My Citroen Xsara had been running fine even up until last night. Today it just won't start, brand new battery 3 weeks ago. Turns over but just won't fire, getting diesel upto the injectors. Even with easystart it tries to fire but won't run. AA been out and left scratching their head. Maybe imobiliser problem although light not on on dash and keyfob works fine. Also mentioned it could be the cam sensor. Computer records 300 bar at fuel rail and rpm ok. Could this be heater plugs or would it have started with easystart if this was the case? It's driving me mad any help appreciated.