Hi, I am having an issue with economy mode with my 1.6HDI 2008 C5 too. When I get in the car, it comes up with economy mode active straight away, every time. I have just rang Citroen who tell me its a known issue which can be resolved with a software update that will cost me £90 +VAT!!!!!! Im trying to get it sorted with a warranty that I paid for with the car, but they are saying its not a fault its just an issue that does stop the car from working..... not impressed!