Diesel Particulate Filters

Diesel particulate filters (DPFs) help diesel engines run cleaner by collecting and disposing of exhaust soot, a nasty byproduct of diesel combustion.

The filters have been mandatory for all diesel engines since the 2009 Euro 5 Exhaust Emissions legislation. Although they help the environment, diesel particulate filters can prove expensive. A broken or clogged filter can cost thousands of pounds to replace.

The filters are constantly being cleaned through a process called “regeneration.” This can either be active, passive, or forced, as the accumulated soot is burned off at extremely high temperatures (~600°C), leaving only an ashy residue behind.

Active systems employ sensors that control fuel injection. By doing so, they can increase exhaust temperatures when necessary, initiating the burning of soot and regenerating the particulate filter.

Passive systems rely on motorway driving where exhaust temperatures are naturally higher to burn off soot. This system can prove problematic, as city driving and short trips can limit regeneration opportunities, leading to a clogged diesel particulate filter.

Forced regeneration occurs in garages, where a mechanic will run a computer program in the car to initiate DPF regeneration. This can be a costly procedure that will also require the owner to change the engine oil and oil filter.

 

Diesel particulate filter cost

Have a problem with your DPF? Need a complete DPF filter replacement? Looking for a garage with the lowest DPF cleaning cost?

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Diesel Particulate Filters

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