Hi,
I've just bought 2005 C5 2.2 HDI, and still getting used to it...
Always wanted one of these cars, even though I knew upfront I'll be facing FAP, EGR, MAF, etc fault and stuff...
Yesterday I cleaned the MAF sensor with a proper spray, it is ok now, doesn't show fault any more.
I am using bluetooth OBD2 with OBD Car Doctor Pro for Android... and these days I'm erasing fault codes, but they come back again, erase them again, come back again,... etc