More for preventitive maintenance than as a solution for a blocked DPF. Very good for keeping the system clean before blockage occurs. Application can be carried out by us or you can buy the product to take away to install yourself.
On Car Process
Chemical applied to Filter Surface
High Pressure Applied
Chemical forced through Filter
Computer Applied Regeneration
Our most popular option as it can be completed within one day, doesn't involve as much dismantling and is therefore cheaper than the off car process.
Off Car Soak
Removal of DPF (inc housing)
Soak in Chemical Vat
3-5hrs depending on condition
High Pressure Applied
Reinstallation of DPF
Computer Applied Regeneration
Our most comprehensive package provides the most thorough clean but the removal and installation adds labour time & usually takes two days.
Chemical Product Guarantees
As New Condition Restored
The chemicals used for the On Car & Off Car DPF Cleaning process are guaranteed to restore the filter to as new cleanliness.
The filter will be up to 100% cleaner than at the start of the process. What the chemicals cannot guarantee is that the filter will remain clean and unblocked.
The longevity and success of the chemical clean will depend on whether the cause of the original blockage was identified and addressed.
The fuel tank additives offer little that is conclusive in relation to warranties although there are many promises on the marketing that the additive will work wonders.
We treat all chemical clean processes as "guaranteed to clean the filter but not warrantied to remain clean". We require you to sign a disclaimer stating that you understand the process and results prior to commencement of the clean.
Advantages & Disadvantages
Cheaper than Renewal or Removal
Not A Modification of Car
No Roadworthiness Implications
Less Harmful Emissions Maintained
Usually a One Day Process
DPF can Reblock
Longevity of Clean Unwarrantied
Not a Longterm solution
May Require Other Works too
More Information on DPF Chemical Cleaning
DPF Chemical Cleaning
Please note that we only offer DPF Repair solutions where we have carried out our DPF Diagnostics first.
This is because we take customer satisfaction seriously & cannot guarantee satisfaction if we haven't checked that the repairs will actually solve the problem!
If we do repairs diagnosis is FREE so you won't get any additional charges if your existing diagnosis is correct. If it's wrong you'll save the cost of an ineffective treatment & only get charged £55.
After the diagnosis process you would have received a report along with estimates for the repairs. In this case, DPF Chemical Cleaning. You will have decided which type from above you want us to carry out & accepted the estimated costs. We will then raise the new jobsheet from the accepted estimate. The likelihood is you will have to leave the car & if we have a courtesy vehicle available you will be offered its usage. The chemical cleaning can take 8hrs or more.
Computer Activated Regen
The regeneration process involves the filter heating up to the correct temperature for the burning of particulate. The vehicle usually completes the regeneration under load and the process may last for 20 - 30 mins. The regeneration cycle must not be interrupted or it is logged as a failed process. Using our specialist tooling (usually manufacturer specific for most brands) we can activate a DPF regen, this is essential following a chemical clean.
The final part of the process before you get your car back is the paperwork. After the chemical clean and computer activated regen, the vehicle is taken for a reasonable test drive on a route where different speeds and load requirements can be attained to test the operation fully. Once satisfied the technician signs the job off as complete. A senior technician will complete a final QC check prior to the customer service advisors receiving the completed paperwork.
Does DPF Cleaning Work?
Yes but only IF it's done properly!
A high quality top of the range chemical product applied accurately and directly through the whole filter will always work provided the DPF hasn't started to collapse (hence the borescope check first!).
Even cars with DPFs so blocked that the car couldn't start or run have been able to be sucessfully cleaned in our workshop.
Keeping Your DPF Clean
There are ways to get the optimum lifespan and effeciency from your diesel particulate filter. If you're going to the expense of getting the filter cleaned or renewed, the last thing you want is to be back in the same position anytime soon.
We are big fans of preventative maintenance and the best way to keep the system in optimum condition is to keep your engine well maintained with clean oil regularly. Ask your servicing workshop to check for carbon build up with your annual service and if there's any deposits present have a decoke and additive treatment before it gets worse. Use premium fuel every third tank of fuel, the extra additives actually do make a difference and keep the fuel system clean.
1 in 3
Use Premium Fuel Every 3rd Tank
12k or 1yr
Traditional Oil Change Intervals
Consider Carbon Treatment Checks
BiAnnual Additive Treatments
When diagnosing a DPF problem we may identify other faults with the system that have caused the blockage, such as a sensor or upstream failure such as EGR Valve faults. When we prepare the report and estimates for the most appropriate solution, we will include estimates for any other repairs required. Failure to do these may result in the DPF blocking up again in a short period of time or excessive emissions in the case of removal. Please heed our advice, we aren't out to rip you off, we just know what we're talking about and what will cause further problems.
For best practice we would always recommend having an oil flush and filter renewal with DPF Repairs.
A DPF becoming blocked causes the system to continously attempt regeneration (up until the filter reaches maximum capacity for regen) which involves injecting additional diesel through the system.
This tends to contaminate the oil, hence the recommendation to flush the oil and renew the filter.
From £65 (Avg 4cyl car)
Intake System Decoking
An unfortunate side effect of DPF problems tends to be intake system carbon buildup.
Basically the soot and carbon deposits from the diesel system coke up the intake pipes, manifolds, egr valves etc etc. The volume of soot and carbon is much increased once the DPF becomes blocked and inefficient.
We offer multiple intake system decarb options, you'll receive more information from your customer service advisor.
From £95 (Most Cars)
Intake System Leaks
One of the main causes we find for DPF and carbon problems is an undetected intake system leak.
A small split in a pipe may not cause sufficient deviation from expected values for a MAF fault code to trigger, however it will be having an effect on the carbon build up and subsequent DPF status.
We offer a Smoke Pro Plus leak detector test which will highlight any intake system leaks.
From £25 (Basic Check)
EGR Valve Actuators
Exhaust Gas Recirculation basically recirculates a portion of exhaust gases back into the engine cylinders.
The valve is controlled by either a vacuum based or an electronic actuator valve which opens or closes to admit the exhaust under certain conditions. EGR Valve actuators stuck open or closed cause DPF issues.
EGR Valve cleaning can help, alternatively a new part may be required.
From £125 (Ultrasonic Cleaning)
EGR Valve Blanking
EGR Valves can be unreliable and cause problems and as they are a quite expensive part it has become popular under certain circumstances to blank the valve and bypass it from the system.
Mechanical blanking off is required and an engine ECU map adjustment to maintain emission standards.
There are pros & cons to all modifications, request an info pack or ask about this.
From £295 (Full Process)
Swirl Flap Blanking
Swirl Flaps are small butterly valves fitted to the intake manifold just before the cylinder head intake ports and operated with either a vacuum based or electronic servo mechanism.
Carbon build up on the flaps cause them to stick in one position and strain the system. Flaps can break & get sucked though the engine causing catastrophic failure.
Swirl Flap Bypass is therefore very popular as a precaution.
From £165 (Full Process)
Mass Air Flow Faults
The MAF sensor is used to measure the mass flow rate of air entering the engine.
The purpose of this is for the engine control unit to calculate the correct fuel mass. This means that if the mass air flow sensor or associated pipes have a fault, the engine will over or under fuel. This tends to increase carbon build up.
MAF faults need resolving.
From £55 (Diagnosis)
The multitude of sensors on the intake and exhaust system are all linked to the whole system running correctly.
Any sensor faults can trigger error codes & poor running. Even minor inefficiencies or variations can cause carbon build up or inoperation of the DPF regeneration process. A sure way to get a blocked DPF.
Sensor faults need identifying.
From £55 (Diagnosis)
The injectors obviously inject the fuel entering the engine.
If an injector develops a fault the engine will be over or under fuelling. Not only is this bad for the cylinders but it will also lead to increased carbonisation and soot build up. Injector bench testing tends to be the best way of confirming injector status.
Injector cleaning is popular.
From £15 (Per Injecter Test)
Turbo Actuator Issues
The turbo actuator (also known as wastegate actuator) is responsible for controlling the boost output from the turbo by providing a pressure release valve diverting the gases away from the turbine wheel.
Pressure & heat are a recipe for wear & tear. The actuator spring will weaken & allow premature opening or the diagphram could fail.
An EML will likely illuminate, always get this checked!
From £55 (Diagnosis)
The turbocharger works hard and if a problem does develop it would be wise not to ignore it!
Turbochargers get carbonised just like the rest of the system and a Turbo ChemClean will do wonders as a preventative maintenance routine. Keeping the turbine clean definitely increases longevity.
We offer Turbo ChemCleaning or in worse case scenarios replacement of the turbocharger.
From £65 (Turbo ChemClean)
All engines produce carbon as a side effect of the engine combustion process. Carbon Buildup Causes All Sorts of Problems!
Unfortunately not all of the carbon gets emitted via the exhaust system (to be filtered by the DPF), with modern recircularisation systems carbon deposits build up in the intake system. Decarbonisation prevents bigger issues.
We offer Additive Treatments, Chemical Cleaning & Walnut Blasting.
From £95 (ChemCleaning)
Frequently Asked Questions
Good Old FAQs; if we've missed something you want to know - just get in touch
Let's be clear - the cleaning process is guaranteed in that the filter will 100% be clean but there is no warranty for how long the filter will remain clean! A blockage could reoccur if the problem is due to driving style or an unidentified underlying fault.
Yes. Chemical cleaning done properly following an accurate diagnostic process is very effective plus it lacks all of the unpleasant disadvantages of removal and the significant cost implications of renewal.