Diesel Particular Filter

What is a DPF?

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 management’s ability to regenerate the filter - leading to problems with power loss (see detailed list below) and even in the absolute worst case, risk to the car due to overheating of the filter.

The images bellow show different examples of the DPF, as you can imagine with the first image this is very restrictive and easy to block causing the fault codes and running problems on the car.


A blocked DPF can cause many problems including loss of power, economy and throttle response. With more extreme cases, filters that are extremely blocked filters can cause the engine not to start at all.

Symptoms and Fault Codes:

There are multiple faults codes and symptoms that can point towards a faulty / blocked DPF:


  • Loss of power
  • Lower fuel consumption
  • Reduced throttle response
  • Harder / Fails to Start Limp Mode

Warning Lights:

  • DPF Light (yellow symbol in the top photo)
  • Coil and Engine Management lights


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 2000€ and you could potentially have the same problem further down the line.
  • The second solution is to let us remove the DPF altogether eliminating the problem with no risk of the same problems occurring in the future. The option we have is to cut out the filter itself from the DPF housing, still removing the problem but visually leaving the DPF Housing in its original place for visual inspections. This method can also be carried out at home if you have the correct tools and equipment available.

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About the company

Who‘s behind this


Professional Chip Tuning


Phone: +31 (0) 64261 4813

Vermeerstraat 54

Oudheusden 5156AH, The Netherlands