My Citroen ds4 has had a warning light show up saying risk of diesel particulate filter blockage and the service light has now stopped on,does anyone know how to solve this problem or is it a trip to Citroen main dealers?
Take it for a drive on a dual carriage way leave it in third or fourth gear to keep the revs around 3000 for twenty minuets or so, this will keep the temperature high enough clear the filter.
Do not leave it with the warning on otherwise it will go into limp mode.
If you only do short journeys do a dual carriage way run as I suggested on a regular basis as a preventative measure.
Hope it works for you, there is information in the handbook regarding this.