depollution failiure?

had loads of trouble like the rest who own peugeots had particulate filter partly blocked and depollution filter faulty done the moterway to try and burn it off used loads of different treatments now depollution failure has come on and car wont start went on you tube found out you can flush your particulate filter out with jet wash Take it of the car first but theres not a lot said about this depollution failure any body no because my head done in.its a 307 1.6 hdi on 55 plate