As well as Terraclean, James Price’s Garage also offers a DPF clean suitable for vehicles with a DPF blocked with oil or ash. DPF’s block due to other problems, cleaning is not enough, you need the problem professionally identified and rectified, if not done correctly the unit will simply block again after cleaning. 

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Your search for a DPF Reconditioning specialist ends with James Price's Garage. Visit us today. We are based in Walsall.

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What is a DPF?

A diesel particulate filter (DPF) is a device which sits within a vehicle’s exhaust system and is designed to “capture” soot/diesel particles to reduce harmful emissions into our towns and cities.

It became legal for vehicle manufacturers to fit DPFs to all vehicles when “Euro 5” emissions standards came into force in 2009, although some VMs did fit them prior to 2009.

DPFs are intended to self-clean, through a process called “regeneration”. This happens under certain driving conditions and the particles are emitted, leaving only a small ash residue. Sensors in the DPF unit communicate with the vehicle’s central computer (ECU) to determine when to clean/regenerate the DPF.

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Why do they block?

Firstly, they shouldn't block. A blocked DPF is usually a symptom of another problem with the engine, causing either premature blockage or failing to perform a DPF regeneration.

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DPF Cleaning FAQs

My DPF light has come on what does this mean?


It depends on the Manufacturer of your car, it often means you need to keep driving until the light goes back out, if it does not go out after 20-30 minutes driving on a dual carriageway it is likely that there is a problem with regenerating and if the problem is not addressed the DPF will eventually block.




What Causes DPF problems?


There are many reasons for DPF problems but in most cases its not the Filter that is at fault, in fact more likely to be the victim of another issue which can be just a case of to many short journeys or another fault somewhere else on the car.




What is the purpose of a DPF?


A DPF is a fine filter designed to trap Particulate matter (soot), then when a certain amount has been collected the cars management system puts it into regeneration mode, where it raises the exhaust gas to a target temperature of 550c or 450c for Peugeot engines that are fitted with an additive system, when this temperature has been reached the soot will burn and leave behind a tiny amount of ash, and the DPF is free to collect more soot again.




What will happen if I don't do anything about the the DPF light not going out?


The warning light is there to either notify you to keep driving until a regen is achieved, or to warn you the car is not able to regenerate the filter if you keep on driving like this the filter will continue to fill with soot until exhaust gas will struggle to pass and it will become to dangerous to regenerate itself and will disable regeneration, an overfull DPF burns to hot and can melt the filter this is why the engine prevents it from regenerating when it is too full, it can also cause damage to the turbo if you continue to drive, it will eventually block to the point the engine can no longer run.




My Car has high Mileage will this affect my DPF?


Yes a DPF is a Soot Trap which is made up from Combustible Hydrocarbons but when these are burnt of during regeneration a tiny amount of ash is left behind which is trapped in the filter eventually this builds up to a point there isn't enough room left for soot to accumulate and the filter will try to regenerate more often until the ecu rejects it based on regen frequency, your dealer will inform you that it needs a new one fitting but we have a cleaning solution for this.




What is the difference between ash and soot?


Soot is the particulate matter the DPF is designed to trap and Ash is a mineral and metal deposit that is left behind, ash cannot be dissolved and can't be removed in the same way as soot with any solvent agents, the DPF can be removed and sent to our Head Office, where it can be deep cleaned to remove deeply embedded and compacted ash, this saves on the cost of a new filter and will also save on fuel due to reduced regeneration frequency.




My DPF is blocked to the point the car won't run can you still clean (unblock it)?


Yes there is a very high probability that we can unblock it we can still injection clean them to break down the soot to clear the DPF while still fitted to the vehicle.





Stage One - Diagnostics

We diagnose the condition of the Diesel Particulate Filter & establish if it's blocked. Then we have to establish the cause because cleaning alone usually doesn't resolve the problem, if the cause isn't identified then it is likely to block again very soon.

Stage Two - Cleaning

The cleaning process involves injecting Specialist TerraClean fluid directly into the Diesel Particulate Filter. This process will break down the carbon particles enough to be able to pass through the filter and reduce the exhaust back pressure. The engines management will then allow a regeneration again.

Stage Three - Regeneration

The cleaning process involves injecting Specialist TerraClean fluid directly into the Diesel Particulate Filter. This process will break down the carbon particles enough to be able to pass through the filter and reduce the exhaust back pressure. The engines management will then allow a regeneration again.