Dieselgate: How the emissions “fix” will affect your DPF Diesel Particulate Filter in your VW, Audi, Skoda & Seat

DPF dieselgate emissions fix

The public outcry over failed EGR valves post the VW emissions fix continues to dominate our web traffic. We’re hearing from an increasing number of concerned owners who are raising questions over the lifespan of other mechanical components, namely their DPF (Diesel Participate filters).

We’ve covered this problematic and costly filter at length, so lets see how you’ll be affected post the emissions “fix”.

What is a DPF – Diesel Particulate Filter?

A diesel particulate filter (DPF) is a device which sits in the exhaust system, it “captures” soot / diesel particulate and other nasty particles before they are released into atmosphere. A diesel particulate filter can remove upwards of 85% of the particles from the exhaust, reducing harmful emissions. The filter captures the soot and ash particles in a net or mesh like structure within the filter.

All VAG vehicles “recalled” for the EA 189 NOx emissions issue are Euro 5 and by law have to be equipped with a DPF filter.

How will the emissions fix affect my DPF?

In a letter from the UK’s DfT (Department for Transport) Duncan Kay (Head of Vehicle Environment Team) it was confirmed in writing that the “fix” offered to VAG owners “causes about twice” the level of carcinogenic diesel particulate matter to be produced during the combustion process. 

This confirms what many owners have experienced, noting that their engines fans are staying on after the car has been parked with increased frequency. These fans are running due to the vehicle performing a DPF regeneration, attempting to “burn off” the extra soot within the filter. This process would usually happen during normal driving conditions without the knowledge of the driver, however with the increases soot loading it’s proving to be much more noticeable with the regeneration failing to complete before the vehicle has stopped. 

Whats not often mentioned is the Ash buildup which will ultimately be the death of your DPF. Unlike the soot particulates which are burnt off during a regeneration, Ash will build up within the filter until it blocks completely. A DPF regeneration is not capable of burning off the Ash buildup in the DPF, literally meaning a DPF regeneration will NEVER completely clear the filter of all exhaust matter.

The negative effect of emissions “fix” on the DPF filter should see its lifespan cut in half.

With twice the amount of diesel particulate matter being produced after the emissions fix, its expected that this will directly impact the lifespan of the filter by the same amount. It’s widely accepted that a DPF should last about 70,000 to 85,000 files (before the fix). The negative effect of emissions “fix” on the DPF filter should see its lifespan cut in half.

A side effect of increased DPF regeneration is higher fuel consumption. The regeneration works by increasing the temperature of the DPF to a level which allows the soot to be burnt off. This process uses fuel to super heat the filter (to around 600°c).

With DPF filters costing upwards of £600 (without fitting) this represents a ticking time bomb for many VAG owners. 

Should I have my DPF removed?

VW does not make any  physical changes to the DPF during the emissions fix. However if you’re one of the many owners who have opted for a “DPF Delete” VW will not be able to perform the emissions update and will charge you for a replacement DPF. This is often a four figure bill.

We’ve been very clear about our position on DPF deletes / removal from the very start. DPF removal represents an MOT failure and could invalid your insurance. It’s also an offence to alter the emissions system of a vehicle, something not mentioned by the many garages offering this illegal service. We’re not even going to explain the extent of environmental impact. 

Put Simply… DON’T DO IT.

Read more about DPF and your MOT in the read more section below.

Our Top DPF Tips on prolonging the life of your DPF filter

  1. Drive Faster! 
    Contrary to popular belief, driving faster could actually save you money in the long run. A DPF regeneration can only occur when certain conditions are met such as speed, RPM and engine temperature. Unless all these conditions are met, the DPF regeneration process will not start. Driving slow and trying to save fuel might prevent a DPF regeneration.
  2. Do your homework
    Your vehicles owners manual should have the steps / conditions required to perform a DPF regeneration. Before you attempt a DPF make sure you are doing it correctly, unless you’re at the right speed, engine temperature and RPM a regeneration will not begin. Don’t waste your time and fuel by doing it incorrectly. If in doubt, contact your dealership.
  3. Use the right oil
    It’s vital that you only use low SAPs oil in any DPF equipped vehicle. Low saps oil contains lower levels of ASH, the substance which causes DPF filters to clog up. Consult your owners manual if you’re unsure on which oil to use. We’d always advise on using the manufacturers recommended oil. In VW vehicles this is VW 507.00 Engine Oil.
  4. Check our our DPF top tips page
    These tips are just a small selection of our DPF tips. Check out the DPF page links at the bottom of the page for our complete list of DPF top tips.

What happens if my DPF light comes on?

If your DPF light comes on (like this <—- ) we suggest you first consult your manual to see what conditions are required for a DPF burn (If in doubt contact your dealership). You may also want to resort to using one of the many DPF cleaning additives. These cost effective additives assist a DPF regeneration by lowering the temperature required to burn off the soot within the filter. Steer clear of your dealership or Halfrauds, their prices are often astronomical. We’ve always opted for products from Amazon. We’ve put some links below of a selection of the most popular products.

DPF Cleaners At Amazon

Help! The DPF light is still on!

If your DPF light and / or engine management / warning light on after a regeneration cycle it’s likely that the filter is blocked with Ash or the regeneration was unsuccessful (Ash can not be burnt off during a DPF burn). We’d suggest taking the vehicle in to your dealership for a quote on a “forced” regeneration. This will force a full cycle DPF burn without interruption. It might also be a complete waste of money if its clogged with Ash. We apologise for the lack of clarity but once you’re down the road of forced regeneration you’ll be looking at some hefty bills no matter what. 

We’ve been there, done that and got the t-shirt. It’s what ultimately led to the sale of my problematic Nissan Qashqai.

What about owners over the US?

Owners over in the US have nothing to worry about. VW are not only offering up to 11 year warranty on EGR and DPF systems of their fixed vehicles. They are replacing them free of charge in the second phase of their “recall”. 

We note that here in the UK, DPF filters ARE NOT covered under warranty for any vehicle – they are considered a wear and tear item. UK owners are also offered no warranty at following the emissions fix. You can read more about that in our article linked at the bottom of the page.

Lets here from you!

We’ve been overwhelmed by the the response and feedback from our many visitors. We’d like to hear from you if you’ve noticed any increases in DPF regeneration or experienced DPF failure after the emissions fix. Please leave a comment below. We do our best to reply to all comments 🙂

Read more!

If you’ve found this article helpful you might also like to read our other dieselgate – VW emissions fix articles

DPF Articles


Related posts:


Karl is the editor and owner of this glorious website. He currently writes for numerous environmental websites, producing content for the greater good.His experience in graphic design, Wordpress and all things automotive have helped sculpt Hypermiler.co.uk into its current form from very humble beginnings.He has numerous IT qualifications, a red belt in Taekwondo and likes craft Ales.Get in touch via our Contact Page

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16 comments on “Dieselgate: How the emissions “fix” will affect your DPF Diesel Particulate Filter in your VW, Audi, Skoda & Seat
  1. Martyn Maynard says:

    Excellent explanation of this very real issue. Thanks and well done.

  2. Liz says:

    Thanks for the article Karl. Had my update 2 weeks ago, the fan was permenantly on after the “fix” then DPF light now EML. Taking it into Audi today, wish me luck…

    • Karl says:

      Hi Liz

      You’d be quite right in thinking it is related to a DPF regeneration. The EML light would then suggest that this process was unsuccessful.

      Hope they manage to sort it for you, let us know how you get on.



  3. Mark Hyde says:

    Great article as always, just one more reason why I have decided not to have the update! My Tiguan (2015) is booked in for its 2 year service next week and I have categorically told them not to carry out the software update. My local VW dealer, Whiterose, Crosshills near Skipton have always been fantastic and I believe I can trust them.

    • Karl says:

      Hi Mark

      Thanks for the kind words, I hope you found the article useful.

      You are in a group group of people who have opted out of the recall program. I can see it being a selling point in the not to distant future. Did they pressure you to have it done at all? We’ve heard reports of dealerships saying the vehicle may fail future MOTs without it being applied.

      I was in the same position a few weeks back, my 2015 Skoda Octavia VRS TDI was in at Wings Skoda / Peterborough. I was very clear in my request not have the update and made them note it on the job sheet. They confined that the fix would ONLY be done with the owners explicit consent. It’s just a shame the same couldn’t be said for all dealerships.

  4. Liss says:

    The morning after I had the ‘fix’ on my 2013 Seat Ibiza 1.6tdi the DPF light came on for the first time ever! I now really regret having it done.

  5. Justine Cooper says:

    We have had a number of issues with out VW Passat since our lovely car went in for the emissions fix. The engine management light has came within a day of the fix being completed, diagnostics showed it to be the Diesle Particulate Filter, the car shudders when it is stationary, and the smell of diesel inside and outside of the car is immense. The car went in today to look at and sort these problems, have just had a phone call from the VW garage to be told that the problems were there before the car went in for the fix, which is totally untrue as we carried out a diagnostics on the vehicle before it went in just to be cautious. When I argued and explained we knew this was untrue he then had the nerve to tell us that we may be expected to pay for any problems that needed fixing, but would clarify this once he had heard from VW. Be warned, they will tell you that you are the first person to come in with issues after the fix, UNTRUE, they will tell you the problem/problems where there before the fix was done, UNTRUE.
    My advise, do a diagnostics on your vehicle before it goes in and take the proof with you. I am angry that they treat loyal and life long VW customers in this way. Think that we are stupid and trying to claw back money from us that they have had to pay in litigation. DISGUSTING VW.

  6. Stefan says:

    Thanks for posting this, had no problems with my vw for 3 years, it had the fix last month and when I saw the DPF light yesterday I suspected this, they should have put a warranty on the DPF if they knew this would happen, I hope a long drive will fix mine

    • Karl says:

      Hi Stefan

      Unfortunately VW do not offer warranty on the DPF systems – unlike their actions in America which offer a comprehensive 5 year warranty on the EGR and DPF filter.

      Check your manual to make sure you have the correct conditions for a DPF regen.

      Let us know how you get on.

      Cheers Karl

  7. Wayne dobson says:

    Had the fix done 3000 miles ago dpf light had come on twice since then but has cleared itself shortly after , just waiting for it to fail completely now from what I have read form other owners this won’t be too long , have not contacted Audi yet !!!

  8. Jon says:

    It’s confusing that ads for companies that remove DPF are appearing within your article. You should be able to tweak the ad settings

    • Karl says:

      Hi Jon

      Sorry about that. The ads google uses are based on your search and browsing history together with the page content. I do try and remove conflicting advertiser but it’s a constant struggle.

  9. Mads says:

    I had my service action in Feb on my Audi A3 1.6tdi since then the rev counter has been above the normal idle at 1000rpm, and the fan staying on after a journey. The DPF light came on soon after. I can clear the DPF with a shot on the motorway but it only takes a week for it to begin getting back to the idle rate being higher and the fan staying on again. I called Audi garage in March who said they would ask for £240 for a 2hr diagnostics first to investigate since they state it is not related which put me off but now I’ve come to a point where I need it putting right by Audi and have realised from your internet site I’m not the only one suffering from this mess.

    I’ve arranged for a diagnostics for £120 but if the fault is found within the hour then its £60. However if the fault is related to the service action then they wont charge, lets see what they say…I suspect the answer will be, fault is unrelated and leave me further out of pocket.

  10. Keith Wilson says:

    I’m not getting the fix. Ive got 11 plate passat cc. My local independant also advised against getting it done for the same reasons stated in your article. They didnt think it would adversely affect resale value either

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