2009 Octavia VRS, CEGA engine code, 295k km. Sooty tailpipe, bad smell, DPF on, stage 1 remap for the last 30k km. The smell is before the remap. Should i delete it? Should i keep it? How i should delete it with minimal noxes and smell and minimal soot levels?

At that many km, odds are the DPF is at the end of its life.  Oil ash accumulates over a long time and cannot be burnt off.

 

I guess depending on local laws if you delete or replace/clean.

I use an app called VAG DPF  which is available for Android and Apple phones and works with Bluetooth  ELM327 diagnostic port adaptors.

 

It will show you the weight of oil ash in the dpf. The weight number in grams approximates to percentage full of ash in the dpf.

 

It does a lot more, including showing how close you are to the next regeneration (soot mass).

 

If you think your dpf is near end of life, an app such as this (and there are others) will confirm if it is true.

 

I also tried VAG DPF but it didn't work for me, but instead i use VCDS and i have some parameters here

@CostinVictor25 To my eyes, it looks like the DPF is full, but VCDS won't tell you the maximum values, it varies from technology used/models.  The only definitive answer is to use ODIS diagnostic platform on you car (dealer or independant garage only)

 

Your pressure difference measured by sensor seems low, either pipe has blown off, or the actual DPF has collapsed in some manner.  The fact you see soot on tailpipe, and it's barely measuring any pressure differential could add value to argument.

 

 

I am not sure of Romania and it's law on car emissions, but you have to make choice to clean/replace/remove.

Cleaning might not give you much more life from it.

Removal will increase the soot released to atmosphere, and affect other emissions.

Replace will be expensive, unless you can source a lower mileage from scrap yard (hoping the mileage values are not lies)

Actually, i would like to remove the DPF or replace it with a downpipe, as i'm also seeking an 2260 turbo upgrade, but i dont't want any noxes in the cabin or any strange smoke apart from the specific diesel smoke. As far as i know, if the software is done correctly, the CR hardly smokes even without DPF and EGR. If i delete the DPF, i should delete the EGR also? I'm trying to figure out a solution as soon as possible.