ive got a 2001/y 2.2 and it came up with the same fault, itookn it it a main dealer not frachise. the told me i needed new fuel pump, regulator and particle filter in the exhaust a total of £1500. itook it to a local garage of citroen trained mechanics he change the electric fuel pump in the tank and topped up the diesel additive (elios) i think thats the write name for it and the fault has slowly gone away hope this helps paul