Have an 05 plate Picasso 2.0 HDi with exactly same problem, took it to a garage for a diagnosis, turns out its a faulty valve which can only be repaired by Citreon....
Iain
March 2011
We have had the same problem for 5 years with ours. In short there is no engine fault! After lots and lots of expensive investigations it turns out there is a very minute air bubble in the system which would be really, really expensive to resolve but doesn't actually affect the performance of the car. Basically the electronics on a Citreon is a great big pile of horse sh** and once you unlucky enough to own one of these cars that get a phantom 'engine fault' you are stuck with it because you will never find a buyer for it!!
brewster
January 2010
i have the same problem any one got any idears what it wrong with it
fang
January 2010
i have the same problem engine warning light came on today anybody got any idears 2.0 picasso petrol on a 54 plate
shaun
January 2010
I can answer this question...
my citroen picasso is showing engine fault on 54 plate?