The particulate filter warning light has just come on on my 2.2hdi 406, accompanied by a nice message telling me "Diesel antipollution system defective". Does anyone know exactly what this means ? e.g. the catalyst tank is empty, there is a significant pressure difference either side of the DPF or... ? I have about 500 miles to drive before I can reasonably get it to a dealer - is this going to damage anything ? Thanks! Steve