I have recently bought a 159 2.4 diesel.
I had a problem with it going into limp home mode & white/bluish smoke coming out of the exhaust ( which stopped if I re-started the engine ).
The garage I bought it off have replaced the inlet manifold as the valves were coked up ( at great expense! ) and have cleared out the DPF ( and fitted a new sensor to it ).
However the problem is still occuring.....after about 15 miles on the Motorway it starts giving out smoke. There are no warning lights and the engine pulls fine. If I re-start the engine the smoking stops.
It's now been back to the garage 3 times.....any ideas what it could be?
The car is great in all other respects but this is getting me down !