Now I do only short journeys  the regeneration comes on after every trip, should I be concerned. The car is always serviced on time from new and nothing has been said of any fault.

It will keep trying to regen on every journey until it is able to complete.

 

Probably best to take it on a longer trip to let it complete a regen so the fans don't run when you turn off the engine.

 

Every attempted regen adds a little diesel to the engine oil which can cause other serious problems.

Best check the oil level isn't too high .

What is regeneration?

47 minutes ago, Aj77 said:

What is regeneration?

Diesel Particulate Filter (DPF) regeneration, where the fuel system injects fuel into the exhaust system to raise the temperature and clean out the filter.

Thanks guys

repeated short journeys in cars with DPf's are not advised, this blocks / fills the filter quicker and if it's not able to complete a regen often this will soon show up with codes and you'll be looking at chem clean or replacement (removing your DPf is a MOT failure).

 

If you car has not had the Skoda 'fix' typically regens are at around 350-400 miles maybe make a note of this and take the car for a blast around this figure - get the car up to temp then sit for about 3 miles over 2.5K revs this should allow it complete the cycle 

8 hours ago, Gissin said:

repeated short journeys in cars with DPf's are not advised, this blocks / fills the filter quicker and if it's not able to complete a regen often this will soon show up with codes and you'll be looking at chem clean or replacement (removing your DPf is a MOT failure).

 

If you car has not had the Skoda 'fix' typically regens are at around 350-400 miles maybe make a note of this and take the car for a blast around this figure - get the car up to temp then sit for about 3 miles over 2.5K revs this should allow it complete the cycle 

Thanks for comments, it has had the "fix"   so will have to do what you said.

Does the emissions "fix" actually change the regeneration parameters or is it that the increased EGR creates more soot resulting in more frequent regens?

 

In VCDS I can see the parameters and a regen is triggered when the soot level reaches a certain threshold, 25g I think, I dont know whether it uses the measured or calculated soot loading as mine are always different with the measured being lower than the calculated.

 

The measured I believe is from the data output of the DPF differential pressure sensor.

 

Not having a smartphone I cannot use the app but during the lockdown & the shorter journeys I never saw in VCDS a distance since last regen of more than 200 miles & when I have been aware of regens they have been 200 miles apart, even when I did 500km autoroute journeys it did not seem to reduce the frequency.

 

I have an EGR emulator/simulator (currently disconnected to evaluate remap) so there is no EGR but the ECU thinks its happening, if the regens are triggered by the calculated value then I must look at getting the fox rolled back, I had the option during the remap but decided to stick with the emulator, I had not considered that the regen frequency may be increased come what may, I dont like the idea of all that wasted fuel, the heat created etc to burn off soot that may not even be there!

 

 

update includes a revised fuel injection pattern, meaning that the number of injections, as well as the timing of those injections are changed, which results in an improved burning process in the engine. The software update also increases the affected vehicles’ Exhaust Gas Recirculation (EGR) rate, which results in lower nitrogen oxides (NOx) production. increased EGR rate would go along the lines of more soot build up and therefore increased regens

 

Whilst i'm not 100% on Dpf regen I believe this can be either triggered by the soot level building up to a predetermined level or reaching X miles since the last active regen

 

I say typically as most people won’t be checking on VCDS/ VAG DPF but pre-fix most people report 300-500 miles, post fix around the 200 mark this will obviously also vary with driving style, mine for instance is like clockwork at 400ish miles this is pre and post map too

 

for the Op could also be a pressure sensor starting to not read correctly.  having a look at the Dpf in software could help diagnose issues

As we cannot go far these days wonder if by going into sport mode will help, being as it it is higher revs / Any thought guys.

I did a run with VCDS connected today, I was interested in the exhaust temperature but had the DPF figures running anyway, it has only done 16km since the last regen (I realised it was happening and did a quick motorway run) the calculated soot value was already 6.5g and given that the 16km were at motorway speed its not looking good at all.

 

For the first time ever the measured soot value was closer to the estimated (5 point something grammes) it appears that you need to be driving to have any faith in the measured DPF values, at standstill or tickover mine are usually negative.

 

Does anyone know whether the regens are triggered from the measured or calculated soot readings? Or perhaps whichever exceeds the threshold first?