Citroen C4 Picasso 2010 Problems
No car is perfect, but we've gathered everything relating to the Citroen C4 Picasso 2010 reliability here to help you decide if it's a smart buy.
Citroen C4 Picasso tailgate
It would appear the gas is leaking from the struts, and quite rapidly it would seem given that they are in effect running out of gas in 12,000 km. Go back to the dealer and Citroen and try to negotiate a new set of struts under the warranty, or alternatively have the struts regassed independently. I suggest the latter would probably fix your problem.