Hi Everybody I have had a C5 2.2 HDI estate for about 3 years. The first time the antipollution fault appeared it was due to the lift pump in the tank packing up. Then it did it again about 8 months later, the brushes disintergrated because the fuel filter was black, but this one got raplaced under waranty. The next antipollution fault was due to the AIR FILTER FILLING UP WITH WATER and damaging the air flow sensor. BE AWARE OF THIS ONE CHECK YOUR AIR FILTER FOR ANY MOISTURE IN THE AIR BOX the garage did drill a hole in the bottom of the air box to  stop the accumilation of water  but it hasn`t  stopped the fault because it appeared tonight and the  air filter is soaking wet so has anybody suffered this one?   andyc22