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Thanks Paul H, I checked the Citroen website and found no replaceable items outside of the pump assy. I spoke to an independant Citroen dealer and subsequently booked the car in for him to have a look at, with the end result that he replaced the hydraulic pump with a new item he had in stock. and it has fixed the problem. The price of the pump from him was a third of the price of the same item from a main dealer. The independent dealer is Mark Allen, and he is in county Wexford, Eire, he also has a significant cache of spare parts, new and secondhand.

Thanks Coastline, but I thought the latest C5 X7 had an electrical anti sink valve within the pump control unit? I stand to be corrected though!!. If it has a mechanical/electrical one separate from the unit, where will it be located?

Thanks for the reply, I'm not confident that the garage has the correct diagnosis, they seem very unsure of the whole Hydraulic suspension setup. I am aware that if I fit one it will need setting up by Lexia, hoping to buy one soon itf I can figure out which one will suit a 2010 C5

An update to this problem, the car spent some 2 days in a Citroen dealership, and after changing a "notchy" rear ride height sender they gave it back to me, but the problem persisted, another 2 days last week and they have diagnosed one of the electrovalves is passing fluid within the hydraulic control unit. They wanted to replace the unit, but I stopped them as its a massive cost (€1141+ VAT + fitting) Can this unit be repaired? rather than replaced. Thanks

Thanks for the replies The height adjusters in the centre console work correctly, also the one in the boot (its a tourer), I thought that buy exercising the suspension through the settings it might resolve it, but no. What I can't understand is why does it stay up after I unlock the doors after it has sagged. if there is an anti sink valve in the system then it should work all the time, not selectively.

2010 C5 X7 2.0 HDI 160BHP. have owned this car for some 8 months with few problems, we went away for 6 weeks, I tried to start it on our return, but the battery was in need of a charge, I disconnected the positive lead and charged the battery. Once charged and on reconnecting the positive lead there was a loud crack (electrical crack) from around the suspension pump. The car rose as normal and worked fine for a day or so. Since then it has dropped at the rear every time I leave it. Prior to this the car remained level at all times. The car now will sit up at the rear occasionally as if the rear is drooping whilst driving, its a bit disconcerting to say the least. I booked it in with a dealer who diagnosed poor battery performance, so I replaced that and the garage "told" the car that a new one had been fitted, but they noted a few electrical voltage faults related to the suspension. They have just cleared them - and the car still drops. Interestingly, once the rear has dropped if I unlock the car, it will return to normal height, lock the car - and it will stay there all night. Could the big relay by the suspension pump be at fault, or something more expensive. Anyone have any clues. TIA