The DPF (dry filter), or FAP (wet filter) is there to remove soot from the exhaust gas. Particulate filters have been introduced in diesel cars to reduce emissions. If not cleaned properly, the filter can get damaged by ash build-up. This is very likely if you only drive the car in the city and do not achieve greater speeds when using faster roads outside. When you drive fast, the filter can clean itself. If your car has a FAP filter, make sure you put more fuel in the tank; the computer chooses the volume of the special liquid used for soot removal using the FAP filter based on the volume of fuel in the tank so it is best to not just fill it with a few litres when you’re at the station. If the filter does get damaged, you will need to pay a few thousand PLN. In Uk, you can also simply have the filter removed, too. While the solution is costly, it may still bring about savings, compared to replacement or regeneration of damaged filters. Around 150000 people put the wrong fue
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