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WHAT IS DPF REMOVAL?
A Diesel Particulate Filter (or DPF for short) is a filter found in the downpipe section of the exhaust and is specifically designed to reduce the amount of Diesel Particulate Matter (Soot) passing through. The objective of this filter is to create cleaner / more eco friendly exhaust gases being release into the atmosphere.
The purpose of this filter is to reduce pollutants resulting from combustion from being released to the atmosphere...
A diesel particulate filter will gradually become restricted and become more clogged up as a normal part of it's service life, a process called regeneration is designed to occasionally 'clear out' the particulate filter. Unfortunately this needs specific driving conditions and when these are not met, the degree to which the filter is blocked can surpass the engine managements ability to regenerate the filter - leading to problems with power loss and even in the absolute worst case engine failure
DPF REMOVAL
There are two solutions when you experience a blocked DPF. The first solution would be to take the car to the dealership and replace the DPF with a new one. This can cost around £1500 and you could potentially have the same problem further down the line. The second solution is to remove the DPF all together eliminating the problem with no risk of the same problems occurring in the future.
When deleting the DPF in the software we remove all of sensors other than the Pre-Turbo EGT Sensor and Lamba Sensor.
Other companies tend to keep all of the sensors in place and although the some of these sensors are not in use they can cause issues further down the line. If any of these sensors fail it can cause the car to go into limp mode or constantly turn on the fans.
EGR REMOVAL
After deleting the DPF we are also able to delete the EGR Valve, this valve is used to lower the emitions of the car but are often prone for failing. The valve works by recirculating some of the exhaust gases back into the engine through the air intake system, reducing the amount of emitions that exit the car.
The problem lies with the exhaust fumes that contain carbon deposits, these fumes are constantly being recirculated through the engine which over time will cause a build-up of the carbon deposits in the intake manifold and other in other parts including the EGR valve. This build up in the valve is often what causes them to fail.
Once the valve is either removed or blanked off the vehicles ECU will no longer get a signal from the EGR Valve causing the emissions workshop light to appear on the dash board. We can remove this by reprogramming the EGR software on the ECU.
The EGR Valve CANNOT be removed on vehicles that still have the DPF Filter present, doing so would soon block the DPF.