Diesel particulate filters (DPF): know

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Most diesel cars are fitted with a Diesel Particulate Filter (DPF). We explain what it is, why your car needs one and about DPF cleaning

You may have heard people referencing DPFs and ‘DPF’s’ when it comes to diesel cars and wondered what they were doing. Since 2009 onwards, manufacturers started installing DPFs into all diesel cars to reduce harmful particulate pollution since exhaust emissions. Most drivers are still not sure how they operate, how you can say if the DPF is obstructed or how the DPF can be unblocked.

DPFs have to ‘regenerate’ for purposes that are discussed in more detail below in order to prevent blockage, even when they drive for a longer time. DPF regeneration is important in avoiding filter problems; reparation can result in an inconvenient and expensive inspection by a specialist of your vehicle, and in cases that are of serious obstruction the expense of replacing the DPF can be greater than your vehicle is worthwhile.

What’s a filter for DPF?

Owing to the various combustion processes that diesel engines consume fuel, a great deal of soot is produced as a subproduct. It’s the duty of the DPF to catch them and kill them before it can happen. The good, almost invisible material that trigger significant environmental health issues. In 2009, DPFs became mandatory but before that year, some diesel models had been equipped with the technology.

Cleaning of DPF

Although a DPF must first capture and retain harmful particles, it must also be extracted. In a process called DPF regeneration, the DPF exposes them to extremely high temperatures, combusts them and transforms the particles into harmless powder.

Regeneration of DPF and why diesels may be poor for short voyages

The DPF will start regenerating in many ways, but all of them involve intense heat to the exhaust gas – usually about 500 ° C, which is twice as hot as a domestic oven. ‘Passive recycling’ happens when you drive your car for several minutes at speeds above 40 mph, so the particles in the DPF will be periodically burned off.

But many drivers who live in cities, or who drive only short distances, do not get a high enough temperature to allow ‘passive regeneration.’ This can result in soot building, blocking the DPF and leading to motor difficulties such as reduced fuel efficiency. The dashboard can also include a warning light.

The engine is going to try clearing the DPF by ‘active regeneration,’ if you often do not drive at speed. Here the engine allows the exhaust gas to heat up enough to burn off the soot without having to drive the car at speed.

Unfortunately, active regeneration will only take place as the car moves so that city drivers, usually driving in stop-start traffic, may find that their cars can not regenerate DPF actively.

Reparation of DPF

If the DPF light appears, the tool typically has to be cleaned. In order to make it possible, your car guide must instruct you how to drive. You must take the car to a dealer as soon as possible if you follow these instructions and the light is not gone. The jury decides the efficacy of both and the DPF cleaning is the only job left for professionals though DPF cleaners from car repair shops may be bought.

The dealer will use cleaner special DPF items and techniques depending on how badly blocked the DPF is. If this service is not available, ask if the DPF can be deleted and sent to a cleaning specialist company. This operation will cost around £ 100-even though you obviously need to remove the filter from the gar

Excess soot may have destroyed DPF after repair if you are unlucky. If so, it will have to be substituted and the cost of substitution for DPF will amount to £2,000 or more. However it could save you some money to search for an aftermarket DPF.age and renovate it.

Do I have to think about removing DPF?

No. No. Although there are many unscrupulous people who offer to take away the DPF of your car, that is a bad thing. Not only does your vehicle cause needless environmental damage, the MOT check does inevitably fail.

A last word of caution: if you own a diesel engine, make sure you know how to recycle your DPF, so that the alarm light comes on as soon as you can. The blocking can be made worse by stopping the vehicle (which you need to do to test the manual).