Got a DPF fault? Is your DPF clogged? Want to avoid expensive replacement fees for your DPF?
Our diagnosis and 2-step cleaning is your best option!
Why does it get clogged up? There are numerous reasons why a DPF may become saturated ranging from incorrect driving habits to failed components such as sensors and EGR valves that must work correctly for the DPF to regenerate (clean itself out). The biggest mistake we see with DPF issues is incorrect or lack of diagnosis and assumption that simply cleaning the filter will resolve the problem. Until a DPF issue is diagnosed there is no point cleaning the filter. We have a great wealth of knowledge and specialise in the diagnostics of DPF systems. Our diagnostics includes live data analysis and manual filter pressure testing.
If required how do we clean the filter? We use a 2-step chemical system that is pressurised in through the DPF pressure sensor pipe directly into the DPF. This means in the majority of instances there is no requirement to remove the DPF for cleaning.
- James Anderson
I had a stage 3 carbon clean a week ago and I would recommend it to anyone!!, I had Tony come out to do the service, he was a nice friendly guy talked me through the process and what to expect, half way through the process he spotted a split in my air intake hose and he said it would also massively impact the performance of the engine. I ordered the part that night and carried on driving it. My mpg went up i normally wouldn’t get over 21 I’m now getting 23 that’s in a week ! I’ve now replaced the air intake hose and wow it’s like a new car + no more black smoke !! I would definitely use them again
Thank you ����
- Barry Williams
Red did a fantastic job on our Golf TDI, cleaning the DPF and running a carbon clean. The car is running better now than ever. When the DPF light came on, I struggled to decide what to do to fix it. The internet is full of contradictory information and people with strong opinions about the best way to clean a DPF, or even if it's possible. Paying for a new unit was never an option and even having the DPF removed for cleaning is prohibitively expensive and means that the car is off the road for days. Luckily I came across UKCC Auto Techs and decided to give Red a call. He was very helpful, friendly and professional on the phone and gave me confidence that he could fix the problem. Even better, he would come to my house and do the job on a Bank Holiday!
Red is such a great guy. He explained the whole process and spent much longer than was expected to make sure that all of the blockage was removed. I took the car for a spin with Red in the passenger seat and he was just as pleased as I was with the car's new-found acceleration. He really does care about doing the job properly and I can't recommend him highly enough.
Salut, Red! �
- Lee Hodkinson
My car Had the treatment today. I was very sceptical it would work? . Thought I would bite the bullet and give it a go. Thanks to red he took me through the whole prossess and kept reassuring me it would work. Well I didn't have much hope tbh. Well it did work just been out in the car and it's more responsive and now goes in gear as it should. Thanks Red will be recommending you to everybody I know cheers pal good work recommended for sure guys. Regards one happy chappy lee
- Simon Hillier
I had my Mercedes SLK carbon cleaned by Ciaran last Saturday and was really impressed! He was old school customer service at its best and went through every single part of the process with me and also took time out to give me some general tips on looking after an older engine. The results where impressive and the car definitely runs much more smoothly now.
Understanding the DPF System
Emissions requirements for new vehicles require Particulate Filters to be fitted to the exhaust of diesel vehicles since the ‘Euro 5’ standards were enforced in 2009. Prior to this many vehicles also have a DPF fitted in anticipation of the change to regulations. This ‘Euro 5’ and beyond standards aim to deliver reductions of >80% in soot (diesel particulates). However, these filtration systems are not without problems causing DPF warning lights, engine limp mode safety activation, reduced efficiency/mpg and poor engine performance.
The diesel particulate filter is mounted as part of the exhaust system. In order for the filter to operate correctly, it must regularly run a regeneration process to burn off the continuously accumulating soot. This process is completed by precisely regulating an increased temperature of the exhaust gas passing through the filter which then burns away the carbon deposits. To do so a sensor transmits data to an engine control unit that then calculates the precise requirement for post-injection fuel to increase the temperature during the regeneration phase. As with any filter, the DPF must be regularly emptied otherwise, over a period of time, it will start to clog up and will eventually become partially blocked. Passive regeneration of the DPF can only occur at fast speeds on a motorway or A-road so with all the local driving and short journeys for many vehicles this process cannot occur often enough eventually leading to clogging of the DPF.
How does the DPF Regeneration process work?
The DPF system is designed in such a way that when the engine is consistently running at approximately 2,500 rpms or more (e.g. on a motorway or fast A-road) the exhaust gas temperatures exceed 350°C soot particles are constantly being burned off without any engine management intervention.
Where the vehicle is predominantly used for urban mileage the exhaust gas temperatures fail to get hot enough passive regeneration is no longer achieved. Therefore soot particles are no longer being burned off so start to accumulate inside the filter. This leads to clogging of the filter and when a threshold is reached the engine’s control unit (ECU) triggers the active regeneration at its next opportunity. The amount of soot accumulated inside the DPF is calculated by the ECU based on:- ‘Driver profile’ – whereby the ECU records the pattern of exhaust gas and oxygen temperature sensor readings and then calculate the degree of saturation, and DPF flow resistance’ – whereby the ECU records signals from sensor regarding flow, temperature and pressure and then calculates of the degree of saturation.
The pressure is measured at both the inlet and outlet of the DPF and the degree of saturation inside the filter is measured by the pressure sensor calculating the difference between the two readings. As the filter becomes clogged the voltage transmitted by the pressure sensor to the ECU rises. At a manufacture set voltage reading the ECU will proceed to raise the temperature of exhaust gas to approximately 600°C thus actively starting the regeneration process. The ECU instructs this increase in temperature by:
- Regulating air flow through the Electronic Throttle Control (ETC).
- Switching the Exhaust Gas Regeneration (EGR) valve so that it recycling exhaust gases thus increasing engine combustion temperature.
- Enforcing a post-injection following the principal injection in order to increase the combustion temperature.
- Enforcing a second post-injection which leads to unburnt fuel evaporating inside the combustion chamber. The unburnt hydrocarbons are oxidised by vapor inside the catalyst converter. During these stage temperatures inside the DPF can reach 620°C.
- The sensor signal, upstream of the DPF, supplies the ECU data to determine the quantity of fuel to be injected during the second post-injection.
When the DPF system has exceeded a set level of saturation it becomes impossible for the vehicle to perform a passive or active regeneration. A mechanic may at this stage attempt what is known as a forced regeneration using a computer to instruct the DPF system to heat up (similar to the active regeneration process) and burn off the excess soot. Depending on the vehicle this will either be done whilst driving or possibly stationary with the engine running and the ecu controlling the RPMS.
Unfortunately all too often forced regenerations will fail or only be beneficial for a short period of time. Why? Simply because either the saturation is too high or the operator has not diagnosed and repaired the fault causing the DPF system to fail the process.
If a forced regeneration fails its common practice you’ll be told a mechanic that a new DPF is required and at huge expense. In most instances this advice, even when it’s from the manufacturer dealers, is inaccurate!
What it more than likely means is the mechanic has reached the limit of their understanding of a very complicated system and therefore assumes the DPF has completely failed. In our experience, this diagnosis is rarely correct. For most replacing the DPF will only resolve the problem short-term, with the fault still present it’s only a matter of time before the new expensive DPF also becomes saturated.
As a preventative measure against clogging of DPF’s we recommend an engine carbon cleaning treatment every 10,000 – 12,000 miles.
If your vehicle has a DPF issue, or has even failed a DPF regeneration by a professional, and therefore requires professional intervention to diagnose and resolve the problem there is no better alternative than a skilled UKCC technician.
Starting at just £89.99 (including dealer level diagnostics, live data reading, and manometer pressure testing) our DPF regeneration (regeneration is not cleaning) and advanced cleaning methods is the least expensive option. The advantages are:-
- Our Mobile Carbon Cleaning Technicians come to you
- Potentially no expensive parts
- No disassembly is required, therefore no expensive labor
- Completed in an average of 2-3 hours so no requirement to leave your vehicle with professionals for days on end
- We are fully insured to complete this service at the roadside or wherever your vehicle is located
If you require further information please visit our DPF Cleaning FAQ’s section, contact your local technician or our HQ team on 01293 769495 to discuss your requirements, or use the inquiry form below and we’ll get back to you at your convenience.
Click on the following links to view our other engine cleaning services – Carbon Cleaning | EGR Valve | Oxygen Sensor | Intake Valves | Spark Plugs | Catalytic Converter | Intake Manifold | Turbocharger | Fuel Injectors | Smoky Exhausts