The indicator light on your particle filter is on and you do not know what the problem is. The particle filter is mainly found in cars Diesel, even if we find them today in petrol cars. Before launching into repairs in your smart forfour, it is still important to understand what is causing this concern. What is the role of a particle filter? Why does the light come on? What are the most common concerns? In this text, we will go around the question. 
What is an FAP on your smart forfour
As its designation indicates, its role is to filter microscopic molecules harmful of your engine. These molecules are so tiny that they can be easily inserted through your body. For your information, it is Peugeot who invented this particle filter. The role of the catalyst is to reduce the level of molecules emitted from the engine block, then the particle filter collects the rest. It therefore seems fundamental to have a FAP in good condition if you no longer want your smart forfour to pollute the environment.
Why the FAP indicator lights up on your smart forfour
The FAP of your smart forfour is clogged
This remains the most common problem. No wonder, a particulate filter clogs up as time goes by. Molecules form clusters and then prevent the flow of exhaust gases. As a general rule, the particle filter in your smart forfour should be cleaned automatically and therefore expel the clumps. Unfortunately, if the latter is old it must be replaced.
An electronic problem
The concern with these LEDs is that you are by no means certain that you have a problem. For example, it often happens that an indicator light goes off while your smart forfour is working perfectly. The particle filter has electronic sensors which send a message to the dashboard. When these probes have a problem while the particle filter is working properly, it remains likely that your witness will go off.
What to do if the FAP indicator on your smart forfour lights up?
First, it is completely illegal to remove the particle filter on your vehicle! Indeed, it is punishable by law. You have the option of examining the probes to see if they are working properly. If they work well, the problem comes from the FAP. If the latter turns out to be dirty, it can be repaired by driving at high speed for around ten minutes. Do not accelerate too much either, the process could damage the car. We advise you to drive at 3000 rpm. The heat from the engine block should therefore carbonize the stored soot, thereby freeing your particulate filter. In case this technique does not work, it is necessary to change it.
Conclusion:
The damaged particle filter should pollute as well as decrease acceleration. It therefore remains essential to have it changed. Leave a comment in case our file has helped you. Good road !