The light on your particle filter is triggered and you do not know what the malfunction is. The particle filter is mainly found for cars Diesel, even if we find them now for petrol cars. Before you get into repairs for the Citroen Sm, it is necessary to understand where this concern comes from. What is the role of a FAP? Why does the witness go off? What can be the most frequent dysfunctions? In this article, we will give a point by point overview. 
What is a FAP for on your Citroen Sm
As its designation suggests, it is used to filter microscopic molecules toxiques of your engine. These kinds of particles are so small that they easily fit into our body. Note that this is Peugeot who made this FAP. Your catalyst's role is to reduce the level of molecules generated from the engine block, while the FAP collects waste. It therefore seems essential to have a FAP in good condition in case you no longer want the Citroen Sm polluted.
Why the FAP indicator light on your Citroen Sm
The FAP of your Citroen Sm is clogged
Here is the most common malfunction. And this is normal, the FAP becomes blocked as time goes by. The molecules form clusters then block the evacuation of exhaust gases. As a general rule, the FAP in the Citroen Sm can clean itself and therefore expel this waste. However, if this one is particularly old it will have to be changed.
An electronic problem
The concern for the LEDs is that you are by no means certain that there is a malfunction. Indeed, it regularly happens that a warning light is lit while the Citroen Sm is turning perfectly. This FAP has a few electronic sounders which send a signal to the dashboard. When these sounders malfunction when this FAP works properly, it is plausible that the indicator will come on.
What to do if the FAP indicator light on your Citroen Sm lights up?
First, it's completely prohibited to remove the particle filter on your Citroen Sm! It is an offense. You can monitor the sensors to see if they are working properly. Assuming that these work perfectly, the problem must come from the Particle filter. If it turns out to be dirty, you can remove it by driving in the towers for about 10 minutes. Do not climb too much into the towers, this may damage the car. We advise you to drive at 3000 rpm. The vehicle temperature will be able to carbonize the encrusted dirt, and clean this FAP. When this combination does not work, it will have to be replaced by a new one.
Conclusion:
The fap in bad condition should pollute and reduce the power of the vehicle. It is then necessary to have it changed. Write a comment if this article was useful to you. See you soon !