutes ago, Gabbo said:

Soot is normally modelled based on how the engine operates & corrected by the Delta Pressure Sensor...

 

As previously mentioned I'd start with the DeltaP sensor.

Maybe also checks the EGR valve is able to close correctly ???

 

In the long run it may well be worth to pay a dealer to run a diagnostic of the aftertreatmemt system to help pinpoint the cause.

Thanks i think I'll have to I was just trying to prepare myself 😊

 

1 hour ago, defsix said:

That looks like it's a soot increase over 3km?

That can't be right, definitely something wrong somewhere. The DPF might be doing its job, but not burning fuel well.

Ya it's over 3km, I see that a bit it just jumps up all of a sudden, which it never did before.

 

So I was guessing it might be a sensor

Maybe, but the Soot measurement is only calculation not a direct reading, I believe.

1 hour ago, defsix said:

Maybe, but the Soot measurement is only calculation not a direct reading, I believe.

Yes but the sensor is used as a comparison with the calculation to adjust the calculation to the "real" soot load...

Is assume, If the DeltaP sensor suddenly jumps to a much higher but plausible value, the system will think the DPF is full & trigger a regeneration regardless of the calculation or time since the last regen...

16 minutes ago, Gabbo said:

Yes but the sensor is used as a comparison with the calculation to adjust the calculation to the "real" soot load...

Is assume, If the DeltaP sensor suddenly jumps to a much higher but plausible value, the system will think the DPF is full & trigger a regeneration regardless of the calculation or time since the last regen...

I would assume a delta p sensor would either work or not work. This seems to be consistently regening at the same distance c65kms or could the sensor give a miss reading which is forcing the Regen at a lower pressure?

Who knows what the car has had done to it in the past? Adaptions could have been deleted and reset or maybe not, I recommend using genuine or dealer level software and comparing it to your app that you are using.

On 16/08/2024 at 17:50, irishguy said:

I would assume a delta p sensor would either work or not work. This seems to be consistently regening at the same distance c65kms or could the sensor give a miss reading which is forcing the Regen at a lower pressure?

 

Sensors can fail & give in range values although it's less common than an electrical faulty like short to battery or open circuit. 

 

The DeltaP sensor is connected by pipes to the entry and exit of the DPF to measure how the air is flowing through it. 

This pressure will vary at different engine speed, injection quantity & DPF soot level.

 

If there was a blockage in one of the pipes it could allow the pressure to increase but not decay as quickly as expected. 

This could then be interpreted by the ECU as a "full filter" because the pressure is higher than expected. 

 

Gabbo

 

Just want to say letting the car idle to finish the regen is IMO a bad idea and unecessary. It's a waste of fuel and I think it is likely to cause more oil dilution and wear to the cylinders than it otherwise would by just letting it carry on regenerating the next time you drive it.

8 hours ago, SuperbTWM said:

Just want to say letting the car idle to finish the regen is IMO a bad idea and unecessary. It's a waste of fuel and I think it is likely to cause more oil dilution and wear to the cylinders than it otherwise would by just letting it carry on regenerating the next time you drive it.

I would do it if I knew I would be doing a few short trips together. I was thinking it was better than getting it up to temp multiple times causing more soot/ash etc

What app and equipment do you need to get this information. I see there are apps. But do you need something to plug into the car? 

Thanks

Adrian. 

Vagdpf is the app and you can get any OBD2 adapter. I got a carista one

Which Carista adapter do you have? 

I bought one for €13 from Amazon a few months ago but don't want to pay for the subscription. 

I was going to sell it but if I could use it as a Bluetooth OBD adapter this would be cool...