I'm a bit of a Citroen Fanboy and have three of them
Citroen Xsara VTS 2.0l 1998 (pre-facelift), right-hand drive (Europe import).
The car generally runs well, but the speedo shows always 30km/h too much. So, when the engine is turned on but the car is not moving it already shows 30km/h. About two years ago, the garage had to grind the rims because the tyres were loosing air and it feels like it happened since them but it also might be a faulty speedo. And finding a new speedo for this very specific model is almost impossible
Citroen C4 by Loeb 1.6l petrol engine (120bhp) 2009
This car always had some issues, like high oil consumption but since a while it feels like it's clogged while accelerating. It feels a bit powerless, especially in gear 4 and 5. The garage guy said the fuel injection could be faulty and the engine isn't getting enough petrol.
Citroen Berlingo Multispace 1.6l diesel engine
The Berlingo usually runs well, but sometimes on the motorway in high gear (5 or 6) it stutters and I always panic the engine could turn off. It only happened once but that was on a steep hill. And it's very unpredictable when it happens, but usually after turning off the engine and turning it on again, it's gone.
I do love my Citroens but I wish I could solve some of the issues