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Suzuki Diesel particulate filters (Suzuki DPF) ) are devices that truly capture diesel particulates to prevent their release to the atmosphere. Diesel particulate filter materials have been settled that show impressive filtration efficiencies, in additional of 90%, as well as good powered and thermal toughness. Diesel particulate filters have become the most effective technology for the control of diesel particulate emissions—with particle mass and numbers with high capabilities.

Owing to the particle deposition mechanisms in these devices, filters are most operative in regulatory the solid portion of diesel particulates, including elemental carbon (soot) and the linked black smoke release. Filters may have limited effectiveness, or be totally ineffective, in controlling non-solid fractions of PM emissions SOF and sulfate particulates. To control total PM emissions, DPF systems are likely to include additional useful components directing the SOF typically oxidation catalysts while ultra low sulfur fuels may be essential to control sulfate particulates.

The term “diesel particulate trap” is from time to time used as a synonym for “diesel particulate filter”, particularly in older literature. The term “trap” covers a wider class of particle departure devices. Several particle deposition mechanisms other than filtration are commonly employed in industrial dust separation equipment. Examples include gravity settling, centrifugal separation, or electrostatic trapping. None of these methods could be adopted to control diesel PM emissions, due to the small particle size and low thickness of diesel soot.

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  • Are you having problems with your DPF?
  • DPF or Anti-Pollution warning lights on your dash?
  • Car in “limp home” safety mode?
  • Poor acceleration and MPG?
  • Facing expensive repair costs to replace the DPF?
  • Confused what the best solution is for you?
what is dpf
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From February 2014 the inspection of the exhaust system carried out during the MOT test will include a check for the presence of a DPF.

A missing DPF, where one was fitted when the vehicle was built, will result in MOT failure. A vehicle might still pass the MOT visible smoke emissions test, which is mainly intended to classify vehicles that are in a very poor state of repair, whilst emitting illegal and harmful levels of well exhaust particulate. It is an offence under the Road vehicles (Construction and Use) Regulations (Regulation 61a(3))1 to use a vehicle which has been modified in such a way that it no longer complies with the air pollutant emissions standards it was designed to meet.

Removal of a DPF will almost invariably contravene these necessities, making the vehicle illegal for road use. The potential penalties for failing to comply are fines of up to £1,000 for a car or £2,500 for a light goods vehicle.


A DPF (Diesel Particulate Filter) also known as FAP on some French vehicles, is a device fitted to the exhaust system of current diesel vehicles to reduce emissions and meet European emission standards. It does this by trapping Soot (Particulate Matter - PM) from the exhaust gasses while letting the gasses flow through the system.

As with any type of filter a Particulate Filter for Suzuki needs to be cleaned regularly to function properly. With DPF’s this is done by a process known as Regeneration which involves a combination of a Catalyst function in the system and burning the soot to gas at a very high temperature leaving behind an Ash residue within the DPF. Renewal should be an automatic process taking place in the normal use of your vehicle, you may have noticed this in the form of a blast of white smoke form the exhaust on occasions.

DPFs have been in common use in passenger cars and light commercials from around 2003 in preparation for Euro 4 regs (2005), with Peugeot, Renault and Suzuki being early takers. Euro 5 (2009) made it compulsory for diesel cars and light commercials to have a DPF fitted and Euro 6 2014 will tighten this up further.


If regeneration doesn’t function properly it leads to a build-up of soot moving performance and fuel economy, left unattended this will result in a Blocked DPF which can eventually cause very expensive damage to other engine components. A blocked DPF is also potentially dangerous as it can cause overheating in the exhaust system and cause a fire risk. To prevent this damage most new vehicles will go into “Limp Home” safety mode at this stage, sense the vehicle will have minimum power barely enough to crawl home.

For regeneration to take place it requires the vehicle to be driven frequently at some speed on open roads e.g. motorway driving, typically driving at around 2500 RPM for approx. 15-30mins at least once a month, this will keep things working.

Many diesel vehicles are used primarily in urban areas or on short stop start journeys e.g. local deliveries, taxi’s, school runs etc. and many have auto gearbox, so the vehicle does not get the chance to heat up sufficiently and is unable to carry out a full regeneration process.

Even if the regeneration functions as it should, over time the Ash Residue will build up in the DPF and have the same affect ultimately resulting in a blocked DPF. For this reason a DPF FOR Suzuki is classified as a Serviceable Item by the vehicle manufacturers like brake pads or air filters etc. and not covered under warranty. DPF systems OF Suzuki therefore need to be maintained properly.

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By the time your DPF warning lights are visible your DPF will already be significantly blocked. Forced regeneration by a garage or a “blast down the motorway” is not likely to cure the problem, these only work as preventative maintenance. So at this stage realistically you have the following options:-

Suzuki DPF Regeneration – We use expert electronic tools to run a Static Renewal process. This is in fact forcing the vehicle to perform the regeneration process which it should have been doing automatically but may have unsuccessful due to the usage of the vehicle or due to component or system failure. We also carry out a diagnostic check to assess the problem. Depending on circumstances this may or may not cure the problem, we will advise you of our opinion in advance.

Suzuki DPF Cleaning / Reconditioning – We use professional chemical treatments to clean your existing DPF and in some conditions we may need to service the DPF unit using approved process returning your DPF to almost its original efficiency. We will carry out diagnostic checks, remove the DPF unit where necessary, clean or recondition the unit and refit it, then reset the ECU and clear the warning lights. This is the most popular and cost effective solution.

The ideal DPF solution for Suzuki - for you depends on your situation e.g. type, condition and practice of your vehicle, how long you mean to keep the vehicle and your budget. Each option has its own merits and you should also bear in mind other suggestions like traffic law, vehicle warranties and insurance etc.


  • It is often said that you should “go for a blast” down the motorway to clear the DPF. Please note this is only partially true. If the DPF is blocked beyond the capacity for regeneration or blocked due to Ash residue, you will do more harm to your engine.
  • There are many DPF cleaning additives available promising a magic cure for DPF. We have yet to find one that will clear a blocked filter and will certainly not clear an Ash blocked filter. Some products can however be useful in keeping a functional DPF in good health.
  • DPF units are closely linked with other emissions components, if these parts do not function properly they can help to block the DPF, similarly a blocked DPF can damage these components due to excess back pressure.
  • DPF units are located close to the Turbo, if the turbo is leaking oil it can help to block the DPF, similarly a blocked DPF can damage the turbo due to excess back pressure.
  • Some PSA engines fitted to Peugeot, Renault, Ford, Volvo and Suzuki have an on board Fuel Additive System connected to the DPF to help regeneration. It is important to maintain this system and keep it topped up with the additive (only available from main dealers approx. £130 per tank) if not it will block the DPF. In our experience this is often neglected, even by main dealers due to the cost.
  • Some vehicles have a dedicated DPF or Emissions or Anti-Pollution warning light which is great, however many will just have an Engine light on. It is important to check by diagnostics why the light is on and not advisable to simply get the light turned off without investigation.
  • DPF work is complex and should only be carried out by experienced professionals with the correct specialist equipment. All work on a DPF has to be completed with the appropriate recalibration or reset on the vehicle ECU. It is not possible to simply delete the DPF electronically or just remove the DPF unit without work on the ECU.
  • It is our experience that many garages including main dealers are not knowledgeable in DPF and related issues. Our dealers often see customers after they have spent a lot of money on the wrong fixes as the DPF fault was not correctly diagnosed.


At present it is not illegal to remove the DPF and it doesn’t form part of the MOT test. Whether this might be tightened up in the future, no one knows and our best guess that even if it is, then it will not be applied retrospectively.

There is a small part of the MOT regulations that say there should not be physical change to the emissions system, however the removal of the DPF will not change the results of the diesel smoke test and at present no other emissions related test is done during the diesel MOT.


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