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What is a diesel particulate filter (DPF)

What is a diesel particulate filter (DPF) - blog post image

Disabling a Diesel Particulate Filtering

DPF`s was first considered in the 1970s due to concerns regarding the impacts of inhaled particulates. Particulate filters have been in use on non-road machines since 1980, and in automobiles since 1985. medium and heavy-duty diesel engine emissions were not regulated until 1987 when the first California Heavy Truck rule was introduced capping particulate emissions at 0.60 g/BHP Hour. Since then, progressively tighter standards have been introduced for light- and heavy-duty roadgoing diesel-powered vehicles and for off-road diesel engines. Similar regulations have also been adopted by the European Union and some individual European countries, most Asian countries, and the rest of North and South America.

Unlike a catalytic converter which is a flow-through device, a DPF retains bigger exhaust gas particles by forcing the gas to flow through the filter; however, the DPF does not retain small particles and maintenance-free DPFs break larger particles into smaller ones. There are a variety of diesel particulate filter technologies on the market. Each is designed around similar requirements:

  • Fine filtration
  • Minimum pressure drop
  • Low cost
  • Mass production suitability
  • Product durability

If you decide to just remove the filter, the vehicle will automatically produce a warning fault.


Is it illegal to remove the DPF? Yes in certain countries (you should check with your local authority)


Auto Code can reprogram your ECU to safely disable your DPF system. All fault code data will be erased and your ECU will be ready to plug in. You can then remove the filter and put a straight through pipe in. It is recommended to leave the sensors in place.

The DPF system is turned off using the latest main dealer diagnostic software and can easily be re-enabled if need be in the future.


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