Did all the hatchback Citroen C5‘s from 2001-2004 have Hydro-pneumatic suspension? If not then do you know which ones did? was there a specific variant or was it just a general option?
I agree completely with the other answer.
Short answer is YES. There were variants of the system which were fitted to different trim levels. The basic models would be fitted with Hydractive 3 suspension whereas the exclusive models (high trim level) were fitted with Hydractive 3+. However, the Peugeot 607 is just a C5 under the skin. It has the same computers, engines, electrics etc but it was fitted with conventional coil spring and shock absorber suspension. I personally prefer the C5's Hydractive suspension as it is far superior at providing a comfortable and smooth ride (watch Top Gear testing the C6 suspension as its the same system) but maybe my preference comes knowing how to fix the system if something goes wrong. I can understand that some people are understandably wary of such a complicated suspension setup.