This has become a big and expensive problem for Norwegian cars

But some things you can do to avoid it.

If we turn the time back only a few years, there were cars with diesel engines that were applicable. Whether you bought big, SUV or a small car – so the diesel engine was the only one. Diesel was in more than 75 percent of all cars sold in Norway.

Since then, this has changed, both fast and much. But there are still many diesel cars on Norwegian roads and new cars are being sold every day, if not in the same amount as before.

Common to most of these cars is that they are equipped with a soot filter (DPF) mounted on the exhaust system. The task of this filter is to remove soot and other particles from the combustion, thereby reducing the emission of health and environmental pollution.

High exhaust temperature is important

But it is with this filter as with many other filters. It can become tight.

However, this must be self-cleaning. It works as the filter cleans itself by burning the collected particles. For this to happen, the exhaust temperature must be high, which means that the car must be driven on a longer trip at high speed or at high load, such as a long steep slope.

Simple sketch that shows how harmful particles are collected in the filter.

Simple sketch that shows how harmful particles are collected in the filter.

While driving, the car's control unit checks for some cars, but not at all – the amount of soot collected in the filter. If this exceeds a certain value, usually 45 percent, the car tries to burn the soot. If this does not happen because the trips are too short, standing in line or with a lot of start / stop, the lamp will light up as in the image above.

Then there is a risk of fermentation and the filter comes close. Then you should make a good journey with high tension as quickly as possible and try to burn the collected particles that have collected. It is very important.

Also read: this is a break in your car


If this does not happen, it is possible that the car is in "emergency mode". This will reduce power and peak speed. The car then only tries to survive & # 39; & # 39; by reducing the combustion and thereby the number of soot particles that flows through the filter. If this happens, you should go to the nearest dealer who can try a forced cleaning process by running the diagnostic device, but not all cars have this option.

If the car does not have this option, the filter is tight and there is only one solution to the problem. Namely the switching of filter. This filter is closed. This means that you can not change anything, open it or clean it in any way. It must be replaced quickly. Something that can be anything but a cheap pleasure. Prices of between 20,000 and 30,000 are more often than unusual for such a job.

On some cars these are now available as "pirate parts" at lower prices.

Such a filter is actually designed to carry the car, but with Norwegian riding patterns, topography, climate and not least winter, this is a challenge. Many small rides, kayaking, many cold starts, especially in winter but also in summer (a car is not hot until it is 80 degrees …) is anything but favorable for this cleaning system.

AdBlue: here you have to be careful, otherwise you have problems …

Exhaust systems on newer cars are advanced and expensive. It used to be easier with just one tube and two silencers …

Exhaust systems on newer cars are advanced and expensive. It used to be easier with just one tube and two silencers …

Think of the driving pattern

This is probably a very special Norwegian problem in many ways. Here on the mountain we stroll around for short journeys in 20 min degrees and with an average speed of 38 km / h. In a country like Germany, where it is often easily and quickly controlled, they do not understand what we mean when we talk about clogged soot filters. They have barely heard of the problem.

However, some long-distance / high-speed strips occasionally reduce the problem and the frequency of dense filters.

Whether a dense particle filter falls under the warranty / guarantee of the car has been the subject of more than one heated discussion. More will be. There is really nothing wrong with the car – the use that is wrong is a recurring argument.

"Have you sold me a car that can not be used in Norway with a normal Norwegian pattern, is often contradicted.

Anyway, it's smart to be aware of this if you already have a diesel car. If you are considering buying a new or used diesel car, you may want to do an extra round in the "Thinking Box" and view the driving pattern before shopping. There are still petrol cars if you do not want an electric car.

Read also: 5 things that make a lot of mistakes in the heat

Bargain heavy on purchase of diesel and petrol cars – fast charging of electric cars & # 39; s more expensive than diesel filling

This case was first published in

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