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The Engine Tuning Performance Specialists

DPF (Diesel Particulate Filter Removal Oxford / Oxfordshire- DPF Delete – DPF Problems

DPF Removals, Replacements, Cleaning & Re-manufacture.

DPFLIGHTLike any filter, your DPF can become blocked by engine produced particulates. The main constituent of these particulates is ‘Soot’! There are several choices:

  • Cleaning the DPF
  • Replacing the DPF
  • Removing the DPF

ANGEL TUNING can offer you any one of the above solutions.


We now offer a brand new service, that carries a 12 month, unlimited mileage, pan-European warranty to remanufacture the DPF, with a ONE DAY TURNAROUND.


DPF Removal From £430.00

Service includes: Removal of DPF, Disabling of the EGR & Remapping of the ECU

What’s a DPF?

The modern diesel vehicles have seemingly vastly improved as they now run without the obligatory ‘black smoke’ which was the signature of the older diesel engines. This has been achieved by the manufacturers adding a Diesel Particulate Filter (DPF) into the exhaust of the modern diesel vehicles, to catch the engine particulates. The particulates are trapped when the car is driven at low speeds in the city centres, and whatever has been collected in the filter would then be blown out and expelled when the car is driven at higher speeds on the outer city roads and motor ways. So the when the modern diesel cars are driven at speed on the motorway, emitting a cloud of smoke, the chances are that its engine is working as it should and that the ECU is performing a ‘regeneration cycle’.

Why do DPFs get blocked up?

There are two most likely causes for a blocked DPF. Firstly and most commonly if you travel relatively short distances in traffic and never take the car on dual carriageways and motorways at higher speeds, the filter will do its job properly, but the ECU (the engine brain) will not get the opportunity to ‘regenerate’ or expel the particulates and eventually the filter becomes totally blocked. This will cause the vehicle to eventually slip into ‘Limp Mode’, and warning lights and messages will advise you to take the car to your nearest manufacturer supported dealer. Secondly the DPF may simply come to the end of its natural life. Even if you have driven plenty of motorway miles and you have been lucky to have experienced a chain of successful regenerations, a DPF will not last forever. Each ‘regeneration’ will leave a very fine layer of ash residue behind, and this will eventually become the cause of the ultimate blockage. Further forced regeneration cycles will not clear this. The units will need replacing sooner or later.

The picture left shows a typical example of a blocked DPF core that we have removed. The core fills the entire canister, causing the engine to work much harder than needed, in order to push the gasses through it. The more blocked it gets, the more back pressure it causes. The net result of the blockage in this instance was poor fuel economy and performance.

The picture right shows the EXIT end of the same DPF. The photo shows clearly that there is a blockage between the core and the exit, affecting the engine efficiency and its fuel consumption.

The picture left is of a cross-section of the same DPF. This particular unit had in fact been working very efficiently, as the white areas shown are ash. This means that the black soot particles had in fact been successfully reduced by many regenerations.

Each time the DPF goes through this cycle the extra fuel that gets pumped in creates such a temperature that it reduces the soot particles to nothing but ash. In the end though, no matter how efficient, you cannot reduce ash any further and the ash itself becomes the reason for the blockage.

This is the picture of the DPF we removed from a car which broke down en-route to our workshops. The DPF has literally been reduced to solid lumps of ash!

Will my car pass its MOT without a DPF?

As of February 2014, the MoT Test Stations will as part of their VISUAL inspection during the test, check to ensure the existence of the DPF. So technically speaking, until such a time that there is a method to detect soot in the exhaust gases, it is almost an impossible task to detect the removal by any other means than the visual checking to see if the exhaust has been cut and welded! So the answer to the above question is no it will not, but only if they can detect it through the visual inspection of the exhaust. We have to recommend that you look at alternatives, such as cleaning or replacement (and we can offer both at very sensible and much more competitive prices than the dealers). However, should you wish us to, we will remove the DPF for you, once you sign an authorisation letter for us to do so.

What about the alternatives?

The alternatives are as mentioned above, cleaning or replacing. Cleaning works on the understanding that prevention is better than cure, so we remove the DPF, clean it through the only approved process, and replace. This will take anything up to 3 days because we need for the exhaust to cool down sufficiently before any work can take place. Replacement is another alternative. The main dealers are enjoying a monopoly on this. Their labour rates are usually the most expensive part of the process of replacement. We can offer you an Original Equipment quality part, at a very reasonable labour rate. Our operatives would be delighted to provide you with a quotation on either alternative, either on live chat or by calling our landline number. We also have Courtesy Cars for your convenience, should you need to remain mobile whilst the work is being carried out, which your insurance company will in majority of cases cover for free.

Can I still insist on removal of the DPF?

Absolutely! All we need is an authorisation form signing and we can provide this service for you.

What is DPF ‘delete’?

Once the DPF has been removed, the engine’s management system (ECU) has to have the regeneration process (inbuilt in its memory) removed from it. The ECU remap will also provide you with the full benefits of the power and Torque increase.