Diesel Particulate Filter (DPF) Solution, Cleaning & FAP Service - Quantum Tuning

DPF Cleaning | DPF Regeneration | DPF Replacement | DPF Recalibration

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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?

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LEGAL REQUIREMENTS AND THE MOT TEST

As of February 2014, new UK MOT regulations came into force stipulating that original equipment DPF units must still be in place. It is an offence under the Road Vehicles (Construction and Use) Regulations 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 requirements, 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.

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WHAT IS A DPF?

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

They have been in common use in passenger cars and light commercials from around 2003 in preparation for Euro 4 regs in 2005. Peugeot, Renault, and BMW were early adopters. Euro 5 emissions regulations in 2009 made it compulsory for diesel cars and light commercials to have a DPF fitted, and the 2014 Euro 6 introduced further emissions restrictions.

As with any type of filter, a Diesel Particulate Filter needs to be cleaned regularly to function properly. In this instance the process is known as regeneration, where the soot is burned off – which you may notice as a blast of white smoke emanating from the exhaust – leaving an ash residue within the DPF.

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 BMW 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.

PROBLEMS ENCOUNTERED WITH DPF

If regeneration doesn’t function properly it leads to a build-up of soot affecting performance and fuel economy, left unattended this will result in a Blocked DPF which can ultimately 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, meaning the vehicle will have minimum power barely sufficient to crawl home.

For regeneration to take place it requires the vehicle to be driven regularly 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 for short journeys, rarely getting up to the full operating temperature that a regen needs; and over time a DPF will suffer from an accumulation of ash residue whether it has been correctly regenerating or not. For this reason, a DPF is classed as a serviceable item by vehicle manufacturers, not covered under warranty. DPF systems therefore require proper maintenance.

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 is classified as a Serviceable Item by the vehicle manufacturers like brake pads or air filters etc and not covered under warranty. DPF systems therefore need to be maintained properly.

WHAT ARE MY OPTIONS?

If your DPF warning or Anti-Pollution warning lamp is illuminated, do not ignore it. Get professional advice, consider your options carefully, and attend to the problem. Leaving it will ultimately cost you much more in additional repair bills and it can be dangerous.

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

DPF Regeneration – Quantum dealers can offer a regeneration service

DPF Replacement – Quantum dealers can replace the DPF, normally at a fraction of the main dealer cost.

DPF Cleaning – Many Quantum dealers offer a DPF cleaning service

DPF Recalibration – If you have had your DPF core removed, your Quantum dealer may be able to recalibrate your vehicle’s ECU to stop your engine going into limp-home mode, and to clear the DPF warning light. Consumers must be aware of the legal implications (as above) of this being carried out.

DPF removal is legal in certain countries and when used for off-road or motorsport – if in any doubt please take advice.

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WHAT ELSE SHOULD I BE AWARE OF?

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 Nissan 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. If you have the DPF removed this function as it is no longer required and can be disabled.
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.
Diesel Particulate Filters were designed with good intent to reduce particulate emissions and offer a better environment. In theory a DPF would trap soot in urban areas and then regenerate on the open road, unfortunately this does not always work well leading to expensive repairs.
The fact that DPF units are made with expensive minerals like Platinum, that excess fuel is needed for the regeneration process and that ultimately the accumulated soot and ash has to go somewhere… back into the environment which many now question the overall environmental value of the entire life cycle.

DPF Problems? | DPF Warning Light? | Poor Acceleration & MPG?